Caterpillarwheel tractor-scraperwheel tractor
Caterpillar 633E II
Maintenance schedule, common problems & OEM parts breakdown
The Caterpillar 633E II is a high-performance, heavy-class wheel tractor-scraper designed for efficient earthmoving. This series features an 18 L (1099 in³) 3408E engine providing up to 490 hp (366 kW) net power. The machine operates with a total loaded weight of approximately 194,580 lb (88,260 kg) and utilizes an eight-speed power shift transmission. It is configured as an elevating scraper with a two-stage ejection system and a 34 yd³ (26 m³) heaped bowl capacity.
The 633E II generation introduced advanced electronic controls, including the Electronically Controlled Cushion Hitch and EPTC II transmission management, to improve ride quality and drivetrain longevity. This machine remains highly relevant in the used parts market due to high component commonality with other Caterpillar scraper series, such as the 631E II and 637E II. Its robust 3408E powertrain and durable cellular bowl construction make it a primary target for fleet owners seeking reliable, high-capacity production capabilities.
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 633E II specifications
Engine
| Tractor Engine Model | 3408E / 3408TA |
| Net Power (Gears 1-2) | 450 hp (335.6 kW) |
| Net Power (Gears 3-8) | 490 hp (365.4 kW) |
| Gross Power (Gears 1-2) | 475 hp (354.3 kW) |
| Gross Power (Gears 3-8) | 515 hp (384.1 kW) |
| Displacement | 1099 cu in (18.1 L) |
| Bore | 5.4 in (137.2 mm) |
| Stroke | 6 in (152.4 mm) |
| Power Ratings (Standard) | EEC 80/1269: 490 hp (365.4 kW); SAE J1349: 485 hp (361.7 kW); ISO 9249: 490 hp (365.4 kW); DIN 70020: 508 PS |
Weights
| Total Operating Weight (Empty) | 112,580 lb (51,066 kg) to 112,678.3 lb (51,110 kg) |
| Total Shipping Weight | 111,158 lb (50,420.5 kg) to 111,158 lb (50,526 kg) |
| Tractor Shipping Weight | 46,200 lb (20,956 kg) |
| Scraper Shipping Weight | 64,958 lb (29,464.5 kg) to 64,958 lb (29,526 kg) |
| Front Axle Weight (Empty) | 72,051 lb (32,681.8 kg) |
| Rear Axle Weight (Empty) | 40,529 lb (18,383.7 kg) |
| Front Axle Weight (Loaded) | 99,236 lb (45,012.7 kg) |
| Rear Axle Weight (Loaded) | 95,344 lb (43,247.4 kg) |
Dimensions
| Overall Machine Length | 583.21 in (14,813.28 mm) |
| Overall Machine Width | 159.5 in (4,051.3 mm) |
| Overall Machine Height | 13.92 ft (4,240 mm) |
| Wheelbase | 29.6 ft (9,020 mm) to 355.2 in (9,021 mm) |
| Width - Inside of Bowl | 134 in (3,403.6 mm) to 134 in (3arr 3,405 mm) |
| Width - Outside Rear Tires | 143.2 in (3,637.28 mm) to 143.2 in (3,636 mm) |
| Height - Top of Cab | 1 ft (0.31 m) to 146.3 in (3,715 mm) |
| Height - Overall Shipping | 166.9 in (4,239.26 mm) to 166.9 in (4,240 mm) |
| Ground Clearance - Maximum | 19.8 in (503 mm) to 19.8 in (502 mm) |
Performance
| Max Forward Speed | 33 mph (53 km/h) to 33.4 mph (53.8 km/h) |
| Reverse Speed | 6.2 mph (9.9 km/h) |
| Transmission Gear Ratios (Forward) | 1: 3 mph; 2: 5.3 mph; 3: 7.4 mph; 4: 10.1 mph; 5: 13.5 mph; 6: 18.3 mph; 7: 24.7 mph; 8: 33.4 mph |
| Steering Angle - Right | 90 Degrees |
| Steering Angle - Left | 85 Degrees |
| Width - 180 Degree Turn | 40.1 ft (12.3 m) to 40.08 ft (12.2 m) |
| Rated Payload | 82,012 lb (37,200 kg) to 82,000 lb (37,194.6 kg) |
| Scraper Capacity - Heaped | 34.1 yd³ (26 m³) to 34 yd³ (26 m³) |
Service capacities (summary)
| Fuel Tank | 215 gal (813.9 L) to 215 gal (814 L) |
| Hydraulic Reservoir | 50 gal (189.3 L) to 50 gal (190 L) |
| Transmission | 33 gal (125 L) to 33 gal (127 L) |
| Differential | 36 gal (136.3 L) to 36 gal (136 L) |
| Cooling System | 33 gal (125 L) to 33 gal (126 L) |
| Crankcase | 11.7 gal (44.3 L) to 11.7 gal (45 L) |
| Final Drive - Each | 7 gal (26.5 L) to 7 gal (25 L) |
| Wheel Coolant - Each | 19.5 gal (73.9 L) to 19.5 gal (75 L) |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
633E II fluids & capacities
| System | Capacity | Recommended fluid |
|---|---|---|
| Engine Crankcase | 45 l (11.7 gal) | Cat DEO-ULS (for Tier 4 engines with aftertreatment) or Cat DEO; SAE 10W-30 preferred for ambient temperatures between -18°C and 40°C |
| Cooling System | 126 l (33 gal) | Not specified |
| Fuel Tank | 814 l (215 gal) | Not specified |
| Transmission | 127 l (33 gal) | Cat TDTO |
| Differential | 136 l (36 gal) | Not specified |
| Final Drives (each) | 25 l (7 gal) | Cat TDTO |
| Hydraulic Reservoir | 190 l (50 gal) | Cat HYDO Advanced |
| Wheel Coolant (each) | 75 l (19.5 gal) | Not specified |
| Grease | Not specified | Cat Multipurpose Grease (low-load/low-speed); Cat Advanced 3Moly Grease (medium-load/medium-speed); Cat Ultra 5Moly Grease (high-load/high-speed) |
Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.
