Caterpillarwheel tractor-scraperwheel tractor
Caterpillar 623
Maintenance schedule, common problems & OEM parts breakdown
The Caterpillar 623 is a self-loading wheel tractor-scraper engineered for high-productivity earthmoving, hauling, and grading. This machine class utilizes an elevating scraper bowl with a heaped capacity of 23 yd³ (17.6 m³) and a rated payload of approximately 55,200 lb (25,038 kg). Depending on the specific series, such as the C13-powered configurations, the machine operates with a net flywheel power of 304 kW (4/407 hp). The 623 is offered in various configurations to manage medium to long-distance material transport across construction and mining applications.
Evolution across the 623 series has focused on integrating advanced technologies like APECS for engine-transmission communication and the Payload Estimator for real-time weighing. Modern iterations feature significant cab improvements, including a 21% larger workspace compared to previous G Series models. In today's used market, the 623 remains a critical asset due to its robust powertrain and the availability of high-quality replacement components. Its ability to maintain high travel speeds while loaded makes it a preferred choice for fleet managers looking to balance operational cost per ton with heavy-duty performance.
Below: full specifications, fluids & capacities, the factory service schedule, common service parts, verified fault codes, what owners discuss, attachment guidance, the complete assembly directory, and a serial-number reference. Complete parts lists with full OEM part numbers, exploded diagrams, quantities, and fitment data are available free in Heavy Parts AI.
Caterpillar 623 specifications
Engine
| Model | Cat C13 (ACERT variant noted for 623K) |
| Flywheel Power | 304 kW (407 hp) |
| Rated Engine RPM | 2000 r/min |
| Emissions Tier | Varies by configuration: U.S. EPA Tier 4 Final/EU Stage IV (623K); U.S. EPA Tier 3/EU Stage IIIA (standard 623) |
Weights
| Operating Weight - Empty | 88,061 lb (39,937 kg) |
| Rated Load | 25,038 kg (55,200 lb); 25.1 tonnes (27.6 tons) |
Dimensions
| Overall Length | 45.18 ft (13.77 m) |
| Overall Width | 11.71 ft (3.57 m) |
| Overall Shipping Height | 12.37 ft (3.77 m) / 158.9 in (4037 mm) |
| Width - Tractor | 133.1 in (3381 mm) |
| Width - Inside of Bowl | 120 in (3048 mm) |
| Width - Outside Rear Tires | 128.9 in (3275 mm) |
| Wheelbase | 329.5 in (8370 mm) / 27.46 ft |
| Ground Clearance - Tractor | 21.9 in (557 mm) |
| Maximum Depth of Cut | 10.3 in (262 mm) |
| Maximum Depth of Spread | 18.3 in (465 mm) |
Performance
| Top Speed - Loaded | 33.5 mph (53.9 km/h) |
| Transmission Gear - First | 3.1 mph (5 km/h) |
| Transmission Gear - Eighth | 33.5 mph (53.9 km/h) |
| Scraper Capacity - Heaped | 23 yd³ (17.6 m³) |
| Scraper Capacity - Struck | 18.8 yd³ (14.4 m³) |
| Bowl Lower Time | 3.5 s |
| Ejector Extend Time | 6.45 s |
Service capacities (summary)
| Fuel Tank | 216.09 gal (818 l) |
| Crankcase | 8.08 gal (30.58 l) |
| Cooling System | 11.89 gal (45 l) |
| Hydraulic System | 21.926 gal (83 l) |
| Transmission System | 24.76 gal (93 l) |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
623 fluids & capacities
| System | Capacity | Recommended fluid |
|---|---|---|
| Engine Crankcase | 30.58 l (8.08 US gal) | Cat DEO; SAE 15W-40 or SAE 10W-30 |
| Cooling System | 45 l (11.89 US gal) | Cat ELC (50/50 Premix) |
| Fuel Tank | 818 l (216.09 US gal) | Not specified |
| Transmission System | 93 l (24.76 US gal) | Cat TDTO; SAE 10W, SAE 30, or SAE 50 |
| Hydraulic System | 83 l (21.926 US gal) | Cat HYDO Advanced 10 or 30; use 30 for hot climates |
| Grease | Not specified | Cat Multipurpose, Advanced 3Moly, Ultra 5Moly, Desert Gold, Arctic Platinum, High Speed Ball Bearing, White Assembly, or Hammer Paste |
Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.
Caterpillar 623 maintenance schedule
| Service interval | Tasks |
|---|---|
| Every 10 h |
|
| Every 250 h |
|
| Every 500 h |
|
| Every 1,000 h |
|
| Every 2,000 h |
|
Servicing the 623 beyond the schedule
Predictive Maintenance & Fluid Analysis
Utilize Cat S.O.S Services to monitor engine oil, hydraulic fluid, and transmission oil for wear metals like iron or copper. Regular analysis detects early signs of pump failure or gear degradation. Monitor coolant pH and SCA levels to prevent liner pitting. For the C13 engine, tracking fuel dilution and soot loading is essential to protect piston and ring integrity during heavy-duty cycles.
Corrective & Common Repairs
Address hydraulic filter restrictions immediately to prevent damage to pumps and valves. Monitor the elevator drive sprocket and chain for excessive wear, as improved tensioning systems are designed to extend chain life. Inspect the scraper bowl cutting edges and ejector cylinders for leaks or structural fatigue. Ensure all wet disc brakes are functioning correctly to prevent loss of deceleration capability during loaded hauls.
Overhaul & Rebuild Points
Plan major component evaluations at 2,000-hour intervals. Focus on the transmission system and hydraulic oil replacement to maintain system pressure and efficiency. Inspect the turbocharger and engine air cleaner elements for deep-seated contamination. When rebuilding, evaluate the structural integrity of the hitch and bowl sides, ensuring that draft-arm overflow guards are intact to prevent material from interfering with the chassis.
Seasonal & Environment Servicing
In dusty or quarry environments, increase air filter inspections to a daily frequency and clean radiator fins daily to prevent overheating. During cold starts in low-temperature regions, utilize the Auto-Stall feature to bring the transmission to operating temperature quickly. For machines operating in high-moisture areas, prioritize fuel water separator draining and check for moisture ingress in the electrical system and battery terminals.
623 common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 1S-8648 | Fuel Filter | Fuel system service | Check fitment → |
| 1S-5132 | Oil Filter Assembly | Lubrication service | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
623 fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| 110-0 | Engine Coolant Temperature — Above Normal | Low coolant level, thermostat failure | Inspect cooling system, refill coolant, test thermostat |
| 110-3 | Engine Coolant Temp Sensor — Voltage High | Open circuit, sensor failure | Check wiring; replace sensor if confirmed faulty |
| 174-3 | Engine Fuel Temperature — Voltage Above Normal | Open circuit in sensor wiring | Inspect harness and replace sensor if necessary |
| 190-8 | Engine Speed — Abnormal Frequency | Speed sensor air gap, sensor failure, tone ring damage | Check sensor gap; test speed sensor and tone ring |
| 41-3 | 8-Volt DC Supply — Voltage Above Normal | Short to power on 8V reference circuit | Inspect sensors sharing the 8V supply and isolate fault |
| 41-4 | 8-Volt DC Supply — Voltage Below Normal | Short to ground on 8V reference circuit | Disconnect sensors one at a time to locate short |
| 2348-9 | SAE J1939 Data Link #2 — Abnormal Update Rate | CAN bus wiring damage, termination fault | Check CAN wiring and measure termination resistance |
| E360 | Engine Coolant Temperature — High | Low coolant, failed thermostat, water pump issue | Diagnose cooling system; do not operate until resolved |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
623 attachments & work tools
Technology & Automation Attachments
Includes Sequence Assist to reduce operator commands, Load Assist for easier operation, and Cat Grade Control for intelligent cutting and filling. Product Link™ is available for remote machine data collection via web or mobile applications.
