Caterpillarpipelayer(no series)
Caterpillar 594H
Maintenance schedule, common problems & OEM parts breakdown
The Caterpillar 594H is a heavy-duty sideboom pipelayer designed for high-capacity pipe handling and installation. Built within the 1975–1986 production era, this machine features a Caterpillar D353 engine providing approximately 306 kW (416 HP) of power. The configuration typically includes an extendable counterweight system utilizing 17 removable leaves, each weighing 600 kg (1,330 lb), to manage heavy loads. It is engineered with an elevated sprocket design for stability and a boom capable of reaching significant heights.
Across its production generations, the 594H maintained a reputation for durability through robust chassis construction and specialized lifting capabilities. In today's used equipment market, the 594H remains a critical asset due to its high lift capacity—reaching up to 90,700 kg (200,000 lb)—and the availability of rebuildable components. Its presence in the secondary market is driven by the ability to perform frame-up rebuilds and wet deck conversions, making it a cost-effective alternative to much newer, more expensive pipeline machines.
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 594H specifications
Engine
| Model | D353TA |
| Net Power | 410 hp (306 kW) |
Weights
| Operating Weight | 58,800 kg (129,630 lb) to 56,061.5 kg (123,600 lb) |
| Counterweight weight (extendable) | Up to 12,560 kg (27,680 lb) |
Dimensions
| Overall Length | 18 ft (5.49 m) to 19 ft 6 in (0.15 m) |
| Width Over Tracks | 2.29 m (7.5 ft) to 0.05 m (15 ft 2 in) |
| Height To Top Of Suspended Cab | 3.11 m (10.2 ft) to 0.25 m (12 ft 10 in) |
| Boom Length | 7.32 m (24 ft) to 8,530 mm (27.99 ft) |
Performance
| Max Lift Capacity | 90,700 kg (200,000 lb) |
| Pump Flow Capacity | 75.6 gpm (286.18 lpm) |
| Relief Valve Pressure | 4,640 psi (32,000 kPa) |
Service capacities (summary)
| Fuel Tank Capacity | 760 L (200.75 gal) |
| Hydraulic System Fluid Capacity | 31.8 gal (120.37 L) |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
594H fluids & capacities
| System | Capacity | Recommended fluid |
|---|---|---|
| Engine crankcase (with filter) | Not specified | Cat DEO (SAE 15W-40 or SAE 10W-30 preferred for temperatures above -18°C/0°F and below 40°C/104°F) |
| Fuel tank | 760 l (200.75 US gal) | Diesel |
| Hydraulic system and tank | Not specified | Cat HYDO Advanced (SAE 10W for cold to moderate temperatures; SAE 30W for moderate to hot temperatures) |
| Grease | Not specified | Varies by application: 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 594H maintenance schedule
| Service interval | Tasks |
|---|---|
| Every 10 h |
|
| Every 250 h |
|
| Every 500 h |
|
| Every 1,000 h |
|
| Every 2,000 h |
|
Servicing the 594H beyond the schedule
Predictive Maintenance & Fluid Analysis
Utilize Caterpillar S.O.S Services to monitor engine oil, hydraulic fluid, and coolant. Analyze samples for wear metals like iron or copper, and contaminants such as silicon (dirt) or sodium (coolant). For the D353 engine, check for fuel dilution and soot loading. Regular hydraulic oil analysis is vital to detect particle counts and oxidation levels before they cause pump or valve failure.
Corrective & Common Repairs
Monitor hydraulic hoses for cracks, abrasion, or leaks to prevent catastrophic pressure loss. Inspect track pads and pins regularly; worn components can lead to expensive undercarriage rebuild. If milky oil appears on the dipstick, investigate immediate coolant contamination via head gasket failure. Ensure all hydraulic cylinders and winch components are checked for seal integrity to maintain lifting precision.
Overhaul & Rebuild Points
Focus on structural inspections of boom welds and attachment points during major service intervals. When rebuilding, evaluate the condition of the single-stage torque converter and planetary gear set. The 594H is designed for component replacement; consider full hydraulic system flushes and transmission oil changes during mid-life rebuild to restore factory-spec performance and prevent internal gear wear.
Seasonal & Environment Servicing
In high-dust or quarry environments, check air filters daily and clean radiator/oil cooler fins frequently. For extreme cold, utilize Caterpillar Arctic Platinum Grease and appropriate cold-weather engine oils. In hot climates, prioritize hydraulic oil drain intervals and monitor for overheating. Always inspect the undercarriage for debris buildup after operation in muddy or heavy clay conditions.