Caterpillar 633E II maintenance schedule
| Service interval | Tasks |
|---|---|
| Every 10 h |
|
| Every 250 h |
|
| Every 500 h |
|
| Every 1,000 h |
|
| Every 2,000 h |
|
Servicing the 633E II beyond the schedule
Predictive Maintenance & Fluid Analysis
Utilize Caterpillar S.O.S Services to monitor the 3408E engine and hydraulic systems. Regularly analyze engine oil for wear metals like iron or copper, and check hydraulic fluid for particle counts and water content. Monitoring coolant pH and SCA levels prevents internal liner pitting. Use these samples to detect early signs of fuel dilution or component degradation before they necessitate expensive engine or pump replacements.
Corrective & Common Repairs
Address hydraulic leaks at O-ring face seals promptly to maintain system pressure. Monitor the electronic cushion hitch for any faults in the nitrogen-over-oil accumulators that could cause excessive road shock. If engine smoke increases, inspect the fuel injection system and electronic control module for delivery imbalances. Ensure all wiring harness connections on the draft arms remain secure to prevent electrical instability or sensor errors.
Overhaul & Rebuild Points
Plan major rebuilds around the 2,000-hour interval, focusing on a full transmission service and hydraulic oil change. Evaluate the 3408E engine for piston and liner wear, specifically checking the oil-cooled pistons and water-cooled liners. During structural inspections, examine the scraper bowl's cellular construction and the hitch castings for fatigue. Inspect the two-stage ejection system hydraulics to ensure smooth floor and ejector cylinder operation.
Seasonal & Environment Servicing
In high-dust or quarry environments, check air filter restriction daily and clean radiator/oil cooler fins frequently. For cold weather operations, verify the automatic ether starting aid functionality and ensure fuel quality is maintained to prevent waxing. In hot climates, prioritize checking the laminated thermal-shield integrity to protect engine compartments from heat soak and extend the life of exposed hoses and wiring.
633E II common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 1R-0716 | Filter As-Engine Oil | Lubrication service | Check fitment → |
| 8T-6765 | Plug-Pipe | Scheduled service item | Check fitment → |
| 9S-8752 | Nut-Full | Scheduled service item | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
633E II 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 or 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, or 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 or termination fault | Check CAN wiring and measure termination resistance |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
633E II attachments & work tools
Elevating Scraper Bowl
Features a heaped capacity of 34 yd³ (26 m³) and a struck capacity of 23.2 yd³ (17.7 m³). The design includes cellular construction for dent resistance and a two-stage ejection system where the floor slides back as the ejector moves forward.
Elevator Mechanism
Equipped with an infinitely variable-speed elevator featuring 14 flights. The flight face width is 9.75 in (252 mm) and spacing between flights is 24 in (610 mm).
Mounting & Hitch Systems
Utilizes an electronically controlled cushion hitch designed to dampen road shocks via nitrogen-over-oil accumulators. The system features a double kingbolt design for high external forces and includes a lock function for positive control during loading/dumping.
Push-Pull Configuration
Optional arrangement includes a hydraulically actuated bail and cushioned plate bolted to the tractor front, paired with a hook on the scraper rear. This setup allows two machines to assist each other during loading.
Hydraulic & Control Systems
Requires high hydraulic horsepower for bowl and elevator functions. The machine uses a multifunction bowl lever for integrated control and features a hydraulic servo-steering system with a 103 gpm (389 L/min) steering circuit.
Factory Guarding & Protection
Includes a scraper driveline guard to protect the output case, differential, and ejector cylinder. Laminated Thermo-Shield is used to reduce engine compartment temperatures and extend hose and wiring life.