Vision & Monitoring Systems
Work Area Vision System (WAVS) provides three-camera coverage of the right side, cutting edge, and rear area. Cat Payload Estimator achieves on-the-go weighing by monitoring bowl lift cylinder pressure.
Operator Comfort & Access Attachments
Optional powered access ladder system is available for easier cab entry. High-pressure steering systems are used to reduce operator effort during maneuvers.
Environmental & Cooling Arrangements
High ambient cooling (HRC) arrangements are available for specific operating environments. The tractor features a hydraulic on-demand fan to assist in lower fuel consumption.
Mounting & Structural Components
The machine utilizes an advanced cushion hitch designed to manage end stroke events and reduce maintenance. Draft-arm overflow guards are used to divert material away from the bowl sides.
All 623 assemblies by section
Every catalogued assembly group for the Caterpillar 623. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Attachments
7d2400 Alternator Arrangement--24 Volt, 50 Ampere
| 5D***49 | Harness; -- Dash To Terminal Strip On L.H. Radiator Support | 1 |
| 5D***52 | Wiring Group | 1 |
| 7D***78 | Harness; --Terminal Strip On L.H. Radiator Support To Alternator And Lights | 1 |
9s3182 Alternator Group--24 Volt, 50 Ampere
| 9S***82 | Alternator Group | 1 |
5s9088 Alternator Assembly--Part 1 Of 2--Type 2
| 5S***88 | Alternator Group-Charging | 1 |
5s9088 Alternator Assembly--Part 2 Of 2--Type 2
| 5S***88 | Alternator Group-Charging | 1 |
5s9088 Alternator Assembly--Part 1 Of 2--Type 1
| 5S***88 | Alternator Group-Charging | 1 |
5s9088 Alternator Assembly--Part 2 Of 2--Type 1
| 5S***88 | Alternator Group-Charging | 1 |
9j281 Back-Up Warning Arrangement--Factory Installation
| 9D***05 | Gauge Group | 1 |
| 9J***35 | Back-Up Warning Group | 1 |
| 9J***81 | Back-Up Warning Arrangement | 1 |
9j235 Back-Up Warning Group
| 9J***35 | Back-Up Warning Group | 1 |
8d4805 Back-Up Warning Group
| 8D***05 | Back-Up Warning Group | 1 |
8j1929 Basic Valve Group
| 8J***29 | Basic Valve Group | 1 |
2p6209 Blower Fan Group
| 2P***09 | Blower Fan Group | 1 |
9d5710 Cab Door Group--Type 2
| 9D***10 | Cab Door Group | 1 |
9d5710 Cab Door Group--Type 3
| 9D***10 | Cab Door Group | 1 |
9d5710 Cab Door Group - Type 1
| 9D***10 | Cab Door Group | 1 |
2s6096 Protection Cover Group--Radiator Cap
| 2S***96 | Cover Group-Protection; Protection Cover Group-- Radiator Cap | 1 |
2s3025 Protection Cover Group--Oil Filler Cap
| 2S***25 | Cover Group-Protection; Protection Cover Group | 1 |
5d1910 Protection Cover Group--Hydraulic Tank Cap
| 5D***10 | Cover Group-Protection; Protection Cover Group Hydraulic Tank Cap | 1 |
9d630 Dust Cover Group
| 9D***30 | Cover-Dust | 1 |
6d8070 Differential Case And Covers Group--Part 1 Of 2--Type 2
| 6D***70 | Differential Case And Covers | 1 |
6d8070 Differential Case And Covers Group--Part 2 Of 2--Type 2
| 6D***70 | Differential Case And Covers | 1 |
6d8070 Differential Case And Covers Group--Part 2 Of 2--Type 1
| 6D***70 | Differential Case And Covers | 1 |
6d8070 Differential Case And Covers Group--Part 1 Of 2--Type 1
| 6D***70 | Differential Case And Covers | 1 |
9d380 Emergency Start Receptacle Group--Type 2
| 9D***80 | Emergency Start Receptacle Group | 1 |
9d380 Emergency Start Receptacle Group--Type 1
| 9D***80 | Emergency Start Receptacle Group | 1 |
7d3810 Emergency Start Receptacle Group
| 7D***10 | Emergency Start Receptacle Group | 1 |
5d2856 Defroster Fan Group--24 Volt
| 5D***56 | Fan Group-Defrosting | 1 |
9d7290 Field Rework Guard Group
| 9D***07 | Rod 35" Long | 3 |
| 9D***08 | Rod 32.36" Long | 1 |
| 9D***90 | Field Rework Guard Group | 1 |
8d650 Frame And Case Group--Part 2 Of 2--Type 2--Factory Installation
| 8D***50 | Frame And Case Group | 1 |
8d650 Frame And Case Group--Part 1 Of 2--Type 3--Factory Installation
| 8D***50 | Frame And Case Group | 1 |
8d650 Frame And Case Group--Part 2 Of 2--Type 1--Factory Installation
| 8D***50 | Frame And Case Group | 1 |
8d3190 Frame And Case Group--Part 1 Of 2--Type 2--Factory Installation
| 8D***90 | Frame And Case Group | 1 |
8d3190 Frame And Case Group--Part 2 Of 2--Type 3--Factory Installation
| 8D***90 | Frame And Case Group | 1 |
8d650 Frame And Case Group--Part 2 Of 2--Type 3--Factory Installation
| 8D***50 | Frame And Case Group | 1 |
8d3190 Frame And Case Group--Part 1 Of 2--Type 1--Factory Installation
| 8D***90 | Frame And Case Group | 1 |
8d3190 Frame And Case Group--Part 2 Of 2--Type 1--Factory Installation
| 8D***90 | Frame And Case Group | 1 |
8d3190 Frame And Case Group--Part 1 Of 2--Type 3--Factory Installation
| 8D***90 | Frame And Case Group | 1 |
8d3190 Frame And Case Group--Part 2 Of 2--Type 2--Factory Installation
| 8D***90 | Frame And Case Group | 1 |
8d650 Frame And Case Group--Part 1 Of 2--Type 2--Factory Installation
| 8D***50 | Frame And Case Group | 1 |
8d650 Frame And Case Group--Part 1 Of 2--Type 1--Factory Installation
| 8D***50 | Frame And Case Group | 1 |
7d4690 Fast Fill Fuel Adapter Group
| 7D***90 | Fuel Tank Adapter Group | 1 |
7d6000 Fast Fill Fuel Adapter Group
| 7D***00 | Fuel Tank Adapter Group | 1 |
7d6000 Fast Fill Fuel Adapter Group--Type 2
| 7D***00 | Fuel Tank Adapter Group | 1 |
7d6000 Fast Fill Fuel Adapter Group--Type 3
| 7D***00 | Fuel Tank Adapter Group | 1 |
8d8145 Vandalism Guard Group
| 8D***45 | Guard Group-Vandalism; Vandalism Guard Group | 1 |
5j3170 Hitch And Steering Group--Part 2 Of 2--Type 1
