Caterpillarskid steer loadermulti terrain loader
Caterpillar 257B3
Maintenance schedule, common problems & OEM parts breakdown
The Caterpillar 257B3 is a compact track loader (MTL) designed for high-performance operation in confined spaces. Produced between 2011 and 2013, this machine features a vertical-lift boom design and is powered by the Cat C3.4 DIT 4-cylinder diesel engine, delivering 71 net horsepower (52.9 kW). The unit operates with an operating weight of approximately 8,060 lb (3,656 kg) and offers a rated operating capacity of 1,870 lb (848.2 kg) at 35% tipping load, which can increase to 2,725 lb (1,236 kg) when utilizing an optional counterweight. Available configurations include standard flow (22 GPM/83.3 LPM) and high-flow (31 GPM/117 LPM) hydraulic systems.
The B-Series 3 generation introduced significant power density improvements over the B-Series 2, specifically through a larger engine and enhanced hydraulics. The integration of the C3.4 DIT engine provided a 25% increase in net power and a 2-tier speed travel system option for varying jobsite requirements. In today's used market, the 257B3 remains a critical asset due to its specialized ability to perform like larger machines within small footprints. Its presence in the parts market is sustained by the demand for high-flow hydraulic components and robust undercarriage parts required for maintaining its heavy-duty lifting 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 257B3 specifications
Engine
| Model | Caterpillar C3.4 DIT |
| Type | 4-cycle liquid cooled diesel |
| Net Power | 71.0 kW (95.0 hp) to 74.6 kW (100.0 hp) |
| Displacement | 3294 cc (201 cu.in.) to 3.4 L |
| Cylinders | 4, in-line |
| Emissions Tier | Tier 4 Interim |
| Aspiration | Turbocharged |
Weights
| Operating Weight | 3655 kg (8060 lb) |
| Shipping Weight | 3330 kg (7330 lb) |
| Ground Pressure | 31.0 kPa (4.5 psi) to 0.276 bar (4.0 psi) |
Dimensions
| Width (Max, w/o Bucket) | 1675 mm (66 in.) |
| Height (Operator Cab) | 2035 mm (80 in.) |
| Height (Boom Raised) | 3895 mm (153 in.) |
| Length (Bucket On Ground) | 3440 mm (135.4 in.) |
| Ground Clearance | 245 mm (9.6 in.) to 246 mm (10.0 in.) |
| Track Width | 320 mm (12.6 in.) |
Performance
| Travel Speed (Low) | 11.1 km/h (6.9 mph) |
| Travel Speed (High) | 16.1 km/h (10.0 mph) |
| Rated Operating Capacity (35% Tipping Load) | 848 kg (1870 lb) to 848.2 kg (1870 lb) |
| Rated Operating Capacity (50% Tipping Load) | 1213 kg (2675 lb) |
| Tipping Load | 2426 kg (5350 lb) |
| Bucket Breakout Force | 2045 kg (4508 lb) |
| Dump Height (Fully Raised) | 2310 mm (91 in.) |
| Hydraulic System Pressure | 230 bar (3335 psi) |
| Standard Flow Rate | 83 lpm (22 gpm) to 83.3 lpm (22.0 gpm) |
| High Flow Rate | 117 lpm (31 gpm) |
Service capacities (summary)
| Fuel Tank Capacity | 84.0 L (22.2 gal) |
| Engine Oil Capacity | 9.0 L (2.4 gal) to 9.5 L (9.0 L) |
| Coolant Capacity | 10.0 L (2.6 gal) to 10.6 L (10.0 L) |
| Hydraulic System Capacity | 54.9 L (14.5 gal) to 55.0 L (14.5 gal) |
| Hydraulic Tank Capacity | 35.0 L (9.2 gal) |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
257B3 fluids & capacities
| System | Capacity | Recommended fluid |
|---|---|---|
| Engine Crankcase | 9.0 L (2.4 gal) | Cat DEO-ULS, SAE 10W-30 or 15W-40; API Service CE, CF-4, CG-4 |
| Cooling System | 10.0 L (2.65 gal) | Caterpillar Diesel Engine Antifreeze/Coolant |
| Fuel Tank | 84.0 L (22.2 gal) | |
| Hydraulic System | 55.0 L (14.5 gal) | Cat HYDO Advanced, SAE 30 or SAE 10W; Cat TDTO-TMS Multi-Grade |
| Hydraulic Tank | 35.0 L (9.2 gal) | |
| Final Drives (each) | 1.0 L (1.1 qt) | Cat Synthetic GO, SAE 75W-90 or 75W-140 Gear Oil; API Service GL-5 |
| Grease |
Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.
Caterpillar 257B3 maintenance schedule
| Service interval | Tasks |
|---|---|
| Every 10 h |
|
| Every 50 h |
|
| Every 100 h |
|
| Every 250 h |
|
| Every 500 h |
|
| Every 1,000 h |
|
| Every 2,000 h |
|
Servicing the 257B3 beyond the schedule
Predictive Maintenance & Fluid Analysis
Utilize S.O.S fluid analysis to monitor the health of the hydraulic system and engine. Regularly sample hydraulic oil to detect contamination before pump failure occurs. Monitor the condition of Cat DEO-ULS or SAE 10W-30/15W-40 engine oil. For the final drive, ensure Cat Synthetic GO or SAE 75W-90 gear oil levels are maintained to prevent planetary wear. Periodic testing of the cooling system additive is necessary to protect engine components.