All 633E II assemblies by section
Every catalogued assembly group for the Caterpillar 633E II. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Air Inlet And Exhaust System
126-0767 Aftercooler Gp-Water
| 0S***71 | Screw,Cap,Hexagon; Tube Assembly To Turbocharger And Elbow Mounting | 12 |
| 0S***90 | Bolt; (3/8-16x2in)(Clip Thru Spacer To Bracket As) | 4 |
| 0S***19 | Bolt,Machine Gear Retaining Part Of Kit P/N 1w***46 | 2 |
7n-8187 Cartridge Gp-Turbocharger
| 0S***16 | Screw,Cap,Hexagon H Receptacle Mtg; Bolt Brackets To Firewall Assembly | 4 |
| 12***63 | Wheel-Compressor | 1 |
| 1P***20 | Ring-Seal | 1 |
322-7949 Conversion Gp-Air Inlet & Exh
| 12***37 | Muffler Group | 1 |
| 32***49 | Conversion Group-Air Inlet & Exh | 1 |
126-5792 Lines Gp-Air
| 0L***43 | Bolt 63.5 mm (3/8" X 2 1/2" -Cover Assembly To Fender | 1 |
| 0L***52 | Capscrew (3/8 - 16 Nc X 3 1/4 Gd8, Hex) | 3 |
| 0L***70 | Bolt (2-1/4") Filler Tube Assembly To Transfer Drive Case | 3 |
179-7023 Manifold Gp-Exhaust
| 10***01 | Seal As-Exhaust | 4 |
| 10***12 | Spacer; (11.13x19.05x53-mm Thk) | 16 |
| 11***50 | Manifold-Exhaust; (Rear, Lh) | 1 |
126-6237 Muffler Gp
| 12***27 | Support As | 1 |
| 12***37 | Muffler Group | 1 |
| 16***28 | Bracket As | 2 |
4w-1495 Turbocharger Gp
| 1S***95 | Gasket-Turbocharger To Manifold; Gasket Turbocharger To Manifold | 1 |
| 2N***65 | Bolt-High Temperature; (3/8-16x1.75-In) | 4 |
| 2N***66 | Locknut; (3/8-16-Thd)(High Temperature) | 4 |
4w-1434 Turbocharger Gp
| 0S***14 | Bolt (.25" Diameter-.50" Long) | 4 |
| 4W***34 | Turbocharger Group | 1 |
| 4W***35 | Housing-Turbine | 1 |
Basic Engine
7w-6245 Cover Gp-Flywheel Housing
| 0S***66 | Bolt-Pulley To Crankshaft Adapter | 3 |
| 0S***94 | Bolt (1 In. Long 3/8 In. Dia.); Plate Assembly To Support Assembly | 1 |
| 0S***19 | Bolt,Machine Gear Retaining Part Of Kit P/N 1w***46 | 1 |
284-7031 Air Compressor Gp
| 0L***51 | Bolt Starting Engine Fuel Tank Bracket To Diesel Intake Manifold | 5 |
| 12***48 | Seal-Integral | 1 |
| 1F***58 | Nut-Full; (1/2-13-Thd)(Air Lines) | 3 |
4n-7378 Air Compressor Gp
| 0S***19 | Bolt,Machine Gear Retaining Part Of Kit P/N 1w***46 | 6 |
| 11***37 | Kit-Piston Ring; (Compressor 5 Ring) | 1 |
| 1W***03 | Plug | 2 |
4n-1092 Balancer Gp
| 0L***51 | Bolt Starting Engine Fuel Tank Bracket To Diesel Intake Manifold | 4 |
| 1B***82 | Bolt (1.25 In. Long X .313 In. Dia.) | 1 |
| 1W***49 | Shaft-Balance Weight | 1 |
108-1547 Camshaft Gp
| 0S***09 | Bolt (3/4") Filler Tube Assembly To Transfer Drive Case | 2 |
| 10***74 | Gear-Camshaft Drive; (86-Teeth) | 1 |
| 10***47 | Camshaft Group | 1 |
4n-6866 Cover Gp-Cylinder Block
| 0S***94 | Bolt (1 In. Long 3/8 In. Dia.); Plate Assembly To Support Assembly | 12 |
| 23***37 | Seal-Integral | 1 |
| 23***71 | Seal-Integral | 1 |
126-0768 Cover Gp-Front Housing
| 0L***52 | Capscrew (3/8 - 16 Nc X 3 1/4 Gd8, Hex) | 6 |
| 0S***94 | Bolt (1 In. Long 3/8 In. Dia.); Plate Assembly To Support Assembly | 3 |
| 11***21 | Support-Housing; (Rh) | 1 |
4n-8159 Cover Gp-Oil Pan
| 0S***87 | Bolt-Bracket Assembly To Timing Gear | 2 |
| 0S***88 | Bolt,Machine; Hose Assembly Mounting,Hose Assembly To Transmission,And To Torque Converter | 2 |
| 10***72 | Seal-O-Ring; (40.64-mm Id) | 2 |
125-9246 Cover Gp-Valve Mechanism
| 10***88 | Base-Valve Mechanism Cover | 4 |
| 11***84 | Cover-Valve Mechanism | 1 |
| 11***15 | Cover As-Valve | 3 |
1w-5009 Crankshaft As
| 1W***09 | Crankshaft As | 1 |
| 4N***84 | Dowel; (.75 Long) | 1 |
| 7N***91 | Gear-Crankshaft; (80-Teeth) | 1 |
1w-5010 Crankshaft Gp
| 1W***09 | Crankshaft As | 1 |
| 1W***10 | Crankshaft Group; Crankshaft Group | 1 |
| 24***18 | Kit-Crankshaft Bearing | 0 |
110-3779 Cylinder Block As