594H fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| E360 | Engine Coolant Temperature — High | Low coolant level, failed thermostat, or water pump issue | Diagnose cooling system; do not operate until resolved |
| E361 | Engine Coolant Temperature — Very High (Shutdown) | Severe cooling system failure | Perform full cooling system diagnosis; engine shutdown required |
| 110-0 | Engine Coolant Temp — Above Normal | Low coolant level or thermostat failure | Inspect cooling system, refill coolant, and test thermostat |
| 110-3 | Engine Coolant Temp Sensor — Voltage High | Open circuit or sensor failure | Check wiring and 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 and test speed sensor/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.
594H attachments & work tools
Boom and Lifting Systems
Available in extra-long configurations. Standard boom lengths include 24' (7.32 m) or 8,530 mm.
Counterweight Systems
Features removable counterweight leaves. Configuration includes 17 leaves at 600 kg (1,330 lb) each for a total extendable weight of 12,560 kg (27,680 lb).
Winches and Hydraulics
Equipped with Braden-Paccar winches utilizing 2-speed Bosch Rexroth hydraulic motors. Systems may feature Kawasaki hydraulic components.
Drive and Control Configurations
Available with combined steer and brake functionality. Some units feature single-lever control for three forward and three reverse speeds.
Guard and Safety Options
Customizations may include open ROPS configurations. Machine utilizes an elevated sprocket design for increased stability.
All 594H assemblies by section
Every catalogued assembly group for the Caterpillar 594H. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
59 Winch
8p3704 Cable Guide And Case Group--Top View
| 8P***04 | Cable Guide And Case Group | 1 |
6p6735 Winch Control Group--Side View - Part 1 Of 2
| 6P***35 | Control Group-Towing Winch | 1 |
6p6735 Winch Control Group--Front View - Part 2 Of 2
| 6P***35 | Control Group-Towing Winch | 1 |
2p5830 Oil Filter Group
| 2P***30 | Filter Group-Oil | 1 |
6p6736 Pump Lines Group
| 6P***36 | Lines Group-Pump; Pump Lines Group | 1 |
Name Plates And Films
| 2P***31 | Film--Cat On Each Side Of Radiator Guard; Film--Cat On Each Side--Above Drum Shaft | 2 |
| 2P***55 | Plate--Serial Number On L.H. Side Of Winch--Forward Edge | 1 |
| 2P***77 | Film--Warning On Console--Near Control Lever | 1 |
1p2187 Gear Pump Group--Basic
| 1P***87 | Pump Group-Gear | 1 |
2p2110 Gear Pump Group
| 2P***10 | Pump Group-Gear; Gear Pump Group | 1 |
1p3190 Magnetic Screen Group
| 1P***90 | Screen Group-Magnetic | 1 |
2p3640 Valve Group
| 2P***40 | Valve Group | 1 |
1p7528 Control Valve Group
| 1P***28 | Valve Group-Control; Selector & Pressure Control Valve Group. | 1 |
8p1392 Pressure Control Valve Group
| 8P***92 | Valve Group-Pressure Control | 1 |
3p4121 Selector Valve Group
| 3P***21 | Valve Group-Selector | 1 |
Winch Arrangements
| 1P***04 | Winch Drive Group | 1 |
| 1P***28 | Valve Group-Control; Selector & Pressure Control Valve Group. | 1 |
| 1P***04 | Winch Arrangement | 1 |
1p6604 Winch Drive Group
| 1P***04 | Winch Drive Group | 1 |
1p8909 Winch Group--Part 1 Of 7
| 1P***09 | Winch Group-Towing | 1 |
1p8909 Winch Group--Part 2 Of 7
| 1P***09 | Winch Group-Towing | 1 |
1p8909 Winch Group--Part 4 Of 7
| 1P***09 | Winch Group-Towing | 1 |
1p8909 Winch Group--Part 5 Of 7
| 1P***09 | Winch Group-Towing | 1 |
1p8909 Winch Group--Part 6 Of 7
| 1P***09 | Winch Group-Towing | 1 |