| 5J***70 | Hitch And Steering | 1 |
5j3170 Hitch And Steering Group--Part 1 Of 2--Type 1
| 5J***70 | Hitch And Steering | 1 |
5j3170 Hitch And Steering Group--Part 2 Of 2--Type 2
| 5J***70 | Hitch And Steering | 1 |
5j3170 Hitch And Steering Group--Part 1 Of 2--Type 2
| 5J***70 | Hitch And Steering | 1 |
Hitch And Steering (8j5086 N/S)
| 5J***26 | Cylinder Group-Steering | 2 |
| 5J***70 | Hitch And Steering | 1 |
| 8J***33 | Steering Lines Group | 1 |
5d9440 Hood Side Door Group--Right Hand--Type 2
| 5D***40 | Hood Side Door Group | 1 |
5d9440 Hood Side Door Group--Right Hand - Type 1
| 5D***40 | Hood Side Door Group | 1 |
5d6238 Link Group
| 5D***38 | Link Group | 1 |
8d3175 Mounting And Cylinder Group
| 8D***75 | Mounting And Cylinder Group | 1 |
8s6763 Muffler Group
| 8S***63 | Muffler Group | 1 |
Name Plates And Transfers
| 1S***88 | Film-- Drain Valve; --On Each Side Of Radiator Support | 1 |
| 1S***12 | Plate; Transportation Notice Below Cab Door Sil Near L.H. Side Of Platform Support | 1 |
| 2D***80 | Plate; Serial Number On R.H. Side Of Cylinder Block | 2 |
8d2420 Hitch, Steering And Hydraulic Arrangement
| 5D***70 | Steering Gear | 1 |
| 8D***20 | Non-Cushion Hitch, Steering And Hydraulic Arrangement | 1 |
| 8D***00 | Tractor To Scraper Lines Group | 1 |
8d2420 Non-Cushion Hitch, Steering And Hydraulic Arrangement
| 5D***70 | Steering Gear | 1 |
| 6D***70 | Differential Case And Covers | 1 |
| 8D***20 | Non-Cushion Hitch, Steering And Hydraulic Arrangement | 1 |
8d8680 Parking Brake Control Arrangement--Factory Installation
| 8D***60 | Parking Brake Control Group | 1 |
| 8D***80 | Parking Brake Control Arrangement | 1 |
| 8J***57 | Parking Brake Control Group | 1 |
8d9010 Parking Brake Control Arrangement--Factory Installation
| 7D***80 | Parking Brake Control Group | 1 |
| 8D***10 | Parking Brake Control Arrangement | 1 |
| 8J***57 | Parking Brake Control Group | 1 |
7d4180 Parking Brake Control Group--Part 1 Of 2--Type 1
| 7D***80 | Parking Brake Control Group | 1 |
8d8660 Parking Brake Control Group--Part 1 Of 2
| 8D***60 | Parking Brake Control Group | 1 |
8d8660 Parking Brake Control Group--Part 2 Of 2
| 8D***60 | Parking Brake Control Group | 1 |
8j7757 Parking Brake Control Group--Type 1
| 8J***57 | Parking Brake Control Group | 1 |
8j7757 Parking Brake Control Group--Type 2
| 8J***57 | Parking Brake Control Group | 1 |
7d4180 Parking Brake Control Group--Part 2 Of 2--Type 2
| 7D***80 | Parking Brake Control Group | 1 |
7d4180 Parking Brake Control Group--Part 1 Of 2--Type 2
| 7D***80 | Parking Brake Control Group | 1 |
7d4180 Parking Brake Control Group--Part 2 Of 2--Type 1
| 7D***80 | Parking Brake Control Group | 1 |
2g600 Power Source Seat Conversion Group
| 06***21 | Adapter, Str., 1/4in. N.P.T. F. X 1/4in. J.I.C. M. | 1 |
| 1D***38 | Bolt-Top Tank,Bottom Tank To Accessory | 2 |
| 1D***07 | Bolt Bracket To Starting Engine Timing Gear Housing | 4 |
9j6514 Pressure Reducing Valve Assembly
| 9J***14 | Pressure Reducing Valve Assembly | 1 |
5d1920 Protection Cover Group--Fuel Tank Cap
| 5D***20 | Protection Cover Group-Fuel Tank Cap; Protection Cover Group | 1 |
2d284 Rear Flood Light Group--24 Volt
| 2D***84 | Rear Flood Light Group | 1 |
6d7110 Retarder Arrangement
| 1H***02 | Ring; -- To Tube Assembly | 4 |
| 2S***03 | Gasket; - Cover To Cylinder Head | 2 |
| 2S***04 | Gasket | 1 |
8d9695 Retarder Arrangement--Factory Installation
| 1H***02 | Ring; -- To Tube Assembly | 4 |
| 2S***03 | Gasket; - Cover To Cylinder Head | 2 |
| 2S***04 | Gasket | 1 |
6d7100 Retarder Control And Lines Group--Part 2 Of 2
| 6D***00 | Retarder Control And Lines Group | 1 |
8d9685 Retarder And Control Lines Group--Type 3
| 8D***85 | Retarder Control And Lines Group | 1 |
8d9685 Retarder And Control Lines Group--Type 2
| 8D***85 | Retarder Control And Lines Group | 1 |
8d9685 Retarder Control And Lines Group-Type 1
| 8D***85 | Retarder Control And Lines Group | 1 |
6d7100 Retarder Control And Lines Group--Part 1 Of 2
| 6D***00 | Retarder Control And Lines Group | 1 |
9s5228 Retarder Group
| 9S***28 | Retarder Group | 1 |
2s534 Retarder Oil Cooler Group
| 2S***34 | Retarder Oil Cooler Group | 1 |
9d3290 Roll-Over Protective Structure Conversion Group--Enclosed--Part 3 Of 3
| 0L***51 | Bolt Starting Engine Fuel Tank Bracket To Diesel Intake Manifold | 2 |
| 0S***94 | Bolt (1 In. Long 3/8 In. Dia.); Plate Assembly To Support Assembly | 2 |
| 3B***06 | Washer,Lock; Flange,Elbow,Clamp Assembly,Tube To Pump,Tube Assembly To Screen,Clip Mounting,And Tube Assembly To Transmission | 2 |
9d3290 Roll-Over Protective Structure Conversion Group--Enclosed--Part 2 Of 3
| 1F***48 | Nut 12.70 mm(.50 In.) Thread | 1 |
| 1L***77 | Button-- Fuel Tank Hole In Hood | 1 |
| 2P***81 | Film-Hydraulic Retarder; (Hydraulic. Retarder) | 1 |
9d3290 Roll-Over Protective Structure Conversion Group Enclosed--Part 1 Of 3
| 1B***03 | Nut Exhaust Pipe To Starting Engine Cylinder Block | 1 |
| 1B***30 | Nut-- Flame Arrestor Or Adapter To Pipe Assembly | 2 |
| 2A***62 | Screw,Cap,Hexagon H Diode Pig Tail To Grd; (1/4-20x.625 In) | 12 |
9d2340 Roll-Over Protective Structure Group--Noise Suppressed--
| 9D***40 | Roll-Over Protective Structure Group | 1 |
8d8720 Roll-Over Protective Structure Group
| 8D***20 | Roll-Over Protective Structure Group | 1 |
9d2340 Roll-Over Protective Structure Group--Noise Suppressed--Part 1 Of 3--Type 1
| 9D***40 | Roll-Over Protective Structure Group | 1 |
9d1050 Roll-Over Protective Structure Mounting Group--Field Installation