| 11***20 | Seal-O-Ring; (Mid-Liner) | 8 |
| 11***79 | Cylinder Block As | 1 |
| 14***17 | Seal-O-Ring; (140.20mm Id) | 8 |
109-9009 Cylinder Block Gp
| 10***17 | Stud-Taperlock | 18 |
| 10***09 | Cylinder Block Group | 1 |
| 11***09 | Cylinder Block As | 1 |
143-0040 Cylinder Head As
| 14***40 | Cylinder Head As | 1 |
| 1W***83 | Insert-Valve Seat; (Exhaust)(Standard) | 8 |
| 3B***23 | Core Plug--Flywheel Housing Pinion Shaft Hole | 8 |
143-3614 Cylinder Head As
| 10***94 | Dowel | 2 |
| 14***40 | Cylinder Head As | 1 |
| 14***14 | Cylinder Head As | 1 |
107-7319 Cylinder Head Gp
| 03***27 | Seal-O-Ring; (19.18mm Id) | 2 |
| 06***61 | Seal-O-Ring (Id=40.87mm) | 8 |
| 10***92 | Stud-Taperlock; (3/8-16x3.93in) | 16 |
107-7320 Cylinder Head Gp
| 10***20 | Cylinder Head Group | 1 |
| 12***21 | Valve-Exhaust | 8 |
| 12***22 | Valve-Inlet | 8 |
4p-5893 Damper Gp
| 16***26 | Damper Assem. | 1 |
| 16***00 | Spacer; (131.57mmx163.6mmx8mm Thk) | 1 |
| 1A***03 | Bolt 12.07 cm(4.75 In.) Long | 6 |
9n-0725 Drive Gp-Accessory
| 5P***40 | Seal-O-Ring | 1 |
| 6B***83 | Nut,Plain,Hexagon Lever | 1 |
| 7N***22 | Gear-Compressor Drive; (46-Teeth) | 1 |
7w-4999 Flywheel Gp
| 0S***76 | Bolt 5.08 cm(2 In.) Long | 12 |
| 4D***04 | Washer,Flat Cover Mtg,Accessory Drive | 12 |
| 4N***14 | Gear; (113-Teeth)(Flywheel Starter) | 1 |
126-7281 Gear Gp-Front
| 0S***71 | Screw,Cap,Hexagon; Tube Assembly To Turbocharger And Elbow Mounting | 1 |
| 10***13 | Plate-Retaining | 1 |
| 11***17 | Plate-Thrust | 1 |
4n-3825 Gear Gp-Rear
| 1B***75 | Bolt (" " " ); Bolt ( " " " ) | 4 |
| 4N***25 | Gear Group-Rear; Rear Timing Gear Group | 1 |
| 4W***85 | Gear-Camshaft; (86-Teeth) | 1 |
4n-9680 Governor Gp-Air Compressor
| 2S***23 | Cover As; (Governor) | 1 |
| 4N***80 | Governor Group-Air Compressor | 1 |
| 9M***02 | Kit; (Governor Overhaul) (Includes Cover, Gasket, Grommet, Spring, Filter, Valve And Ring) | 1 |
7c-3617 Housing Gp-Flywheel
| 0S***91 | Screw,Cap,Hexagon Bearing Retainer; Part Of Kit P/N 1w***82 | 1 |
| 16***94 | Gasket | 1 |
| 1C***51 | Bolt--Installation Of 2v***26 Retainer | 2 |
126-7280 Housing Gp-Front
| 0L***52 | Capscrew (3/8 - 16 Nc X 3 1/4 Gd8, Hex) | 2 |
| 0T***73 | Bolt (3/8) (63.5mm Long) (On Cab Of Cover Assem.) | 3 |
| 12***80 | Housing Group-Front | 1 |
126-2267 Lifting Gp-Engine
| 0S***87 | Bolt-Bracket Assembly To Timing Gear | 4 |
| 11***75 | Bracket-Lifting; (Right) | 1 |
| 11***15 | Bracket-Lifting; (Left) | 1 |
114-5213 Lines Gp-Air Compressor
| 03***49 | Elbow; (90 Degree, 37 Degree Flared) | 1 |
| 03***69 | Elbow-Flared; (1/2-14 Nptf) | 1 |
| 0S***09 | Bolt (3/4") Filler Tube Assembly To Transfer Drive Case | 1 |
6i-3744 Pan Gp-Oil -Engine
| 11***14 | Pan-Oil; (Engine Oil) | 1 |
| 2P***03 | Bolt-Washer Head; (3/8-16x1.25-In) | 32 |
| 4N***51 | Gasket; (Engine Oil Pan) | 1 |
192-8808 Piston & Rod Gp
| 13***61 | Ring-Piston; (Top)(Top) | 1 |
| 15***56 | Bolt-Special; (Oil Jet) | 1 |
| 16***78 | Rod As-Connecting | 1 |
125-9323 Plug Gp-Cylinder Block
| 12***23 | Plug Group-Cylinder Block | 1 |
| 6V***89 | Seal-O-Ring (Id=19.18mm) | 3 |
| 7W***34 | Plug-Pipe (3/8-18 Nptf Thd) | 6 |
126-1336 Plug Gp-Cylinder Head
| 12***36 | Plug Group-Cylinder Head | 1 |
| 4N***32 | Plug-Cup | 2 |
| 5P***63 | Plug-Cup | 3 |
107-1954 Rocker Arm Gp
| 10***54 | Rocker Arm Group | 1 |
| 10***03 | Screw; (3/8-24x1.67-In)(Intake) | 2 |
| 12***63 | Bracket-Shaft | 1 |
319-0785 Seal Gp-Crankshaft -Rear
| 14***68 | Seal-Crankshaft; (Rear)(Flywheel Housing) | 1 |
| 31***85 | Seal Group-Crankshaft; -Rear | 1 |
319-7401 Seal Gp-Crankshaft -Front
| 14***67 | Seal Group-Crankshaft; (Front) | 1 |
| 31***01 | Seal Group-Crankshaft; -Front | 1 |
108-2796 Support Gp-Engine