Corrective & Common Repairs
Address hydraulic pressure drops by inspecting the main relief valve and line relief valves for proper adjustment. If the machine experiences stalling, check the redesigned dead-engine lower valve functionality. Monitor the alternator/fan belt for tension loss or fraying. When hydraulic flow decreases, inspect the piston pump and gear pumps for wear. Ensure all electrical connections at the relocated single ECM are secure to prevent intermittent sensor or diagnostic errors.
Overhaul & Rebuild Points
Major rebuild points should focus on hydrostatic transmission components, specifically the piston motor and piston pump assemblies. During undercarriage overhauls, evaluate the condition of idler wheels, sprockets, and track tensioners. If engine performance degrades, consider a top-end service for the C3.4 DIT, focusing on fuel injector and turbocharger inspection. Rebuilding lift arm cylinders requires checking for seal integrity and rod scoring to maintain rated breakout forces.
Seasonal & Environment Servicing
In dusty environments, prioritize frequent cleaning of the primary and secondary engine air filters and the radiator/oil cooler fins to prevent overheating. During cold weather operations, ensure the automatic glow-plug activation is functional and check battery CCA levels. For high-moisture use, inspect all pins, bushings, and attachment points for corrosion. Ensure the hydraulic tank breather is replaced regularly to prevent moisture ingress into the 14.5 gal (55 L) hydraulic reservoir.
257B3 fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| 600 | Hydraulic oil temperature issue | Faulty hydraulic sensor or electrical connection failure | Use a multimeter to check sensor signal continuity and voltage supply; verify ECM grounds and connectors are secure |
| 110-0 | Engine coolant temperature above normal operating range | Low coolant level, thermostat failure, or radiator blockage | Inspect cooling system, refill coolant, and test thermostat function |
| 110-3 | Engine coolant temperature sensor voltage high | Open circuit or sensor failure | Check wiring harness and replace sensor if confirmed faulty |
| 41-3 | 8-Volt DC supply voltage above normal | Short to power on the 8V reference circuit | Inspect sensors sharing the 8V supply and isolate the fault |
| 41-4 | 8-Volt DC supply voltage below normal | Short to ground on the 8V reference circuit | Disconnect sensors one at a time to locate the short |
| 174-3 | Engine fuel temperature sensor voltage above normal | Open circuit in sensor wiring | Inspect wiring 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 the speed sensor and tone ring |
| 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.
257B3 attachments & work tools
Buckets
Includes general purpose, snow, rock/stump remover, manure grapple, brush grapple, flat bottom grapple, and rock grapple buckets. Capacities vary by configuration.
Digging & Boring
Available tools include augers, tree auger kits, and post hole diggers for precise ground penetration.
Material Handling & Landscaping
Options consist of pallet forks, bale spear stabbers, brushcutters (closed-deck or open-faced industrial), and rakes.
Cleaning & Site Prep
Includes broom attachments for sweeping sidewalks, parking lots, and road surfaces, as well as grading/dozer blades.
Mounting & Hydraulics
Uses a skid steer coupler system. High flow (31 GPM / 117 L) or standard flow (21 GPM / 83 L) hydraulic arrangements are available to support various tool requirements.
Factory Configurations & Guarding
Notable options include an optional counterweight to increase rated operating capacity from 2,675 lb (1,213 kg) to 2,725 lb (1,236 kg). Cab guarding includes polycarbonate top and rear windows.