| 9D***50 | Roll-Over Protective Structure Mounting Group | 1 |
8d8721 Roll-Over Protective System--Enclosed--Field
| 8D***21 | Roll-Over Protective System | 1 |
8d8721 Roll-Over Protective Structure--Enclosed--Part 1 Of 3--Type 2
| 8D***21 | Roll-Over Protective System | 1 |
8d8721 Roll-Over Protective Structure--Enclosed--Part 2 Of 3--Type 2
| 8D***21 | Roll-Over Protective System | 1 |
8d8721 Roll-Over Protective Structure--Enclosed--Part 3 Of 3--Type 2
| 8D***21 | Roll-Over Protective System | 1 |
9d640 Roll-Over Protective System--Field Installation
| 9D***40 | Roll-Over Protective System | 1 |
8d9763 Roll-Over Protective System--Enclosed
| 8D***63 | Rops Group-Enclosed | 1 |
8j9038 Rotochamber Assembly
| 8J***38 | Rotochamber As | 1 |
6d5217 Rotochamber Assembly
| 6D***17 | Rotochamber Assembly | 1 |
9d2510 Seat Group
| 9D***10 | Seat Group | 1 |
8d8920 Seat Group--Type 2
| 8D***20 | Seat Group | 1 |
8d8930 Seat Group
| 8D***30 | Seat Group | 1 |
8d8920 Seat Group
| 8D***20 | Seat Group | 1 |
8d8920 Seat Group - Type 1
| 8D***20 | Seat Group | 1 |
9k682 Shaft And Link Assembly
| 9K***82 | Shaft & Link As | 1 |
5d6370 Steering Gear Group--Part 2 Of 3--Type 2
| 5D***70 | Steering Gear | 1 |
5d6370 Steering Gear Group--Part 1 Of 3--Type 3
| 5D***70 | Steering Gear | 1 |
5d6370 Steering Gear Group--Part 2 Of 3--Type 3
| 5D***70 | Steering Gear | 1 |
5d6370 Steering Gear Group--Part 2 Of 3-Type 1
| 5D***70 | Steering Gear | 1 |
5d6370 Steering Gear Group--Part 1 Of 3-Type 1
| 5D***70 | Steering Gear | 1 |
5d6370 Steering Gear Group--Part 3 Of 3--Type 2
| 5D***70 | Steering Gear | 1 |
5d6370 Steering Gear Group--Part 3 Of 3--Type 3
| 5D***70 | Steering Gear | 1 |
5d6370 Steering Gear Group--Part 3 Of 3-Type 1
| 5D***70 | Steering Gear | 1 |
5d6370 Steering Gear Group--Part 1 Of 3--Type 2
| 5D***70 | Steering Gear | 1 |
8d3210 Steering Lines Group--Part 1 Of 2
| 8D***10 | Steering Lines Group | 1 |
8d3210 Steering Lines Group--Part 2 Of 2
| 8D***10 | Steering Lines Group | 1 |
8j2386 Steering Valve Group
| 8J***86 | Steering Valve Group | 1 |
8d3100 Tractor To Scraper Lines Group--Part 1 Of 5
| 8D***00 | Tractor To Scraper Lines Group | 1 |
8d3100 Tractor To Scraper Lines Group--Part 2 Of 5
| 8D***00 | Tractor To Scraper Lines Group | 1 |
8d3100 Tractor To Scraper Lines Group--Part 5 Of 5
| 8D***00 | Tractor To Scraper Lines Group | 1 |
8d3100 Tractor To Scraper Lines Group--Part 4 Of 5
| 8D***00 | Tractor To Scraper Lines Group | 1 |
8d3100 Tractor To Scraper Lines Group--Part 3 Of 5
| 8D***00 | Tractor To Scraper Lines Group | 1 |
2p5870 Transmission Case Assembly
| 2P***70 | Transmission Case Assembly | 1 |
6d3782 Emergency Control Valve Assembly
| 6D***82 | Valve As; -- Emergency Control | 1 |
6d3943 Retarder Valve Assembly
| 6D***43 | Valve As | 1 |
2r618 Double Check Valve Assembly
| 2R***18 | Valve As-Check | 1 |
2g9000 Fast Fill Adapter Group
| 2G***00 | Valve As-Tank | 1 |
6d3781 Double Check Valve Group--Type 1
| 6D***81 | Valve Group-Check; -Service Brake Diverter-Retarder Control | 1 |
6d3781 Double Check Valve Group--Type 2
| 6D***81 | Valve Group-Check; -Service Brake Diverter-Retarder Control | 1 |
2p5802 Retarder Control Group--Type 3
| 2P***02 | Valve Group-Retarder Control | 1 |
2p5802 Retarder Control Group - Type 1
| 2P***02 | Valve Group-Retarder Control | 1 |
2p5802 Retarder Control Group--Type 2
| 2P***02 | Valve Group-Retarder Control | 1 |
7d4710 Vandalism Guard Group--Instrument Panel--Type 2
| 7D***10 | Vandalism Protection Group; Vandalism Guard Group | 1 |
7d4710 Vandalism Guard Group--Instrument Panel--Type 1
| 7D***10 | Vandalism Protection Group; Vandalism Guard Group | 1 |
6d9750 Windshield Wiper Group--24 Volt--Type 2
| 6D***50 | Windshield Wiper Group | 1 |
6d9750 Windshield Wiper Group--24 Volt--Type 1
| 6D***50 | Windshield Wiper Group | 1 |
8d1452 Wiper Group--24 Volt
| 8D***52 | Windshield Wiper Group | 1 |
1v3079 Basic Wiper Group--24 Volt
| 1V***79 | Wiper Group | 1 |
1v4358 Basic Wiper Group--24 Volt
| 1V***58 | Wiper Group; Basic Wiper Group | 1 |
Diesel Engine
Aftercooler Air Lines (5s618 N/S)
| 5S***18 | Aftercooler Air Lines | 1 |
Air Aftercooler (2p8826 N/S)
| 2P***26 | Air Aftercooler | 1 |
Air Cleaner (5d5970 N/S)
| 5D***70 | Air Cleaner | 1 |
Air Compressor (1s8672 N/S)
| 1S***72 | Air Compressor | 1 |
1p5013 Air Compressor Group--Type 2
| 1P***13 | Air Compressor Group | 1 |
1p5013 Air Compressor Group - Type 1
| 1P***13 | Air Compressor Group | 1 |
7m914 Air Filter Service Indicator Group
| 7M***14 | Air Filter Service Indicator Group | 1 |
Alternator (1p4031 N/S)--24 Volt, 19 Ampere
| 1P***31 | Alternator | 1 |
2p1204 Alternator Group
| 2P***04 | Alternator Group | 1 |
Balancer (7s6282 N/S)
| 7S***82 | Balancer | 1 |
Battery, Wiring And Lighting (5d6050 N/S)--24 Volt--Part 2 Of 2
| 5D***50 | Battery, Wiring And Lighting Group | 1 |
Battery, Wiring And Lighting (5d6050 N/S)--24 Volt--Part 1 Of 2
| 5D***50 | Battery, Wiring And Lighting Group | 1 |
Belt Tightener (1s8668 N/S)
| 1S***68 | Belt Tightener | 1 |
Breather And Oil Filler (2s6723 N/S)
| 2S***23 | Breather And Oil Filler | 1 |
Camshaft (5s6393 N/S)--Part 2 Of 2
| 5S***93 | Camshaft | 1 |
Camshaft (5s6393 N/S)--Part 1 Of 2
| 5S***93 | Camshaft | 1 |
Camshaft Drive (1s9900 N/S)
| 1S***00 | Camshaft Drive | 1 |
Connecting Rod And Piston (1s8643 N/S)--8 Required
| 1S***43 | Connecting Rod And Piston | 1 |
Crankshaft (5s555 N/S)
| 5S***55 | Crankshaft | 1 |
Crankshaft Bearing Replacement Groups