| 10***96 | Support Group-Engine | 1 |
| 22***72 | Support-Engine | 1 |
| 2H***88 | Bolt- 12 cm(4.75 In.) Long-Location "F" | 2 |
108-1551 Valve Mechanism Gp
| 0L***43 | Bolt 63.5 mm (3/8" X 2 1/2" -Cover Assembly To Fender | 8 |
| 10***89 | Bridge-Valve | 16 |
| 10***88 | Valve Lifter Assem | 16 |
Cooling System
134-5954 Lines Gp-Water
| 0L***43 | Bolt 63.5 mm (3/8" X 2 1/2" -Cover Assembly To Fender | 1 |
| 0S***87 | Bolt-Bracket Assembly To Timing Gear | 5 |
| 0S***88 | Bolt,Machine; Hose Assembly Mounting,Hose Assembly To Transmission,And To Torque Converter | 6 |
126-1337 Lines Gp-Water
| 0L***52 | Capscrew (3/8 - 16 Nc X 3 1/4 Gd8, Hex) | 1 |
| 0S***71 | Screw,Cap,Hexagon; Tube Assembly To Turbocharger And Elbow Mounting | 4 |
| 0S***88 | Bolt,Machine; Hose Assembly Mounting,Hose Assembly To Transmission,And To Torque Converter | 1 |
126-4944 Lines Gp-Water
| 0S***88 | Bolt,Machine; Hose Assembly Mounting,Hose Assembly To Transmission,And To Torque Converter | 1 |
| 0S***94 | Bolt (1 In. Long 3/8 In. Dia.); Plate Assembly To Support Assembly | 8 |
| 0S***21 | Bolt --Brace To Starting Engine Mounting Pad; Bolt-- Brace To Starting Engine Mounting Pad | 1 |
4n-1951 Pump Gp-Water
| 10***49 | Adapter-Inlet | 1 |
| 11***79 | Seal-O-Ring | 1 |
| 11***80 | Seal-O-Ring | 1 |
137-1338 Pump Gp-Water
| 0S***91 | Screw,Cap,Hexagon Bearing Retainer; Part Of Kit P/N 1w***82 | 1 |
| 10***30 | Bearing As-Roller | 1 |
| 11***21 | Plug-Felt; (Water Pump Housing) | 1 |
Electrical And Starting System
7c-1989 Alternator Gp-Charging
| 13***77 | V-Belt; (Alternator) | 1 |
| 1S***89 | Rod End,Generator C Bracket Uoc:Bsu,Bsw | 1 |
| 2W***15 | Wire As; (Alternator) | 1 |
3e-7577 Alternator Gp-Charging
| 10***31 | Fan-Alternator; (11-Blade) | 1 |
| 10***32 | Collar; (Alternator) | 1 |
| 10***56 | Diode As; (Alternator) | 1 |
109-0400 Control & Mtg Gp-Engine Elek
| 10***00 | Control & Mtg Group-Engine Elek | 1 |
| 11***69 | Spacer-Special; (8.2x25x89.7-mm Thk) | 4 |
| 15***72 | Control Group-Engine Electronic | 1 |
156-7172 Control Gp-Engine Electronic
| 12***74 | Screw-Pan Head; (8-32x9.52-mm) | 1 |
| 13***26 | Washer; (4.52x8.28x0.76-mm Thk) | 1 |
| 15***72 | Control Group-Engine Electronic | 1 |
322-7931 Conversion Gp-Alternator & Dec
| 12***44 | Control Group-Governor | 1 |
| 32***31 | Conversion Group-Alternator & Dec | 1 |
| 8C***54 | Cap-Receptacle | 1 |
204-7949 Sensor Gp-Position
| 10***03 | Kit; (Receptacle) (3-Pin) (Includes Receptacle As & Wedge) | 1 |
| 18***35 | Pin-Connector; (16-Ga To 18-Ga) | 3 |
| 20***49 | Sensor Group-Position; -Throttle | 1 |
161-9931 Sensor Gp-Pressure
| 15***60 | Kit-Connecting Plug; (3-Pin)(Engine Sensor Wiring Harness) | 1 |
| 16***31 | Sensor Group-Pressure; -Atmospheric | 1 |
| 18***36 | Socket-Connector; (16-Ga To 18-Ga) | 3 |
167-1709 Sensor Gp-Pressure
| 15***60 | Kit-Connecting Plug; (3-Pin)(Engine Sensor Wiring Harness) | 1 |
| 16***09 | Sensor Group-Pressure; -Injection Actuation Oil | 1 |
| 9X***13 | Sleeve (Order By cm)(Use As Required) | 0 |
194-6724 Sensor Gp-Pressure
| 15***60 | Kit-Connecting Plug; (3-Pin)(Engine Sensor Wiring Harness) | 1 |
| 19***26 | Harness As-Sensor; (16-18 Ga Wire)(Engine Oil Temperature) | 3 |
| 19***24 | Sensor Group-Pressure; -Air Inlet Manifold | 1 |
194-6722 Sensor Gp-Pressure
| 15***60 | Kit-Connecting Plug; (3-Pin)(Engine Sensor Wiring Harness) | 1 |
| 18***40 | Socket-Connector; (14-Ga To 18-Ga)(14-Ga To 18-Ga) | 3 |
| 19***22 | Sensor Group-Pressure; -Atmospheric Air | 1 |
194-6725 Sensor Gp-Pressure
| 15***60 | Kit-Connecting Plug; (3-Pin)(Engine Sensor Wiring Harness) | 1 |
| 18***40 | Socket-Connector; (14-Ga To 18-Ga)(14-Ga To 18-Ga) | 3 |