All 257B3 assemblies by section
Every catalogued assembly group for the Caterpillar 257B3. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Air Inlet And Exhaust System
326-5331 Air Cleaner Gp
| 32***31 | Air Cleaner Group | 1 |
326-5330 Air Cleaner Gp
| 32***30 | Air Cleaner Group | 1 |
326-5332 Air Cleaner Gp
| 32***32 | Air Cleaner Group | 1 |
247-6317 Lines Gp-Air
| 24***17 | Lines Group-Air | 1 |
326-5338 Lines Gp-Air
| 32***38 | Lines Group-Air | 1 |
315-7769 Lines Gp-Air
| 31***69 | Lines Group-Air | 1 |
287-5323 Manifold Gp-Exhaust
| 28***23 | Manifold Group-Exhaust | 1 |
335-5750 Manifold Gp-Inlet
| 33***50 | Manifold Group-Inlet | 1 |
258-2462 Muffler & Mounting Gp
| 25***62 | Muffler & Mounting Group | 1 |
315-7768 Turbocharger Gp
| 31***68 | Turbocharger Group | 1 |
Basic Engine
323-2009 Accessory Gp-Engine
| 32***09 | Accessory Group-Engine | 1 |
292-4041 Bearing Gp-Main
| 29***41 | Bearing Group-Main | 1 |
315-8329 Camshaft Gp
| 31***29 | Camshaft Group | 1 |
287-4033 Connecting Rod Gp
| 28***33 | Tube Brace, Connecting Rod Group | 1 |
315-7762 Cover Gp-Valve Mechanism
| 31***62 | Cover Group-Valve Mechanism | 1 |
314-9860 Crankshaft Gp
| 31***60 | Crankshaft Group | 1 |
330-7633 Cylinder Block Gp
| 33***33 | Cylinder Block Group | 1 |
233-5500 Cylinder Head Gp
| 23***00 | Cylinder Head Group | 1 |
326-5349 Drain Gp-Engine Oil
| 32***49 | Drain Group-Engine Oil | 1 |
314-9861 Flywheel Gp
| 31***61 | Flywheel Group | 1 |
315-7766 Gear Gp-Front
| 31***66 | Gear Group-Front | 1 |
280-8407 Guard Gp-Belt
| 28***07 | Guard Group-Belt | 1 |
361-2874 Housing Gp-Flywheel
| 36***74 | Housing Group-Flywheel | 1 |
315-8336 Housing Gp-Front
| 31***36 | Housing Group-Front | 1 |
315-7761 Lifting Gp-Engine
| 31***61 | Lifting Group-Engine | 1 |
326-5329 Mounting Gp-Engine
| 32***29 | Mounting Group-Engine | 1 |
363-3884 Pan Gp-Oil
| 36***84 | Pan Group-Oil | 1 |
315-8348 Piston Gp
| 31***48 | Piston Group | 1 |
287-2922 Plug Gp-Engine
| 28***22 | Plug Group-Engine; -Cylinder Block, Lh | 1 |
287-2983 Plug Gp-Engine
| 28***83 | Plug Group-Engine; -Cylinder Block, Rh | 1 |
301-3396 Pulley Gp-Crankshaft
| 30***96 | Pulley Group-Crankshaft | 1 |
287-6114 Pulley Gp-Water Pump
| 28***14 | Pulley Group-Water Pump | 1 |
287-6138 V-Belt Gp
| 28***38 | V-Belt Group; -Water Pump | 1 |
235-5880 Valve Mechanism Gp
| 23***80 | Valve Mechanism Group | 1 |
Cooling System
361-2880 Cooler Gp-Engine Oil
| 36***80 | Cooler Group-Engine Oil | 1 |
292-4040 Drain Gp-Coolant
| 29***40 | Drain Group-Coolant | 1 |
315-8355 Housing & Regulator Gp
| 31***55 | Housing & Regulator Group | 1 |
326-5340 Lines Gp-Water
| 32***40 | Lines Group-Water | 1 |
287-6056 Pump Gp-Water
| 28***56 | Pump Group-Water | 1 |
335-9117 Pump Gp-Water
| 33***17 | Pump Group-Water | 1 |
326-5373 Radiator & Hyd Oil Cooler Gp
| 32***73 | Radiator & Hydraulic Oil Cooler Group | 1 |
280-8260 Support Gp-Radiator
| 28***60 | Support Group-Radiator | 1 |
Electrical And Starting System
3e-7584 Lamp Gp-Head & Signal -Rh
| 3E***84 | Lamp Group-Head & Turn; -Rh | 1 |
315-8353 Alternator Gp-Charging
| 31***53 | Alternator Group-Charging | 1 |
105-2814 Alternator Gp-Charging
| 10***14 | Alternator Group-Charging | 1 |
328-2278 Battery & Wiring Gp
| 32***78 | Battery & Wiring Group | 1 |
328-2345 Electronics Gp-Machine
| 32***45 | Electronics Group-Machine | 1 |
235-5904 Glow Plug Gp
| 23***04 | Glow Plug Group | 1 |
218-0942 Heater Gp-Jacket Water
| 21***42 | Heater Group-Jacket Water | 1 |
218-0943 Heater Gp-Jacket Water
| 21***43 | Heater Group-Jacket Water | 1 |
361-0454 Kit-Work Tool Wiring
| 36***54 | Kit-Work Tool Wiring | 1 |
361-0452 Kit-Work Tool Wiring
| 36***52 | Kit-Work Tool Wiring | 1 |
234-4328 Lamp Gp-Flood
| 23***28 | Lamp Group-Flood; -Front, Rear, Wide Range | 1 |