Cylinder Block And Covers (7s8288 N/S)--Front View--Part 2 Of 3
| 7S***88 | Cylinder Block And Covers | 1 |
Cylinder Block And Covers (7s8288 N/S)--Rear View--Part 3 Of 3
| 7S***88 | Cylinder Block And Covers | 1 |
Cylinder Block And Covers (7s8288 N/S)--Side View--Part 1 Of 3
| 7S***88 | Cylinder Block And Covers | 1 |
Cylinder Block Assembly (7s501 N/S)
| 7S***01 | Cylinder Block Assembly | 1 |
Cylinder Head And Valve Mechanism (7s2520 N/S)
| 7S***20 | Cylinder Head And Valve Mechanism | 1 |
Drive Pulley And Damper (1s8638 N/S)
| 1S***38 | Drive Pulley And Damper | 1 |
1s8658 Electric Starter Group--24 Volt
| 1S***58 | Electric Starter Group | 1 |
3s8473 Electric Starting Motor Assembly--24 Volt--Part 3 Of 3
| 3S***73 | Electric Starting Motor Assembly | 1 |
3s8473 Electric Starting Motor Assembly--24 Volt--Part 2 Of 3
| 3S***73 | Electric Starting Motor Assembly | 1 |
3s8473 Electric Starting Motor Assembly--24 Volt--Part 1 Of 3
| 3S***73 | Electric Starting Motor Assembly | 1 |
4n6884 Engine Support Group
| 4N***84 | Engine Support Group | 1 |
1s8661 Engine Support Group
| 1S***61 | Engine Support Group | 1 |
Exhaust Extension (7m8829 N/S)
| 7M***29 | Exhaust Extension | 1 |
Fan Drive (2s8206 N/S)
| 2S***06 | Fan Drive | 1 |
8h7204 Fuel Filter Group
| 8H***04 | Filter Group-Fuel | 1 |
Flywheel (1s8639 N/S)
| 1S***39 | Flywheel | 1 |
Fuel Filter (1s8648 N/S)
| 1S***48 | Fuel Filter | 1 |
Fuel Injection Valves And Lines (1s8650 N/S)
| 1S***50 | Fuel Injection Valves And Lines | 1 |
Fuel Priming Pump (1s8664 N/S)
| 1S***64 | Fuel Priming Pump | 1 |
Fuel Pump Housing And Governor (5s2978 N/S)
| 5S***78 | Fuel Pump Housing And Governor | 1 |
3s9620 Fuel Pump Housing Group--Part 1 Of 2 - Type 1
| 3S***20 | Fuel Pump Housing Group | 1 |
3s9620 Fuel Pump Housing Group--Part 2 Of 2 - Type 1
| 3S***20 | Fuel Pump Housing Group | 1 |
3s9620 Fuel Pump Housing Group--Part 2 Of 2--Type 2
| 3S***20 | Fuel Pump Housing Group | 1 |
3s9620 Fuel Pump Housing Group--Part 1 Of 2--Type 2
| 3S***20 | Fuel Pump Housing Group | 1 |
8s5389 Fuel Ratio Control Group--Type 1
| 8S***89 | Fuel Ratio Control Group | 1 |
8s5389 Fuel Ratio Control Group--Type 2
| 8S***89 | Fuel Ratio Control Group | 1 |
Fuel Ratio Override Control (6d8220 N/S)--Top View
| 6D***20 | Fuel Ratio Override Control | 1 |
4s5661 Fuel Transfer Pump Group
| 4S***61 | Fuel Transfer Pump Group | 1 |
Fumes Disposal (3s5143 N/S)
| 3S***43 | Fumes Disposal | 1 |
Gasket Kits
| 1P***42 | Transmission Pump And Lines Overhaul | 0 |
| 1P***44 | Transfer Gear (Output) Overhaul | 0 |
| 5P***19 | Complete Engine Overhaul | 0 |
6d7530 Gauge Group
| 6D***30 | Gauges | 1 |
1s8659 Glow Plug And Wiring Group--24 Volt
| 1S***59 | Glow Plug And Wiring Group | 1 |
Governor Control (8d8855 N/S)
| 8D***55 | Governor Control | 1 |
Governor Control (6d8290 N/S)
| 6D***90 | Governor Control | 1 |
8s5390 Governor Group--Part 2 Of 2 - Type 1
| 8S***90 | Governor Group | 1 |
8s5390 Governor Group--Part 1 Of 2--Type 2
| 8S***90 | Governor Group | 1 |
8s5390 Governor Group--Part 1 Of 2--Type 3
| 8S***90 | Governor Group | 1 |
8s5390 Governor Group--Part 2 Of 2--Type 3
| 8S***90 | Governor Group | 1 |
8s5390 Governor Group--Part 2 Of 2--Type 2
| 8S***90 | Governor Group | 1 |
8s5390 Governor Group--Part 1 Of 2 - Type 1
| 8S***90 | Governor Group | 1 |
5s2621 Torque Spring Group--Type 2
| 5S***21 | Governor Torque Spring Group | 1 |
5s2621 Torque Spring Group--Type 1
| 5S***21 | Governor Torque Spring Group | 1 |
8d8647 Harness Assembly
| 8D***47 | Harness Assembly | 1 |
Hydraulic Oil Cooler (2p6502 N/S)
| 2P***02 | Hydraulic Oil Cooler | 1 |
1m3379 Head Lamp Assembly--24 Volt--Type 1
| 1M***79 | Lamp Group | 1 |
1m3387 Dash Lamp Assembly--24 Volt
| 1M***87 | Lamp Group | 1 |
1m1882 Flood Lamp Assembly--24 Volt
| 1M***82 | Lamp Group | 1 |
1m3379 Head Lamp Assembly--24 Volt--Type 2
| 1M***79 | Lamp Group | 1 |
Manifolds (5s6392 N/S)--Part 1 Of 2
| 5S***92 | Manifolds | 1 |
Manifolds (5s6392 N/S)--Part 2 Of 2
| 5S***92 | Manifolds | 1 |
Muffler (4n3973 N/S)
| 4N***73 | Muffler | 1 |
1s5132 Oil Filter Assembly
| 1S***32 | Oil Filter Assembly | 1 |
Oil Lines (2s4412 N/S)
| 2S***12 | Oil Lines | 1 |
Oil Pump And Drive (1s8653 N/S)
| 1S***53 | Oil Pump And Drive | 1 |
1s9523 Oil Pump Assembly
| 1S***23 | Oil Pump Assembly | 1 |
2s5651 Precleaner Assembly
| 2S***51 | Precleaner As; -Air Cleaner | 1 |
Primary Fuel Filter And Lines (1s8649 N/S)
| 1S***49 | Primary Fuel Filter And Lines | 1 |
2s308 Fuel Priming Pump Assembly
| 2S***08 | Pump As-Fuel Priming | 1 |
Radiator (2p8830 N/S)--Rear View-Part 1 Of 2
| 2P***30 | Radiator | 1 |
Radiator (2p8830 N/S)--Side View-Part 2 Of 2
| 2P***30 | Radiator | 1 |
Radiator Guard And Support (6d8340 N/S)
| 6D***40 | Radiator Guard And Support | 1 |
Service Meter And Tachometer Drive (3s7238 N/S)
| 3S***38 | Service Meter And Tachometer Drive | 1 |
3s7229 Service Meter Group
| 3S***29 | Service Meter Group | 1 |
2p3926 Electric Starting Motor Group--24 Volt--Part 2 Of 3
| 2P***26 | Starting Motor Group-Electric | 1 |
2p3926 Electric Starting Motor Group--24 Volt--Part 3 Of 3
| 2P***26 | Starting Motor Group-Electric | 1 |
2p3926 Electric Starting Motor Group--24 Volt--Part 1 Of 3
| 2P***26 | Starting Motor Group-Electric | 1 |
Suction Fan (2p6151 N/S)
| 2P***51 | Suction Fan | 1 |
7h7290 Disconnect Switch Assembly
| 7H***90 | Switch As-Disconnect | 1 |
6n5123 Solenoid Switch Assembly--24 Volt
| 6N***23 | Switch As-Solenoid | 1 |