| 19***25 | Sensor Group-Pressure; -Engine Oil | 1 |
265-9033 Sensor Gp-Speed
| 15***60 | Kit-Connecting Plug; (3-Pin)(Engine Sensor Wiring Harness) | 2 |
| 19***26 | Harness As-Sensor; (16-18 Ga Wire)(Engine Oil Temperature) | 3 |
| 19***27 | Harness As-Sensor; (14-Ga Wire)(Engine Oil Temperature) | 3 |
129-6628 Sensor Gp-Speed
| 10***13 | Seal; (3 Pin Plug) | 1 |
| 12***28 | Sensor Group-Speed; -Engine Speed/Timing | 1 |
| 15***60 | Kit-Connecting Plug; (3-Pin)(Engine Sensor Wiring Harness) | 1 |
106-0735 Sensor Gp-Temperature
| 10***03 | Kit; (Receptacle) (3-Pin) (Includes Receptacle As & Wedge) | 1 |
| 10***35 | Sensor Group-Temperature; -Engine Oil | 1 |
| 18***35 | Pin-Connector; (16-Ga To 18-Ga) | 3 |
102-2240 Sensor Gp-Temperature
| 10***40 | Sensor Group-Temperature; -Output Transfer Gear Oil | 1 |
| 10***03 | Kit; (Receptacle) (3-Pin) (Includes Receptacle As & Wedge) | 1 |
| 18***35 | Pin-Connector; (16-Ga To 18-Ga) | 3 |
100-4417 Switch Gp-Flow
| 10***17 | Switch Group-Flow; -Engine Coolant | 1 |
| 17***08 | Switch Group-Flow; -Engine Coolant | 1 |
| 2B***95 | Cap Screw--Tube Assembly To Air Inlet Pipe | 2 |
121-4082 Wiring Gp-Engine Electronic
| 0S***09 | Bolt (3/4") Filler Tube Assembly To Transfer Drive Case | 1 |
| 0S***94 | Bolt (1 In. Long 3/8 In. Dia.); Plate Assembly To Support Assembly | 1 |
| 0S***20 | Bolt--Customer Grounding Bolt | 1 |
109-0401 Wiring Gp-Unit Injector
| 03***34 | Seal-O-Ring | 1 |
| 10***61 | Clip | 1 |
| 10***01 | Wiring Group-Unit Injector | 1 |
Engine Arrangement
225-0404 Conversion Ar-Engine
| 22***97 | Engine Ar | 1 |
| 22***04 | Conversion Ar-Engine | 1 |
| 32***31 | Conversion Group-Alternator & Dec | 1 |
225-0397 Engine Ar
| 10***17 | Switch Group-Flow; -Engine Coolant | 1 |
| 10***19 | Cylinder Head Group | 1 |
| 10***47 | Camshaft Group | 1 |
322-7950 Installation Gp-Engine
| 32***50 | Installation Group-Engine | 1 |
| 7C***89 | Alternator Group-Charging | 1 |
Fuel System
126-9544 Control Gp-Governor
| 12***33 | Pedal | 2 |
| 12***34 | Plate As | 2 |
| 12***14 | Pin | 2 |
125-3428 Drive Gp-Unit Inj Hyd Pump
| 11***35 | Pin | 1 |
| 12***28 | Drive Group-Unit Inj Hydraulic Pump | 1 |
| 18***49 | Drive Group-Unit Inj Hydraulic Pump | 1 |
180-6649 Drive Gp-Unit Inj Hyd Pump
| 03***01 | Bolt; --To Reverse Shaft Bearing Retainer | 2 |
| 0S***18 | Bolt; (5/16-18x1-In)(Hydraulic Pump) | 2 |
| 12***40 | Plate | 1 |
232-1168 Injector Gp-Fuel
| 11***98 | Adapter-Injection | 1 |
| 11***22 | Seal-Rectangular | 1 |
| 13***69 | Bolt-Socket Head | 2 |
166-5985 Kit-Compensator
| 16***85 | Kit-Compensator | 1 |
138-6256 Kit-Seal -Unit Injector Hydraulic Pump
| 03***53 | Seal-O-Ring; (08.92mm Id) | 3 |
| 03***27 | Seal-O-Ring; (19.18mm Id) | 2 |
| 03***39 | Seal-O-Ring (Id=9.25mm) | 1 |
126-4037 Lines Gp-Fuel Filter
| 03***33 | Seal-O-Ring; (12.42mm Id) | 4 |
| 0L***51 | Bolt Starting Engine Fuel Tank Bracket To Diesel Intake Manifold | 1 |
| 0S***09 | Bolt (3/4") Filler Tube Assembly To Transfer Drive Case | 1 |
121-4034 Lines Gp-Injector Hyd Pump
| 0L***43 | Bolt 63.5 mm (3/8" X 2 1/2" -Cover Assembly To Fender | 2 |
| 0S***88 | Bolt,Machine; Hose Assembly Mounting,Hose Assembly To Transmission,And To Torque Converter | 1 |
| 10***02 | Tube As | 1 |
126-7292 Pump & Mtg Gp-Unit Inj Hyd
| 03***33 | Seal-O-Ring; (12.42mm Id) | 1 |
| 0L***70 | Bolt (2-1/4") Filler Tube Assembly To Transfer Drive Case | 1 |
| 0S***17 | Bolt --Use Open Hole In Compressor Body | 4 |
206-2630 Pump Gp-Fuel Injection
| 10***26 | Clamp-Injector | 1 |
| 11***21 | Seal-Rectangular | 2 |
| 11***08 | Elbow-Injector | 1 |
235-2026 Pump Gp-Unit Injector Hyd
| 03***39 | Seal-O-Ring (Id=9.25mm) | 2 |
| 03***42 | Seal-O-Ring; (11.89mm Id) | 3 |