234-7727 Lamp Gp-Flood
| 23***27 | Lamp Group-Flood; -Rear | 1 |
328-2344 Lamp Gp-Stop & Tail -Rear
| 32***44 | Lamp Group-Stop & Tail; -Rear | 1 |
328-2346 Lamp Gp-Stop & Tail -Rear
| 32***46 | Lamp Group-Stop & Tail; -Rear | 1 |
142-8634 Lamp Gp-Stop & Tail
| 14***34 | Lamp Group-Stop & Tail; -Stop, Tail | 1 |
142-7503 Lamp Gp-Stop & Tail
| 14***03 | Lamp Group-Stop & Tail; -12-Volt | 1 |
309-1325 Lamp Gp-Warning Beacon -Amber
| 30***25 | Lamp Group-Warning Beacon; -12-Volt, Amber | 1 |
218-6425 Lighting Gp-Flood -Front
| 21***25 | Lighting Group-Flood; -Front | 1 |
216-4746 Lighting Gp-Flood -Rear
| 21***46 | Lighting Group-Flood; -Rear | 1 |
328-2333 Lighting Gp-Roading
| 32***33 | Lighting Group-Roading | 1 |
258-4135 Relay Gp -Main Power
| 25***35 | Relay Group; -Main Power | 1 |
287-6181 Starting Motor Gp-Electric
| 28***81 | Starting Motor Group-Electric | 1 |
143-0539 Starting Motor Gp-Electric
| 14***39 | Starting Motor Group-Electric; -12-Volt | 1 |
328-2348 Switch Gp-Pressure
| 32***48 | Switch Group-Pressure; -Brake Light | 1 |
184-1564 Switch Gp-Pressure -Brake Light
| 18***64 | Switch Group-Pressure; -Brake Light | 1 |
300-1071 Switch Gp-Pressure
| 30***71 | Switch Group-Pressure; -Engine Oil | 1 |
328-2272 Wiring Gp-Cab
| 32***72 | Wiring Group-Cab | 1 |
328-2276 Wiring Gp-Engine
| 32***76 | Wiring Group-Engine | 1 |
230-3743 Wiring Gp-Horn -With Mounting
| 23***43 | Wiring Group-Horn; -With Mounting | 1 |
328-2274 Wiring Gp-Machine
| 32***74 | Wiring Group-Machine | 1 |
328-2342 Wiring Gp-Machine -Demand Fan
| 32***42 | Wiring Group-Machine; -Demand Fan | 1 |
328-2335 Wiring Gp-Work Tool
| 32***35 | Wiring Group-Work Tool | 1 |
Engine Arrangement
326-5240 Engine Ar-General
| 32***40 | Engine Ar-General | 1 |
332-8660 Engine Ar-Primary
| 33***60 | Engine Ar-Primary | 1 |
354-6544 Installation Ar-Engine
| 35***44 | Installation Ar-Engine | 1 |
Frame And Body
326-5306 Bumper Gp-Rear
| 32***06 | Bumper Group-Rear | 1 |
278-1292 Conversion Gp-Roading -Germany
| 27***92 | Conversion Group-Roading; -Germany | 1 |
278-1293 Conversion Gp-Roading -Italy
| 27***93 | Conversion Group-Roading; -Italy | 1 |
215-3926 Counterweight Gp
| 21***26 | Counterweight Group | 1 |
326-5609 Enclosure Gp-Engine
| 32***09 | Enclosure Group-Engine | 1 |
326-5473 Frame As-Lower
| 32***73 | Frame As-Lower | 1 |
326-5474 Frame As-Upper
| 32***74 | Frame As-Upper | 1 |
326-5475 Frame Gp-Loader
| 32***75 | Frame Group-Loader | 1 |
326-5457 Frame Gp-Machine
| 32***57 | Frame Group-Machine | 1 |
156-9809 Guide Gp-Lines
| 15***09 | Guide Group-Lines; -Auxiliary Hydraulic | 1 |
340-7724 Kit-Roading Conversion -Germany
| 34***24 | Kit-Roading Conversion; -Germany | 1 |
358-6921 Kit-Roading Conversion -Front
| 35***21 | Kit-Roading Conversion; -Front | 1 |
358-6920 Kit-Roading Conversion -Italy, Lights, Mirrors
| 35***20 | Kit-Roading Conversion; -Italy, Lights, Mirrors | 1 |
188-0147 Lifting Gp-Machine -4-Point
| 18***47 | Lifting Group-Machine; -4-Point | 1 |
218-5969 Lifting Gp-Machine -Single Point
| 21***69 | Lifting Group-Machine; -Single Point | 1 |
238-7671 Mirror & Mtg Gp-Rear View -With Roading Light Mount
| 23***71 | Mirror & Mtg Group-Rear View; -With Roading Light Mount | 1 |
233-5663 Mounting Gp-Registration -With Wiring & Lights
| 23***63 | Mounting Group-Registration; -With Wiring & Lights | 1 |
Fuel System
218-5602 Control Gp-Governor
| 21***02 | Control Group-Governor | 1 |
326-5344 Lines Gp-Fuel
| 32***44 | Lines Group-Fuel | 1 |
315-8350 Lines Gp-Fuel Injection
| 31***50 | Lines Group-Fuel Injection | 1 |
315-8352 Pump Gp-Fuel Injection
| 31***52 | Pump Group-Fuel Injection | 1 |
258-3442 Pump Gp-Fuel Prm & Prim Filter -Water Separator
| 25***42 | Pump Group-Fuel Prm & Prim Filter; -Water Separator | 1 |