4m1812 Solenoid Switch Assembly
| 4M***12 | Switch As-Solenoid | 1 |
3s7230 Tachometer Drive Group
| 3S***30 | Tachometer Drive Group | 1 |
5s2728 Turbocharger Assembly
| 5S***28 | Turbocharger Assembly | 1 |
5s2713 Turbocharger Group
| 5S***13 | Turbocharger Group | 1 |
4s9412 Variable Timing Drive Assembly
| 4S***12 | Variable Timing Drive Group | 1 |
Water Lines, Torque Converter & Engine Oil Cooler (5s6390 N/S)
| 5S***90 | Water Lines Torque Converter And Engine Oil Cooler | 1 |
5s1912 Water Pump Assembly (2s4587 N/S)
| 5S***12 | Water Pump Assembly | 1 |
Wiring Diagram--24 Volt System
7d9307 Wiring Harness Assembly
| 7D***07 | Wiring Harness Assembly | 1 |
Transmission And Chassis
8j6323 Accumulator Group
| 8J***23 | Accumulator Group | 1 |
5d5810 Air Cylinder Group
| 5D***10 | Air Cylinder Group | 1 |
Air Lines, Brake And Horn Controls (6d8410 N/S)
| 6D***10 | Air Lines Brake And Horn Controls | 1 |
Air Tanks, And Lines--Part 2 Of 2
Air Tanks And Lines--Part 1 Of 2
Air Tank And Lines--Part 2 Of 2
Air Tanks, Valve Assemblies And Lines
5s7778 Automatic Power Shift Transmission Arrangement
| 5S***78 | Automatic Power Shift Transmission Arrangement | 1 |
9s2822 Automatic Selector Valve Group
| 9S***22 | Automatic Selector Valve Group | 1 |
5d3640 Brake Valve Assembly
| 5D***40 | Brake Valve Assembly | 1 |
Bumper (5d5870 N/S)--Part 1 Of 2
| 5D***70 | Bumper | 1 |
Bumper (5d5870 N/S)--Part 2 Of 2
| 5D***70 | Bumper | 1 |
3g2836 Cartridge Group--38 Gpm
| 3G***36 | Cartridge Group | 1 |
3g2234 Cartridge Group--60 Gpm
| 3G***34 | Cartridge Group; (Front) | 1 |
9j427 Control Valve Group--Part 1 Of 2--Type 1
| 9J***27 | Control Valve Group | 1 |
8j4478 Control Valve Group--Part 1 Of 2
| 8J***78 | Control Valve Group | 1 |
9j427 Control Valve Group--Part 2 Of 2-Type 1
| 9J***27 | Control Valve Group | 1 |
9j427 Control Valve Group--Part 2 Of 2--Type 2
| 9J***27 | Control Valve Group | 1 |
8j4478 Control Valve Group--Part 2 Of 2
| 8J***78 | Control Valve Group | 1 |
9j427 Control Valve Group--Part 1 Of 2--Type 2
| 9J***27 | Control Valve Group | 1 |
9s5195 Coupling Group
| 9S***95 | Coupling Group | 1 |
Crankcase Guard (6d8310 N/S)
| 6D***10 | Crankcase Guard | 1 |
Cushion Hitch (8j9781 N/S)--Part 1 Of 2
| 8J***81 | Cushion Hitch | 1 |
Cushion Hitch (8j9781 N/S)--Part 2 Of 2
| 8J***81 | Cushion Hitch | 1 |
Cushion Hitch Lines (7d8650 N/S)--Part 2 Of 2
Cushion Hitch Lines (7d8650 N/S)--Part 1 Of 2
| 7D***50 | Cushion Hitch Lines | 1 |
Cushion Hitch Lines (7j9582 N/S)
8j9329 Control Valve Group--Part 2 Of 2
| 8J***29 | Cushion Hitch Valve Group | 1 |
8j9329 Control Valve Group--Part 1 Of 2
| 8J***29 | Cushion Hitch Valve Group | 1 |
Cushion Hitch Valve (7j9350 N/S)--Part 1 Of 2
| 7J***50 | Cushion Hitch Valve Group | 1 |
Cushion Hitch Valve Group (7j9350 N/S)--Part 2 Of 2
| 7J***50 | Cushion Hitch Valve Group | 1 |
5j1326 Steering Cylinder Group--5" Bore X 31.70" Stroke--2 Required
| 5J***26 | Cylinder Group-Steering | 1 |
Differential And Bevel Gear (5d5620 N/S)--Part 2 Of 2
| 5D***20 | Differential And Bevel Gear | 1 |
Differential And Bevel Gear (5d5620 N/S)--Part 1 Of 2
| 5D***20 | Differential And Bevel Gear | 1 |
8d180 Differential Group
| 8D***80 | Differential Group | 1 |
Drive Shaft (5d6125 N/S)
| 5D***25 | Drive Shaft | 1 |
5d6030 Drive Shaft Guards Group
| 5D***30 | Drive Shaft Guards Group | 1 |
9j3454 Elevator Lock Group--Field Installation
| 9J***54 | Elevator Lock Group | 1 |
Emergency Brake Control (7d4170 N/S)--Part 2 Of 2
| 7D***70 | Emergency Brake Control | 1 |
Emergency Brake Control (7d4170 N/S)--Part 1 Of 2
| 7D***70 | Emergency Brake Control | 1 |
Fenders (8d2340 N/S)
| 8D***40 | Fenders | 1 |
2s6457 Transmission Filter Group
| 2S***57 | Filter Group-Transmission; (Transmission) | 1 |
Final Drive And Wheels (6d6990 N/S)--29.50 X 29 Tubeless Tires
| 6D***90 | Final Drive And Wheels | 1 |
Frame And Case (8d9985 N/S)--Part 1 Of 2
| 8D***85 | Frame And Case | 1 |
Frame And Case (8s9985 N/S)--Part 2 Of 2
| 8D***85 | Frame And Case | 1 |
Frame And Case (8d9985 N/S)--Part 2 Of 2
| 8D***85 | Frame And Case | 1 |
Fuel Oil Tank (8d1750 N/S)--120 U.S. Gallon
| 8D***50 | Fuel Oil Tank | 1 |
8s6340 Governor Group
| 8S***40 | Governor Group | 1 |
Hitch And Steering (6j1938 N/S)--Part 2 Of 2
| 6J***38 | Hitch And Steering | 1 |
Hitch And Steering (6j1938 N/S)--Part 1 Of 2
| 6J***38 | Hitch And Steering | 1 |
Hood (8d8390 N/S)
5d6060 Hood Group
| 5D***60 | Hood And Exhaust Extension | 1 |
5d6998 Pneuphonic Horn Assembly
| 5D***98 | Horn Group-Air | 1 |
Hydraulic Expansion Tank (8d1910 N/S)
| 8D***10 | Hydraulic Expansion Tank | 1 |
8d1610 Hydraulic Tank And Filter Group--Part 1 Of 2
| 8D***10 | Hydraulic Tank And Filter Group | 1 |
8d1610 Hydraulic Tank And Filter Group--Part 2 Of 2
| 8D***10 | Hydraulic Tank And Filter Group | 1 |
1t970 Hydraulic Torque Converter Group
| 1T***70 | Hydraulic Torque Converter Group | 1 |
8j3582 Internal Filter Group--Type 2
| 8J***82 | Internal Filter Group | 1 |
8j3582 Internal Filter Group--Type 1
| 8J***82 | Internal Filter Group | 1 |
8j3582 Internal Filter Group--Type 3
| 8J***82 | Internal Filter Group | 1 |
8j204 Load Cylinder Group--5.5" Bore X 10" Stroke
| 8J***04 | Load Cylinder Group | 1 |
8j7398 Main Relief Valve Group
Manifold And Screens (2s6472 N/S)
| 2S***72 | Manifold And Screens Group | 1 |
2s6472 Manifold And Screen Group--Type 2
| 2S***72 | Manifold And Screens Group | 1 |
2s6472 Manifold And Screens Group--Type 1
| 2S***72 | Manifold And Screens Group | 1 |