| 13***05 | Gasket-Housing | 1 |
235-2024 Pump Gp-Unit Injector Hyd
| 0S***17 | Bolt --Use Open Hole In Compressor Body | 4 |
| 11***20 | Coupling | 1 |
| 14***50 | Pump Group-Fuel Transfer | 1 |
282-1915 Valve Gp-Check
| 03***33 | Seal-O-Ring; (12.42mm Id) | 1 |
| 28***15 | Valve Group-Check; -Fuel | 1 |
| 6V***89 | Seal-O-Ring (Id=19.18mm) | 1 |
190-0016 Valve Gp-Fuel
| 03***53 | Seal-O-Ring; (08.92mm Id) | 3 |
| 10***77 | Valve Group-Solenoid; -Pressure Control | 1 |
| 19***16 | Valve Group-Fuel | 1 |
161-2309 Valve Gp-Fuel
| 03***43 | Seal-O-Ring | 1 |
| 10***06 | Seal-O-Ring (10.52mm Id) | 1 |
| 10***85 | Seal-O-Ring (6.07mm Id) | 2 |
165-1536 Valve Gp-Pressure Control
| 03***27 | Seal-O-Ring; (19.18mm Id) | 2 |
| 03***28 | Seal-O-Ring | 1 |
| 10***03 | Seal-O-Ring; (7.65mm Id) | 1 |
107-0677 Valve Gp-Solenoid
| 03***28 | Seal-O-Ring | 1 |
| 03***39 | Seal-O-Ring (Id=9.25mm) | 1 |
| 10***77 | Valve Group-Solenoid; -Pressure Control | 1 |
Lubrication System
119-8583 Fastener Gp-Oil Pump Mounting -Engine
| 0L***43 | Bolt 63.5 mm (3/8" X 2 1/2" -Cover Assembly To Fender | 1 |
| 0S***19 | Bolt,Machine Gear Retaining Part Of Kit P/N 1w***46 | 2 |
| 11***83 | Fastener Group-Oil Pump Mounting; -Engine | 1 |
125-8280 Filler Gp-Engine Oil
| 0S***88 | Bolt,Machine; Hose Assembly Mounting,Hose Assembly To Transmission,And To Torque Converter | 1 |
| 12***81 | Tube As | 1 |
| 12***80 | Filler Group-Engine Oil | 1 |
4n-2357 Filter Gp-Engine Oil
| 0S***71 | Screw,Cap,Hexagon; Tube Assembly To Turbocharger And Elbow Mounting | 4 |
| 1R***16 | Filter As-Engine Oil; (Standard Efficiency) | 2 |
| 2P***03 | Base As-Oil Filter; (Engine) | 2 |
125-8279 Gauge Gp-Oil Level (Dipstick) -Engine
| 06***39 | Seal-O-Ring | 1 |
| 0L***51 | Bolt Starting Engine Fuel Tank Bracket To Diesel Intake Manifold | 1 |
| 0S***94 | Bolt (1 In. Long 3/8 In. Dia.); Plate Assembly To Support Assembly | 1 |
125-8277 Lines Gp-Engine Oil
| 0L***51 | Bolt Starting Engine Fuel Tank Bracket To Diesel Intake Manifold | 1 |
| 0S***71 | Screw,Cap,Hexagon; Tube Assembly To Turbocharger And Elbow Mounting | 1 |
| 0S***88 | Bolt,Machine; Hose Assembly Mounting,Hose Assembly To Transmission,And To Torque Converter | 2 |
125-8278 Lines Gp-Filter
| 06***40 | Seal-O-Ring (Id=37.69mm) | 4 |
| 0L***70 | Bolt (2-1/4") Filler Tube Assembly To Transfer Drive Case | 1 |
| 0S***71 | Screw,Cap,Hexagon; Tube Assembly To Turbocharger And Elbow Mounting | 4 |
126-5034 Lines Gp-Turbocharger Oil
| 0L***70 | Bolt (2-1/4") Filler Tube Assembly To Transfer Drive Case | 1 |
| 0S***08 | Bolt-Support To Starting Engine Timing Gear Housing | 2 |
| 10***34 | Grommet | 1 |
116-1980 Pump Gp-Engine Oil
| 10***82 | Shaft As-Pump Drive | 1 |
| 10***73 | Shaft As-Idler | 1 |
| 11***79 | Body As-Oil Pump | 1 |
Power Train
4n-2210 Cooler Gp-Transmission Oil
| 4N***10 | Cooler Group-Transmission Oil; Oil Cooler Group--Transmission | 1 |
| 7S***67 | Gasket | 2 |
| 7W***59 | Core Group-Oil Cooler | 1 |
7w-6459 Core Gp-Oil Cooler
| 6V***49 | Seal-O-Ring (Id=11.89mm); (11.89-mm Id) | 2 |
| 7W***59 | Core Group-Oil Cooler | 1 |
| 9S***91 | Plug,Machine Thread Fuel Injection Pump | 2 |
633E II serial number reference
The PIN plate is typically located on the machine outer frame. The serial number prefix consists of the first three alphanumeric characters of the serial number. These prefixes identify the model and manufacturing factory. Confirm the exact build year and configuration via the full serial number with a Caterpillar dealer.
| Prefix | Identifies | Notes |
|---|---|---|
| 1AB | 633E II | Serial range 1AB1640-UP. Applies to 631E II, 633E II, and 637E II Series II wheel tractor-scrapers. Verify specific build year and configuration with dealer. |