Hydraulic System
193-0447 Accumulator & Mtg Gp-Hydraulic
| 19***47 | Accumulator & Mtg Group-Hydraulic; -Work Tool | 1 |
149-0686 Accumulator Gp-Hydraulic -Charged
| 14***86 | Accumulator Group-Hydraulic; -Charged | 1 |
227-8807 Accumulator Gp-Hydraulic -Uncharged
| 22***07 | Accumulator Group-Hydraulic; -Uncharged | 1 |
179-7001 Adapter Gp-Oil Line
| 17***01 | Adapter Group-Oil Line; -Unit Injector Pump | 1 |
326-5499 Cylinder & Mtg Gp-Lift Arm
| 32***99 | Cylinder & Mtg Group-Lift Arm | 1 |
192-2640 Cylinder Gp-Hydraulic -Coupler
| 19***40 | Cylinder Group-Hydraulic; -Coupler | 1 |
329-4955 Cylinder Gp-Lift
| 32***55 | Cylinder Group-Lift | 1 |
329-4954 Cylinder Gp-Tilt -Lh
| 32***54 | Cylinder Group-Tilt; -Lh | 1 |
329-4953 Cylinder Gp-Tilt -Rh
| 32***53 | Cylinder Group-Tilt; -Rh | 1 |
326-5770 Hydraulic Ar -With Work Tool Positioner
| 32***70 | Hydraulic Ar; -With Work Tool Positioner | 1 |
326-5740 Hydraulic Ar
| 32***40 | Hydraulic Ar | 1 |
326-5670 Hydraulic Ar
| 32***70 | Hydraulic Ar | 1 |
354-6551 Lines Gp-Auxiliary Hydraulic
| 35***51 | Lines Group-Auxiliary Hydraulic | 1 |
326-5751 Lines Gp-Coupler -Hydraulic
| 32***51 | Lines Group-Coupler; -Hydraulic | 1 |
326-5741 Lines Gp-Hydraulic Oil Cooler
| 32***41 | Lines Group-Hydraulic Oil Cooler | 1 |
326-5738 Lines Gp-Lift Cylinder -With Work Tool Positioner
| 32***38 | Lines Group-Lift Cylinder; -With Work Tool Positioner | 1 |
326-5758 Lines Gp-Lift Cylinder -Without Work Tool Positioner
| 32***58 | Lines Group-Lift Cylinder; -Without Work Tool Positioner | 1 |
360-1355 Lines Gp-Pilot -Direction, Speed
| 36***55 | Lines Group-Pilot; -Direction, Speed | 1 |
326-5735 Lines Gp-Pilot -Implement Control
| 32***35 | Lines Group-Pilot; -Implement Control | 1 |
326-5747 Lines Gp-Pump
| 32***47 | Lines Group-Pump | 1 |
326-5778 Lines Gp-Tilt Cylinder -Without Work Tool Positioner
| 32***78 | Lines Group-Tilt Cylinder; -Without Work Tool Positioner | 1 |
326-5737 Lines Gp-Tilt Cylinder -With Work Tool Positioner
| 32***37 | Lines Group-Tilt Cylinder; -With Work Tool Positioner | 1 |
223-8418 Manifold & Solenoid Gp-Control
| 22***18 | Manifold & Solenoid Group-Control; -Work Tool Positioner | 1 |
233-7128 Manifold Gp-Control -Quick Coupler
| 23***28 | Manifold Group-Control; -Quick Coupler | 1 |
295-7221 Motor & Mtg Gp-Hydraulic Fan
| 29***21 | Motor & Mtg Group-Hydraulic Fan | 1 |
258-2579 Motor & Mtg Gp-Hydraulic Fan
| 25***79 | Motor & Mtg Group-Hydraulic Fan | 1 |
356-1900 Motor Ar-Hydraulic Fan -Standard
| 35***00 | Motor Ar-Hydraulic Fan; -Standard | 1 |
356-1901 Motor Ar-Hydraulic Fan -Nacd
| 35***01 | Motor Ar-Hydraulic Fan; -Nacd | 1 |
307-3036 Motor Gp-Gear -Hydraulic Fan
| 30***36 | Motor Group-Gear; -Hydraulic Fan | 1 |
190-8084 Pump & Mtg Gp-Work Tool
| 19***84 | Pump & Mtg Group-Work Tool | 1 |
238-7642 Pump Gp-Gear -Work Tool
| 23***42 | Pump Group-Gear; -Work Tool | 1 |
326-5780 Tank & Mtg Gp-Hydraulic
| 32***80 | Tank & Mtg Group-Hydraulic | 1 |
326-5781 Tank Gp-Hydraulic
| 32***81 | Tank Group-Hydraulic | 1 |
326-5464 Valve & Mtg Gp-Control
| 32***64 | Valve & Mtg Group-Control | 1 |
336-1320 Valve Gp-Control
| 33***20 | Valve Group-Control; -Work Tool | 1 |
343-0869 Valve Gp-Pilot
| 34***69 | Valve Group-Pilot | 1 |
299-9119 Valve Gp-Pilot
| 29***19 | Valve Group-Pilot; -Work Tool | 1 |
295-1799 Valve Gp-Relief
| 29***99 | Valve Group-Relief; -Main | 1 |
195-9700 Valve Gp-Solenoid -12-Volt
| 19***00 | Valve Group-Solenoid; -12-Volt-Work Tool | 1 |
Implements
326-5498 Arm As-Lift
| 32***98 | Arm As-Lift | 1 |
222-5695 Bracket Gp-Support
| 22***95 | Bracket Group-Support | 1 |
Lubrication System
361-3334 Filter Gp-Engine Oil
| 36***34 | Filter Group-Engine Oil | 1 |
287-5377 Lines Gp-Engine Oil
| 28***77 | Lines Group-Engine Oil | 1 |