7j9348 Valve Group
| 7J***48 | Pilot Valve Group | 1 |
Planetary Transmission (3s150 N/S)--Part 2 Of 4
| 3S***50 | Planetary Transmission | 1 |
Planetary Transmission (3s150 N/S)--Part 3 Of 4
| 3S***50 | Planetary Transmission | 1 |
Planetary Transmission (3s150 N/S)--Part 2 Of 4--Type 1
| 3S***50 | Planetary Transmission | 1 |
3s150 Planetary Transmission Group--Part 1 Of 4--Type 2
| 3S***50 | Planetary Transmission | 1 |
3s150 Planetary Transmission Group--Part 4 Of 4--Type 2
| 3S***50 | Planetary Transmission | 1 |
Planetary Transmission (3s150 N/S)--Part 1 Of 4
| 3S***50 | Planetary Transmission | 1 |
Planetary Transmission (3s150 N/S)--Part 4 Of 4--Type 1
| 3S***50 | Planetary Transmission | 1 |
Planetary Transmission (3s150 N/S)--Part 3 Of 4--Type 1
| 3S***50 | Planetary Transmission | 1 |
3s150 Planetary Transmission Group--Part 3 Of 4--Type 2
| 3S***50 | Planetary Transmission | 1 |
Planetary Transmission (3s150 N/S)--Part 4 Of 4
| 3S***50 | Planetary Transmission | 1 |
3s150 Planetary Transmission Group--Part 2 Of 4--Type 4
| 3S***50 | Planetary Transmission | 1 |
Planetary Transmission (3s150 N/S)--Part 1 Of 4 - Type 1
| 3S***50 | Planetary Transmission | 1 |
Pneuphonic Horn Assembly, Horn Valve And Lines
Pneuphonic Horn Assembly, Horn Valve And Lines--As Viewed From Left Hand Side Of Machine
Pneuphonic Horn Assembly, Valve Assemblies And Lines--As Viewed From Front Left Hand Side Of Machine
1p3236 Pressure Control Group
| 1P***36 | Pressure Control Group | 1 |
9j5503 Pressure Reducing Valve Assembly
| 9J***03 | Pressure Reducing Valve Assembly | 1 |
Gear Pump (8d1995 N/S)
| 8D***95 | Pump Group-Gear 1 Ho | 1 |
2s7850 Scavenge Pump Group
| 2S***50 | Pump Group-Scavenge; -Flywheel Scavenge | 1 |
4f6941 Release Valve Assembly
| 4F***41 | Release Valve Assembly | 1 |
3d2119 Rotochambers Group
| 3D***19 | Rotochamber | 1 |
Rotochambers, Valve Assemblies And Lines
Safety Tread (8d2390 N/S)
| 8D***90 | Safety Tread | 1 |
7s8595 Scavenge Pump Group
| 7S***95 | Scavenge Pump Group | 1 |
Seat Frame And Platform (8d9020 N/S)--Part 1 Of 3
| 8D***20 | Seat Frame And Platform | 1 |
Seat Frame And Platform (8d9020 N/S)--Part 3 Of 3
| 8D***20 | Seat Frame And Platform | 1 |
Seat Frame And Platform (6d7580 N/S)--Part 2 Of 3
| 6D***80 | Seat Frame And Platform | 1 |
Seat Frame And Platform (8d9020 N/S)--Part 2 Of 3
| 8D***20 | Seat Frame And Platform | 1 |
Seat Frame And Platform (6d7580 N/S)--Part 1 Of 3
| 6D***80 | Seat Frame And Platform | 1 |
Seat Frame And Platform (6d7580 N/S)--Part 3 Of 3
| 6D***80 | Seat Frame And Platform | 1 |
8d9925 Seat Group
| 8D***25 | Seat Group | 1 |
7d2269 Seat Suspension Assembly
| 7D***69 | Seat Suspension Assembly | 1 |
7s6937 Selector Valve Group
| 7S***37 | Selector Valve Group | 1 |
8j7344 Selector Valve Group
| 8J***44 | Selector Valve Group | 1 |
5j8606 Steering Cylinder Group (Change 0-5)--1.5" Bore X 9.38" Stroke
| 5J***06 | Servo-Master Steering Cylinder Group | 1 |
9s2824 Pressure Control Group
| 9S***24 | Shift Pressure Control Group | 1 |
5d5749 Slack Adjuster Assembly
| 5D***49 | Slack Adjuster Group | 1 |
5j7977 Steering Cylinder Group--2" Bore X 5" Stroke
| 5J***77 | Steering Cylinder Group | 1 |
9j5736 Steering Follow-Up Supply Group--Field Installation
| 05***72 | Tee-Swivel | 1 |
| 06***58 | Tee Hose Assembly To | 1 |
| 1D***38 | Bolt-Top Tank,Bottom Tank To Accessory | 2 |
7d8020 Steering Gear Group--As Viewed From Front Of Machine--Part 2 Of 2
| 7D***20 | Steering Gear | 1 |
Steering Gear (7d8020 N/S)--As Viewed From Left Hand Side Of Machine
| 7D***20 | Steering Gear | 1 |
7d8020 Steering Gear Group--Part 1 Of 2
| 7D***20 | Steering Gear | 1 |
7d8020 Steering Gear Group--As Viewed From Front Of Machine
| 7D***20 | Steering Gear | 1 |
7d8020 Steering Gear Group
| 7D***20 | Steering Gear | 1 |
Steering Gear (7d8020 N/S)--As Viewed From Front Of Machine
| 7D***20 | Steering Gear | 1 |
Steering Lines (8d2220 N/S)--Part 1 Of 4
| 8D***20 | Steering Lines | 1 |
Steering Lines (8d2220 N/S)--Part 2 Of 4
| 8D***20 | Steering Lines | 1 |
Steering Lines (8d2220 N/S)--Part 3 Of 4
| 8D***20 | Steering Lines | 1 |
Steering Lines (8d2220 N/S)--Part 4 Of 4
| 8D***20 | Steering Lines | 1 |
8j4933 Steering Lines Group--Top View
| 8J***33 | Steering Lines Group | 1 |
Steering Servo-Receiver Mounting And Cylinder (8d3110 N/S)
| 8D***10 | Steering Servo-Receiver Mounting And Cylinder | 1 |
Tractor To Scraper Lines (8d2230 N/S)--Part 5 Of 5
| 8D***30 | Tractor To Scraper Lines | 1 |
Tractor To Scraper Lines (8d2230 N/S)--Part 1 Of 5
| 8D***30 | Tractor To Scraper Lines | 1 |
Tractor To Scraper Lines (8d2230 N/S)--Part 2 Of 5
| 8D***30 | Tractor To Scraper Lines | 1 |
Tractor To Scraper Lines (8d2230 N/S)--Part 4 Of 5
| 8D***30 | Tractor To Scraper Lines | 1 |
Tractor To Scraper Lines (8d2230 N/S)--Part 3 Of 5
| 8D***30 | Tractor To Scraper Lines | 1 |
Transfer Gear (5s7810 N/S)--End View--Part 1 Of 2
| 5S***10 | Transfer Gear | 1 |
Transfer Gear (5s7810 N/S)--Side View--Part 2 Of 2
| 5S***10 | Transfer Gear | 1 |
8d2380 Transfer Gear Group--Front--Part 2 Of 2
| 8D***80 | Transfer Gear | 1 |
Transfer Gear (8d2380 N/S)--Front--Part 1 Of 2
| 8D***80 | Transfer Gear | 1 |
Transmission Control (8d7090 N/S)--As Viewed From Right Hand Side Of Machine--Part 1 Of 3
| 8D***90 | Transmission Control | 1 |
Transmission Control (8d7090 N/S)--As Viewed From Right Hand Side Of Machine--Part 3 Of 3
| 8D***90 | Transmission Control | 1 |