1p8909 Winch Group--Part 3 Of 7
| 1P***09 | Winch Group-Towing | 1 |
1p8909 Winch Group--Part 7 Of 7
| 1P***09 | Winch Group-Towing | 1 |
1p9205 Winch Mounting Group
| 1P***05 | Winch Mounting Group | 1 |
Basic Engine
Belt Tightener
Camshaft
Connecting Rod And Piston--6 Required
Crankshaft
Crankshaft Bearing Replacements
| 6N***47 | Bearing--Center | 1 |
| 6N***48 | Bearing--Center | 1 |
| 6N***49 | Bearing--Intermediate | 4 |
Cylinder Block
7n1497 Cylinder Block Assembly
| 7N***97 | Cylinder Block As; Cylinder Block Assembly | 1 |
Cylinder Block Cover
Cylinder Head
Damper
Engine Mounting Hardware
| 1D***39 | Bolt- Rear Support To Frame | 4 |
| 2B***94 | Dowel Rear Bracket Assembly To Frame; Dowel-Rear Bracket Assembly To Frame | 2 |
| 2S***15 | Washer 4.78 mm(.188 In.) Thick; Washer- Front Support To Frame | 4 |
Engine Support
Fan Belt Drive
Flywheel
Flywheel Housing
Front Housing--Timing Gear
Oil Pan
Power Take-Off--Part 1 Of 2
Power Take-Off--Part 2 Of 2
Power Take-Off Drive--Rear
Rear Gear--Camshaft And Power Take-Off
Valve Mechanism
Valve Mechanism Cover
Chassis And Undercarriage
1z8139 Radiator Guard And Shutter Group
| 1Z***39 | Radiator Guard And Shutter Group | 1 |
Battery Box
Bumper
3p8604 Frame And Case Assembly
| 3P***04 | Case & Frame As | 1 |
Crankcase Guard
Fenders--Part 2 Of 2
Fenders--Part 1 Of 2
Frame And Case
Front Idler--Part 2 Of 2
Front Idler--Part 1 Of 2
Hood And Dash--Part 2 Of 2
Hood And Dash--Part 1 Of 2
5s8658 Front Pull Hook Group
| 5S***58 | Hook Group-Front Pull | 1 |
Main Frame Support
Track Carrier Roller--4 Required
8s1747 Track Group--30" Grouser Shoe--Extreme Service--2 Required
| 8S***47 | Track Group | 1 |
Track Roller--Double Flange--8 Required
Track Roller Frame
Track Roller Frame Guard
Track Roller Guard
Cooling System
7n1970 Engine Oil Cooler Group
| 7N***70 | Engine Oil Cooler Group | 1 |
7n1968 Jacket Water Heater Group
| 7N***68 | Jacket Water Heater Group | 1 |
7n1969 Transmission Oil Cooler Group
| 7N***69 | Transmission Oil Cooler Group | 1 |
2s6096 Radiator Cap Group
| 2S***96 | Cover Group-Protection; Protection Cover Group-- Radiator Cap | 1 |
6n987 Radiator Core Protection Grid Group
| 6N***87 | Grid Group-Sand Blast Eroding | 1 |
6n6424 Water Pump Group
| 6N***24 | Pump Group-Water | 1 |
Radiator--Side View Part 2 Of 2
Radiator--Rear View-Part 1 Of 2
Reversible Fan And Guard
Torque Converter Cooler Lines
Water Lines--Part 1 Of 2
Water Lines--Part 2 Of 2
Fuel System And Governor
Accessory Drive
Aftercooler
8p456 Fuel Tank Cap Group
| 8P***56 | Cap Group-Protection | 1 |
8h4681 Primary Fuel Filter Group
| 8H***81 | Filter Group-Primary Fuel; Primary Fuel Filter Group | 1 |
Fuel Filter
Fuel Injection Pump
Fuel Injection Valves And Lines
Fuel Oil Lines
Fuel Ratio Control
Fuel Tank
Fuel Transfer Pump
Governor And Fuel Injection Pump Drive--Part 2 Of 2
Governor And Fuel Injection Pump Drive--Part 1 Of 2
Governor Control--Engine Parts--Part 1 Of 2
Governor Control--Engine Parts--Part 2 Of 2
Governor Control--Chassis Area
4n5136 Governor Group--Part 1 Of 3
| 4N***36 | Governor Group | 1 |
4n5136 Governor Group--Part 3 Of 3
| 4N***36 | Governor Group | 1 |
4n5136 Governor Group--Part 2 Of 3
| 4N***36 | Governor Group | 1 |
Governor Torque Spring
Primary Fuel Filter And Lines
8s2706 Fuel Priming Pump Group
| 8S***06 | Pump Group-Fuel Priming | 1 |
6n1813 Fuel Transfer Pump Group
| 6N***13 | Pump Group-Fuel Transfer | 1 |
Gauges And Accessories
Gauges--Part 1 Of 2