235-5895 Pump Gp-Engine Oil
| 23***95 | Pump Group-Engine Oil | 1 |
287-5665 Valve Gp-Engine Oil Relief
| 28***65 | Valve Group-Engine Oil Relief | 1 |
Machine Arrangement
326-5411 Chassis Ar
| 32***11 | Chassis Ar | 1 |
326-5257 Common Ar
| 32***57 | Common Ar | 1 |
326-5275 Control Ar-Machine -Aux Proportional Flow, 1-Speed
| 32***75 | Control Ar-Machine; -Auxiliary Proportional Flow, 1-Speed | 1 |
326-5274 Control Ar-Machine -Aux Proportional Flow, 1-Speed
| 32***74 | Control Ar-Machine; -Auxiliary Proportional Flow, 1-Speed | 1 |
326-5273 Control Ar-Machine -On, Off Auxiliary Control, 1-Speed
| 32***73 | Control Ar-Machine; -On, Off Auxiliary Control, 1-Speed | 1 |
326-5292 Conversion Ar -Italy
| 32***92 | Conversion Ar; -Italy | 1 |
326-5291 Conversion Ar-Machine -Outside Nacd
| 32***91 | Conversion Ar-Machine; -Outside Nacd | 1 |
326-5294 Conversion Ar-Machine -Germany
| 32***94 | Conversion Ar-Machine; -Germany | 1 |
356-1903 Conversion Ar-Machine -Germany, 2-Speed
| 35***03 | Conversion Ar-Machine; -Germany, 2-Speed | 1 |
326-5290 Conversion Ar-Machine
| 32***90 | Conversion Ar-Machine | 1 |
326-5279 Conversion Ar-Machine -Nacd
| 32***79 | Conversion Ar-Machine; -Nacd | 1 |
Operator Station
176-3900 Accumulator Gp-Refrigerant -Uncharged
| 17***00 | Accumulator Group-Refrigerant; -With Desiccant | 1 |
186-6190 Accumulator Gp-Refrigerant -Charged
| 18***90 | Accumulator Group-Refrigerant; -With Desiccant | 1 |
229-8747 Air Conditioner & Mounting Gp
| 22***47 | Air Conditioner & Mounting Group | 1 |
326-5566 Air Conditioner Ar
| 32***66 | Air Conditioner Ar | 1 |
218-6405 Air Conditioner Gp
| 21***05 | Air Conditioner Group | 1 |
320-1389 Arm Gp-Window Wiper
| 32***89 | Arm Group-Window Wiper | 1 |
236-4830 Armrest & Mounting Gp
| 23***30 | Armrest & Mounting Group | 1 |
236-4833 Armrest Gp
| 23***33 | Armrest Group | 1 |
216-6146 Box Gp-Storage
| 21***46 | Box Group-Storage | 1 |
218-6420 Box Gp-Storage -Literature
| 21***20 | Box Group-Storage; -Literature | 1 |
326-5400 Cab Ar
| 32***00 | Cab Ar | 1 |
326-5552 Cab Ar-Enclosed Rops -Mech Susp Seat
| 32***52 | Cab Ar-Enclosed Rops; -Mech Susp Seat | 1 |
326-5563 Cab Ar-Enclosed Rops -Heater, A/C
| 32***63 | Cab Ar-Enclosed Rops; -Heater, A/C | 1 |
326-5550 Cab Ar-Open Rops
| 32***50 | Cab Ar-Open Rops | 1 |
326-5551 Cab Ar-Open Rops -Mech Susp Seat
| 32***51 | Cab Ar-Open Rops; -Mech Susp Seat | 1 |
326-5404 Cab As
| 32***04 | Cab As | 1 |
326-5401 Cab Gp-Enclosed Rops
| 32***01 | Cab Group-Enclosed Rops | 1 |
326-5357 Compressor Gp-Refrigerant
| 32***57 | Compressor Group-Refrigerant | 1 |
218-6348 Condenser & Mtg Gp-Refrigerant
| 21***48 | Condenser & Mtg Group-Refrigerant | 1 |
231-4258 Control Gp-Handle -Lh
| 23***58 | Control Group-Handle; -Lh | 1 |
231-4260 Control Gp-Handle -Rh
| 23***60 | Control Group-Handle; -Rh | 1 |
231-4256 Control Gp-Handle -Lh
| 23***56 | Control Group-Handle; -Lh | 1 |
218-6485 Control Gp-Handle -Direction, Speed
| 21***85 | Control Group-Handle; -Direction, Speed | 1 |
218-6490 Control Gp-Handle -Work Tool
| 21***90 | Control Group-Handle; -Work Tool | 1 |
218-5972 Control Gp-Pilot Operated Hyd
| 21***72 | Control Group-Pilot Operated Hydraulic | 1 |
326-5265 Control Gp-Pilot Operated Hyd -Auxiliary
| 32***65 | Control Group-Pilot Operated Hydraulic; -Auxiliary | 1 |
218-5971 Control Gp-Pilot Operated Hyd
| 21***71 | Control Group-Pilot Operated Hydraulic | 1 |
326-5268 Control Gp-Pilot Operated Hyd
| 32***68 | Control Group-Pilot Operated Hydraulic; -Hydrostatic | 1 |
326-5264 Control Gp-Pilot Operated Hyd
| 32***64 | Control Group-Pilot Operated Hydraulic; -Work Tool | 1 |
218-6419 Cover Gp-Console -Without Air Conditioner, Heater
| 21***19 | Cover Group-Console; -Without Air Conditioner, Heater | 1 |