Transmission Control (8d7090 N/S)--As Viewed From Right Hand Side Of Machine--Part 2 Of 3
| 8D***90 | Transmission Control | 1 |
5s7030 Governor And Drive Group
| 5S***30 | Transmission Governor And Drive Group | 1 |
9s5230 Transmission Hydraulic Control Group--Part 2 Of 2
| 9S***30 | Transmission Hydraulic Control Group | 1 |
9s5230 Transmission Hydraulic Control Group--Part 1 Of 2
| 9S***30 | Transmission Hydraulic Control Group | 1 |
Transmission Pump And Lines (6d8090 N/S)
| 6D***90 | Transmission Pump And Lines | 1 |
2s5842 Transmission Pump Group
| 2S***42 | Transmission Pump Group | 1 |
4d2287 Valve Assembly
| 4D***87 | Valve As; -Parking, Service | 1 |
6d1039 Valve Assembly
| 6D***39 | Valve As; -Exhaust Bypass-Exhaust Diverter | 1 |
6d856 Valve Assembly
| 6D***56 | Valve As; -Differential Lock-Parking Brake | 1 |
4d487 Valve Assembly
| 4D***87 | Valve As-Check; -Air Supply-Primary Air Tank-Service Brake Control | 1 |
7d2316 Control Valve Assembly
| 7D***16 | Valve As-Control | 1 |
5d3056 Double Check Valve Assembly
| 5D***56 | Valve As-Double Check; -Brakesaver Air Supply | 1 |
3d9943 Horn Valve
| 3D***43 | Valve As-Horn | 1 |
6d3546 Safety Valve Assembly
| 6D***46 | Valve As-Safety | 1 |
Valve Assemblies And Lines
4d1669 Valve Assembly
| 4D***69 | Valve Assembly | 1 |
2r619 Double Check Valve Assembly
| 2R***19 | Valve Group-Check; -Air System-Parking Brake-Scraper Brake-Service Brake Control | 1 |
8j4420 Control Valve Group
| 8J***20 | Valve Group-Control | 1 |
9s2818 Governor Cut-Off Valve Group
| 9S***18 | Valve Group-Cutoff | 1 |
9j5738 Pilot Valve Group
| 9J***38 | Valve Group-Pilot | 1 |
7j2271 Relief Valve Group
| 7J***71 | Valve Group-Relief | 1 |
7j4012 Selector Valve Group
3p2973 Shift Pressure Valve Group
| 3P***73 | Valve Group-Shift Pressure | 1 |
9j5132 Vane Pump Group--Type 2
| 9J***32 | Vane Pump Group | 1 |
9j5132 Vane Pump Group--Type 1
| 9J***32 | Vane Pump Group | 1 |
8j2613 Vane Pump Group
| 8J***13 | Vane Pump Group | 1 |
8j3880 Vane Pump Group
Wheel Brake (5d5460 N/S)
| 5D***60 | Wheel Brake | 1 |
Windshield (3d9000 N/S)
| 3D***00 | Windshield Group | 1 |
623 serial number reference
The PIN plate is typically located on the machine's outer frame. The serial prefix consists of the first three alphanumeric characters, which identify the model and manufacturing factory.
| Prefix | Identifies | Notes |
|---|---|---|
| 11A | 623 Wheel Tractor-Scraper (Global) | Identified in technical specification documentation for the 623 model. |
Frequently asked questions
What engine is used in the Caterpillar 623?
The Caterpillar 623 is equipped with a Cat C13 engine, providing 304 kW (407 hp) of flywheel power.
What is the operating weight of the machine?
The empty operating weight is approximately 88,061 lb (39,937 kg), though total weight varies by configuration and attachments.
What replaced the Caterpillar 623?
Specific successor models are not explicitly listed in the provided documentation; however, the machine is categorized as a non-current product within the wheel tractor-scraper lineup.
What 623 owners discuss
What engine models are typically found in the various Caterpillar 623 series?
Engine configurations vary by series: older models like the 623E may use a 3406 engine, while newer iterations such as the 623H and 623K utilize C13 ACERT engines. Some configurations also feature a C9.3 scraper engine.
What are common hydraulic issues reported with the 623B model?
Operators have reported frequent hydraulic hose failures, particularly in the neck area. Specific issues include elevator chain stalling and floor movement instability; troubleshooting may require checking relief valve spring pressures or verifying that air valves are correctly directing flow to the elevator motor.
What causes low power steering performance in a 623G scraper?
Low power steering can result from hydraulic pump wear, clogged filters, or leaks within the steering circuit. A leak between the fluid reservoir and the pump can also allow air to enter the system, often causing the pump to whine.
What should be inspected if a 623 scraper experiences rough running after loading?
Inspect the electronic throttle control system, specifically checking the throttle position sensor (TPS) and wiring harness for loose connections or damage. Additionally, examine the fuel delivery system, including injectors and fuel pressure regulators, for inconsistencies.
What are the common wear patterns for the elevator components on these machines?
Typical wear involves the elevator chain and sprocket. Newer designs incorporate enhanced elevator drive sprockets to reduce chain wear and scissor-style tension systems to decrease sprocket wear and prevent chain jumping.
What is a critical item to check when purchasing a used 623 scraper?
Inspect the engine for any signs of knocking, as this can indicate significant internal damage. Additionally, evaluate the condition of the bowl and flight bars, as well as the overall state of the tires.
What are the recommended fluid types for Caterpillar machine maintenance?
For engine lubrication, use Cat DEO or Cat DEO-ULS. Hydraulic systems should utilize Cat HYDO Advanced fluids to ensure optimal performance and extended drain intervals. For transmission/axle needs, TDTO or TDTO-related specifications are standard; have your dealer verify specific requirements for your serial number range.
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
Need a specific 623 part?
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