Gauges--Part 2 Of 2
8f9866 Grease Gun
| 8F***66 | Grease Gun As | 1 |
Instrument Panel Protection Cover
5s45 Seat Assembly
| 5S***45 | Seat Group | 1 |
9s5310 Seat Cushion And Frame Group
| 9S***10 | Seat Group-Adjustable | 1 |
1p1037 Tool Box Group
| 1P***37 | Tool Box Group; Tool Box Group | 1 |
9s7977 Hand Tool Group
| 9S***77 | Tool Group-Hand | 1 |
Intake And Exhaust System
Aftercooler Water Lines
Air Cleaner
Air Lines
Exhaust Manifold
Inlet Manifold
Muffler
Turbocharger
7n1758 Basic Turbocharger Group
| 7N***58 | Turbocharger Group | 1 |
Turbocharger Oil Lines
Turbocharger Shield
Lubrication System
Breather And Oil Filler
2s3025 Protection Cover Group--Oil Filler Cap
| 2S***25 | Cover Group-Protection; Protection Cover Group | 1 |
Engine Oil Lines--Part 1 Of 2
Engine Oil Lines--Part 2 Of 2
Oil Filter
Oil Level Gauge
Oil Pump Drive
9m1068 Oil Pump Group
| 9M***68 | Pump Group-Engine Oil | 1 |
6n2450 Oil Pump Group
| 6N***50 | Pump Group-Oil | 1 |
Pipelayer Controls And Components
9h284 Winch Drum Shaft Group
| 9H***84 | Shaft Group-Winch Drum | 1 |
4s9870 Winch Base Group
| 4S***70 | Base Group-Winch | 1 |
4s6649 Sheave Block And Cable Arrangement--Load Lines
| 4S***49 | Block & Cable Ar-Sheave | 1 |
4s6648 Sheave Block And Cable Arrangement--Boom Lines
| 4S***48 | Block & Cable Ar-Sheave | 1 |
7s7627 Boom Group--24 Foot
| 7S***27 | Boom Group | 1 |
4s6640 Boom Group--28 Foot--With Cables
| 4S***40 | Boom Group | 1 |
2k3810 Winch Brake Group
| 2K***10 | Brake Group-Winch | 1 |
4s6659 Winch Clutch And Drive Group--Part 2 Of 2
| 4S***59 | Clutch & Drive Group | 1 |
4s6659 Winch Clutch And Drive Group--Part 1 Of 2
| 4S***59 | Clutch & Drive Group | 1 |
7s7962 Power Take-Off Clutch Assembly
4s6644 Winch Clutch And Brake Control Group--Side View - Part 1 Of 2
| 4S***44 | Control Group-Clutch & Brake | 1 |
4s6644 Winch Clutch And Brake Control Group--Top View-Part 2 Of 2
| 4S***44 | Control Group-Clutch & Brake | 1 |
4s6641 Power Take-Off Clutch Control Group
| 4S***41 | Control Group-Power Take-Off | 1 |
4s6643 Transmission Reverse Lock Control Group
| 4S***43 | Control Group-Reverse Lock | 1 |
4s6642 Winch Transmission Control Group
| 4S***42 | Control Group-Transmission | 1 |
4s6645 Hydraulic Counterweight Group--25,050 Pounds
| 4S***45 | Counterweight Group | 1 |
5d1910 Hydraulic Tank Cap Lock Group
| 5D***10 | Cover Group-Protection; Protection Cover Group Hydraulic Tank Cap | 1 |
6j416 Lift Cylinder Group--5" Bore X 22.97" Stroke--2 Required
| 6J***16 | Cylinder Group | 1 |
2k7062 Drive Shaft Group
| 2K***62 | Drive Shaft Group | 1 |
3g6468 Hydraulic Filter Group
| 3G***68 | Filter Group-Hydraulic Oil | 1 |
4s6646 Pipelayer Frame Group--Part 1 Of 2
| 4S***46 | Frame Group | 1 |
4s6646 Pipelayer Frame Group--Part 2 Of 2
| 4S***46 | Frame Group | 1 |
5s4007 Reverse Gear Group
| 5S***07 | Gear Group-Reverse | 1 |
4s6647 Hydraulic Lines Group--Counterweight--Part 2 Of 2
| 4S***47 | Lines Group-Hydraulic | 1 |
4s6647 Hydraulic Lines Group--Counterweight--Part 1 Of 2
| 4S***47 | Lines Group-Hydraulic | 1 |
4s6636 Hydraulic Pump Lines Group
| 4S***36 | Lines Group-Pump | 1 |
4s6637 Hydraulic Control Mounting Group
| 4S***37 | Mounting Group-Hydraulic Control | 1 |
4s6638 Pump And Mounting Group
| 4S***38 | Pump & Mounting Group | 1 |
9j5046 Vane Pump Group
| 9J***46 | Pump Group-Vane | 1 |
4s9882 Drive Shaft Group
| 4S***82 | Shaft Group-Drive | 1 |
Sheave Block
2j9921 Hydraulic Tank And Valve Group