218-6440 Door & Mtg Gp-Cab -Polycarbonate
| 21***40 | Door & Mtg Group-Cab; -Polycarbonate | 1 |
223-0600 Door & Mtg Gp-Cab -Glass
| 22***00 | Door & Mtg Group-Cab; -Glass | 1 |
223-0616 Door Gp-Cab -Glass
| 22***16 | Door Group-Cab; -Glass | 1 |
276-3440 Door Gp-Cab -Polycarbonate
| 27***40 | Door Group-Cab; -Polycarbonate | 1 |
218-6431 Door Gp-Cab -Glass
| 21***31 | Door Group-Cab; -Glass | 1 |
276-3615 Door Gp-Cab -Polycarbonate
| 27***15 | Door Group-Cab; -Polycarbonate | 1 |
218-6394 Duct Gp-Cab Air
| 21***94 | Duct Group-Cab Air | 1 |
231-7325 Frame Gp-Window -Rh
| 23***25 | Frame Group-Window; -Rh | 1 |
231-7327 Frame Gp-Window -Lh
| 23***27 | Frame Group-Window; -Lh | 1 |
233-5632 Guard Gp-Rops/Fops
| 23***32 | Guard Group-Rops/Fops | 1 |
218-6400 Handhold Gp
| 21***00 | Handhold Group | 1 |
218-6118 Handle Gp-Modular
| 21***18 | Handle Group-Modular | 1 |
229-8746 Heater & Mtg Gp-Cab
| 22***46 | Heater & Mtg Group-Cab | 1 |
326-5555 Heater Ar-Cab
| 32***55 | Heater Ar-Cab | 1 |
218-6393 Heater Gp-Cab
| 21***93 | Heater Group-Cab | 1 |
231-8122 Housing As-Side -Air Conditioner, Heater
| 23***22 | Housing As-Side; -Air Conditioner, Heater | 1 |
326-5554 Installation Ar
| 32***54 | Installation Ar | 1 |
234-0774 Lever Gp-Governor
| 23***74 | Lever Group-Governor | 1 |
326-5406 Liner Gp-Cab
| 32***06 | Liner Group-Cab | 1 |
326-5757 Lines Gp-Air Conditioner
| 32***57 | Lines Group-Air Conditioner | 1 |
326-5745 Lines Gp-Heater
| 32***45 | Lines Group-Heater | 1 |
258-4230 Mirror Gp-Rear View
| 25***30 | Mirror Group-Rear View | 1 |
249-2910 Module Gp-Warning Indicator
| 24***10 | Module Group-Warning Indicator | 1 |
223-6537 Module Gp-Warning Indicator
| 22***37 | Module Group-Warning Indicator | 1 |
330-5012 Motor Gp-Window Wiper
| 33***12 | Motor Group-Window Wiper | 1 |
218-6370 Mounting Gp-Rops
| 21***70 | Mounting Group-Rops | 1 |
328-2270 Panel Gp-Instrument
| 32***70 | Panel Group-Instrument | 1 |
229-8744 Panel Gp-Side -Without Heater Or A/C
| 22***44 | Panel Group-Side; -Without Heater Or A/C | 1 |
218-6428 Panel Gp-Side
| 21***28 | Panel Group-Side | 1 |
325-8382 Pedal Gp-Governor
| 32***82 | Pedal Group-Governor | 1 |
327-8939 Pedal Gp-Governor
| 32***39 | Pedal Group-Governor | 1 |
326-5571 Platform Gp-Operator
| 32***71 | Platform Group-Operator | 1 |
218-6407 Seal Gp-Cab -Debris Barrier
| 21***07 | Seal Group-Cab; -Debris Barrier | 1 |
276-6020 Seat Belt Gp
| 27***20 | Seat Belt Group | 1 |
276-7277 Seat Belt Gp
| 27***77 | Seat Belt Group | 1 |
276-6019 Seat Belt Gp
| 27***19 | Seat Belt Group | 1 |
276-7276 Seat Belt Gp
| 27***76 | Seat Belt Group; -Suspension | 1 |
142-9305 Seat Gp -Suspension
| 14***05 | Seat Group; -Suspension | 1 |
218-5562 Seat Gp -Static
| 21***62 | Seat Group; -Static | 1 |
219-4380 Seat Gp-Adjustable
| 21***80 | Seat Group-Adjustable | 1 |
218-6380 Spring Gp-Gas -Cab, Door
| 21***80 | Spring Group-Gas; -Cab, Door | 1 |
173-3022 Visor Gp-Cab
| 17***22 | Visor Group-Cab | 1 |
166-2569 Visor Gp-Cab
| 16***69 | Visor Group-Cab | 1 |
224-7058 Window Gp-Cab -Upper, Rh
| 22***58 | Window Group-Cab; -Upper, Rh | 1 |
218-6411 Window Gp-Cab -Side
| 21***11 | Window Group-Cab; -Side | 1 |
195-6723 Window Gp-Cab
| 19***23 | Window Group-Cab; -Rear | 1 |
224-7057 Window Gp-Cab -Upper,Lh
| 22***57 | Window Group-Cab; -Upper,Lh | 1 |
Power Train
326-5787 Control Gp-Parking Brake
| 32***87 | Control Group-Parking Brake | 1 |
261-6392 Drive Gp-Track
| 26***92 | Drive Group-Track | 1 |
261-6393 Drive Gp-Track
| 26***93 | Drive Group-Track | 1 |
326-5739 Filter & Lines Gp-Hydraulic
| 32***39 | Filter & Lines Group-Hydraulic | 1 |
223-9974 Filter Gp-Oil -Hydraulic
| 22***74 | Filter Group-Oil; -Hydraulic | 1 |
326-5743 Lines Gp-Hydrostatic
| 32***43 | Lines Group-Hydrostatic | 1 |