| 2PS | 633E II | Serial range 2PS1-UP. Applies to 631E II, 633E II, and 637E II Series II wheel tractor-scrapers. Verify specific build year and configuration with dealer. |
| 1FB | 633E II | Serial range 1FB660-UP. Applies to 631E II, 633E II, and 637E II Series II wheel tractor-scrapers. Verify specific build year and configuration with dealer. |
| 1NB | 633E II | Serial range 1NB1390-UP. Applies to 631E II, 633E II, and 637E II Series II wheel tractor-scrapers. Verify specific build year and configuration with dealer. |
Frequently asked questions
What engine powers the 633E II?
The tractor is equipped with a Caterpillar 3408E engine featuring an 18 L (1099 in³) displacement.
What is the total operating weight of the machine?
The total operating weight when loaded is 194,580 lb (88,260 kg).
What model replaced the 633E II?
Information regarding a direct successor for the 633E II is not documented in the provided technical specifications.
What 633E II owners discuss
What are the primary engine performance characteristics for the 633E II tractor?
The 633E II utilizes a 3408E engine. Net power varies by gear selection: gears 1-2 produce 450 hp (335 kW), while gears 3-8 produce 490 hp (365 kW). Gross power ratings are slightly higher, ranging from 475 hp (354 kW) in lower gears to 515 hp (384 kW) in higher gears.
How does the transmission and power management system function during operation?
The machine features an eight-speed power shift transmission. It includes directional shift management to prevent shifting out of neutral when engine RPM is above preset levels, and controlled throttle shifting to reduce drivetrain stress by decreasing fuel injection rate prior to gear changes. A neutral coast inhibitor prevents shifting to neutral at speeds exceeding 8.1 km/h (5 mph).
What are the known hydraulic system behaviors and potential risks?
The system provides high hydraulic horsepower, with a steering circuit flow of 389 L/min (103 gpm) and a scraper circuit of 344 L/min (91 gpm). Operators should monitor for oil degradation or low levels, as insufficient hydraulic oil can cause cavitation that destroys pumps. Use Cat HYDO Advanced oils to prevent valve clogging and pump damage caused by improper additive packages.
What maintenance considerations are typical for the 3408E engine components?
The engine features oil-cooled pistons and full-length water-cooled cylinder liners to maximize heat transfer. To ensure component longevity, maintain clean air filters to prevent turbocharger damage from dust accumulation. The fuel system utilizes electronic control for precise delivery; however, use of low-quality fuel can lead to injector failure.
What should be inspected regarding the electrical and sensor systems?
The Electronic Programmable Transmission Control (EPTC II) records both current and intermittent faults. Electrical instability is a common issue in Caterpillar machines, often caused by moisture intrusion into connectors or loose/corroded grounds. Ensure the wiring harness and hose assemblies are intact, as they run down the draft arms to improve efficiency.
What is the most critical check when purchasing a used 633E II?
Verify the exact serial-prefix specification sheet and installed attachment package. Because weight, reach, and hydraulic performance can change based on configuration, you must confirm the specific serial range to ensure parts and capabilities match your requirements. Have your dealer verify the machine build date via the official SIS database.
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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