| 2J***21 | Tank & Valve Group-Hydraulic | 1 |
2k1636 Winch Transmission--Part 2 Of 2
| 2K***36 | Transmission Group-Winch | 1 |
2k1636 Winch Transmission--Part 1 Of 2
| 2K***36 | Transmission Group-Winch | 1 |
3j189 Control Valve Group
| 3J***89 | Valve Group-Control | 1 |
3j1050 Relief Valve Group
| 3J***50 | Valve Group-Relief | 1 |
2k2956 Winch Guard Group
| 2K***56 | Winch Guard Group | 1 |
Power Train-Power Transmission Unit
Drive Shaft
3p4243 Transmission Filter Group
| 3P***43 | Filter Group-Transmission | 1 |
Final Drive--Upper Half--Part 1 Of 2
Final Drive--Lower Half--Part 2 Of 2
Final Drive Gear Pump--Single Section--2 Required
Final Drive Lubrication System
Gear Pump--Scavenge And Circulating--Double Section
Planetary Transmission--Part 3 Of 3
Planetary Transmission--Part 1 Of 3
Planetary Transmission--Part 2 Of 3
Power Train Oil Lines--Front View--Part 3 Of 3
Power Train Oil Lines--Side View--Part 2 Of 3
Power Train Oil Lines--Side View--Part 1 Of 3
2p9239 Gear Pump Group--Transmission Oil
| 2P***39 | Pump Group-Gear | 1 |
7s7400 Scavenge And Circulating Pump Group
| 7S***00 | Pump Group-Scavenge & Circulating | 1 |
9m8669 Magnetic Screen Group
| 9M***69 | Screen Group-Magnetic; -Differential Lock | 1 |
Torque Converter--Part 2 Of 2
Torque Converter--Part 1 Of 2
1t611 Torque Converter Assembly
| 1T***11 | Torque Converter As | 1 |
Torque Converter Relief Valve
Transfer Gears--As Viewed From R.H. Side Of Machine
3p4100 Transmission Arrangement
| 3P***00 | Transmission Ar | 1 |
Transmission Case And Covers
Transmission Control Linkage--Top View--Part 1 Of 3
Transmission Control Linkage--Side View--Part 2 Of 3
Transmission Control Linkage--Side View--Part 3 Of 3
Transmission Hydraulic Control
1s8754 Universal Joint Assembly Part Of Drive Shaft
| 1S***54 | Universal Joint Group | 1 |
1p4145 Pressure Control Valve Group
| 1P***45 | Valve Group-Pressure Control | 1 |
6p3554 Priority Valve Group Part Of 3p4100 Transmission Arrangement
| 6P***54 | Valve Group-Priority | 1 |
3p7665 Relief Valve Group
| 3P***65 | Valve Group-Relief | 1 |
8m2502 Selector Housing And Valve Group
| 8M***02 | Valve Group-Selector | 1 |
6p994 Selector Valve Group
| 6P***94 | Valve Group-Selector | 1 |
Starting And Electrical System
Alternator--24 Volt, 50 Ampere
8n1067 Charging Alternator--24 Volt, 50 Ampere
| 8N***67 | Alternator Group-Charging | 1 |
5s9088 Alternator Assembly--24 Volt, 50 Ampere--Part 1 Of 2
| 5S***88 | Alternator Group-Charging | 1 |
5s9088 Alternator Assembly--24 Volt, 50 Ampere--Part 2 Of 2
| 5S***88 | Alternator Group-Charging | 1 |
Battery And Wiring--24 Volt--Part 2 Of 4
Battery And Wiring--24 Volt--Part 4 Of 4
Battery And Wiring--24 Volt--Part 3 Of 4
Battery And Wiring--24 Volt--Part 1 Of 4
1z6400 Boom Lighting Group--24 Volt
| 1Z***00 | Boom Lighting Group | 1 |
7n8604 Electric Starting Motor Group--24 Volt--Part 1 Of 3
| 7N***04 | Electric Starting Motor Group | 1 |
7n8604 Electric Starting Motor Group--24 Volt--Part 2 Of 3
| 7N***04 | Electric Starting Motor Group | 1 |
7n8604 Electric Starting Motor Group--24 Volt--Part 3 Of 3
| 7N***04 | Electric Starting Motor Group | 1 |
Emergency Starting Receptacle
3s5160 Glow Plug Group
| 3S***60 | Glow Plug And Wiring Group; Glow Plug Group | 1 |
Glow Plug Wiring
3p5885 Wiring Harness Assembly--Dash
| 3P***85 | Harness As-Wiring | 1 |
Lighting
8s3196 Electric Starting Motor Group--24 Volt
| 8S***96 | Motor Group-Electric Starting; Electrical Starting Motor Group | 1 |
1p7034 Emergency Starting Receptacle Group
| 1P***34 | Receptacle Group-Auxiliary Start | 1 |
7n718 Disconnect Switch Assembly
| 7N***18 | Switch As-Disconnect; -Battery-Ground Level | 1 |
8p7908 Wiring Harness Assembly
| 8P***08 | Wiring Harness Assembly | 1 |
Steering Clutches And Brakes
Brake Hydraulic Mechanism (L.H.)--Part 1 Of 2
Brake Hydraulic Mechanism (R.H.)--Part 2 Of 2
Steering Brakes--Top View - Part 2 Of 2
Steering Brakes--Side View--Part 1 Of 2
Steering Clutch Hydraulic Control--Side View--Part 2 Of 2
Steering Clutch Hydraulic Control--Top View--Part 1 Of 2
Steering Clutches And Brakes
8p7813 Control Valve Group
| 8P***13 | Valve Group-Control | 1 |
594H serial number reference
Locate the ID plate on the machine outer frame. The prefix consists of the first three alphanumeric characters of the serial number.
| Prefix | Identifies | Notes |
|---|---|---|
| 48W | Standard configuration | Identified via specific unit listing; includes D353TA engine with 410 HP (306 kW) output. |
| 96V | Series/Generation identifier | Covers serial range 00326-up; includes configuration with electric hour meter and 24' (7.62 m) boom. |
Frequently asked questions
What engine is used in the Caterpillar 594H?
The Caterpillar 594H is powered by a Caterpillar D353 in-line, 6-cylinder diesel engine, delivering approximately 306 kW (416 HP).
What is the operating weight of this machine?
The net operating weight varies by configuration; documented weights include approximately 55,500 kg (122,357 lb) and up to 123,600 lb (56,061 kg).
What replaced the Caterpillar 594H?
The 594H is part of a lineage of pipelayers that includes models like the 587R and newer high-capacity hydraulic sidebooms.
What 594H owners discuss
What are common causes for transmission power loss in the 594H pipelayer?
Power loss in the transmission often results from worn or damaged O-rings causing hydraulic leaks. Operators should also inspect for internal valve blockages, pump wear, and ensure all seals are properly seated to maintain pressure.
What is the typical engine configuration and power output for a 594H?
The 594H can be equipped with a Caterpillar D353TA engine producing 410 HP or a Caterpillar D353 engine providing 306 kW. Specific configurations may also feature the D353 engine.
What hydraulic behaviors indicate potential system failure in this machine type?
Loss of pressure, overheated oil, and jerky movement are primary indicators of contamination or internal leakage. Low hydraulic oil levels can specifically cause cavitation that destroys pumps.
Are there known electrical issues affecting Caterpillar machines?
Electrical instability is a frequent issue, often caused by moisture intrusion into connectors, stressed wiring harnesses, or failing charging systems. Loose or corroded grounds and battery deterioration can also cause the ECM to behave erratically.
What should be checked regarding the counterweight on a 594H?
The 594H utilizes removable counterweight leaves. Each leaf weighs 600 kg (1,330 lb), and the configuration includes 17 leaves.
What is critical to check when purchasing a used 594H?
Verify the exact serial-prefix specification sheet and the installed attachment package. Check for any history of transmission power loss or hydraulic pressure drops, and inspect the condition of the boom and counterweight leaves.
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
Need a specific 594H part?
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