248-1268 Manifold & Solenoid Gp-Control -Parking Brake
| 24***68 | Manifold & Solenoid Group-Control; -Parking Brake | 1 |
308-0421 Manifold Gp-Return
| 30***21 | Sealing Washer, Manifold Group-Return | 1 |
289-6355 Motor Gp-Piston
| 28***55 | Motor Group-Piston | 1 |
218-0918 Mounting Gp-Pump
| 21***18 | Mounting Group-Pump | 1 |
326-5260 Power Train Ar
| 32***60 | Power Train Ar | 1 |
354-6540 Pump & Mtg Gp-Hydrostatic -1-Speed
| 35***40 | Pump & Mtg Group-Hydrostatic; -1-Speed | 1 |
341-7642 Pump Gp-Piston
| 34***42 | Pump Group-Piston | 1 |
295-3290 Sprocket Gp
| 29***90 | Sprocket Group | 1 |
259-8194 Valve Gp-Solenoid -Parking Brake
| 25***94 | Valve Group-Solenoid; -Parking Brake | 1 |
Service Equipment And Supplies
238-7734 Film Gp -Un
| 23***34 | Film Group; -Un | 1 |
326-5261 Film Gp
| 32***61 | Film Group | 1 |
326-5688 Plate & Film Gp -International
| 32***88 | Plate & Film Group; -International | 1 |
195-6740 Plate & Film Gp
| 19***40 | Plate & Film Group | 1 |
326-5684 Plate & Film Gp
| 32***84 | Plate & Film Group | 1 |
Undercarriage
295-3211 Axle Gp-Bogie -Rear
| 29***11 | Axle Group-Bogie; -Rear | 1 |
280-5031 Axle Gp-Idler -Front
| 28***31 | Axle Group-Idler; -Front | 1 |
278-1255 Frame Gp-Undercarriage
| 27***55 | Frame Group-Undercarriage | 1 |
206-3807 Mounting Gp-Axle
| 20***07 | Mounting Group-Axle | 1 |
357-0296 Undercarriage Ar -1-Speed, Rh
| 35***96 | Undercarriage Ar; -1-Speed, Rh | 1 |
357-0297 Undercarriage Ar -1-Speed, Lh
| 35***97 | Undercarriage Ar; -1-Speed, Lh | 1 |
348-9700 Undercarriage Ar -1-Speed
| 34***00 | Undercarriage Ar; -1-Speed | 1 |
295-3210 Wheel Gp-Bogie
| 29***10 | Wheel Group-Bogie | 1 |
295-3230 Wheel Gp-Idler -Rear
| 29***30 | Wheel Group-Idler; -Rear | 1 |
280-5030 Wheel Gp-Idler -Front
| 28***30 | Wheel Group-Idler; -Front | 1 |
Work Tools
326-5750 Coupler Ar-Quick -Hydraulic
| 32***50 | Coupler Ar-Quick; -Hydraulic | 1 |
326-5700 Coupler Ar-Quick -Manual
| 32***00 | Coupler Ar-Quick; -Manual | 1 |
360-1363 Coupler Gp-Quick -Mechanical
| 36***63 | Coupler Group-Quick; -Mechanical | 1 |
360-1364 Coupler Gp-Quick -Hydraulic
| 36***64 | Coupler Group-Quick; -Hydraulic | 1 |
215-3963 Cylinder & Link Gp-Coupler -Rh
| 21***63 | Cylinder & Link Group-Coupler; -Rh | 1 |
215-3962 Cylinder & Link Gp-Coupler -Lh
| 21***62 | Cylinder & Link Group-Coupler; -Lh | 1 |
258-2538 Handle & Pin Gp-Coupler -Lh
| 25***38 | Handle & Pin Group-Coupler; -Lh | 1 |
258-2536 Handle & Pin Gp-Coupler -Rh
| 25***36 | Handle & Pin Group-Coupler; -Rh | 1 |
319-9480 Kit-Roading Plate & Mounting -Bucket
| 31***80 | Kit-Roading Plate & Mounting; -Bucket | 1 |
215-3957 Link Gp-Coupler
| 21***57 | Link Group-Coupler | 1 |
258-2537 Lock Gp-Quick Coupler -Lh
| 25***37 | Lock Group-Quick Coupler; -Lh | 1 |
175-4238 Lock Gp-Quick Coupler -Mechanical
| 17***38 | Lock Group-Quick Coupler; -Mechanical | 1 |
258-2535 Lock Gp-Quick Coupler -Rh
| 25***35 | Lock Group-Quick Coupler; -Rh | 1 |
Frequently asked questions
What engine is used in the Caterpillar 257B3?
The machine is powered by a Cat C3.4 DIT 4-cylinder turbocharged diesel engine, providing 71 net horsepower (52.9 kW).
What is the operating weight of this model?
The Caterpillar 257B3 has an operating weight of approximately 8,060 lb (3,656 kg).
What machine replaced the 257B3?
The provided documentation does not explicitly name a direct successor, though it lists the 299D3 as a related Caterpillar compact track loader.
What 257B3 owners discuss
What are the common engine performance and starting issues reported for the 257B3?
The C3.4 DIT engine may experience difficulty starting in very low temperatures. Potential causes for starting failures include clogged fuel filters, air or water contamination in the fuel system, defective fuel pumps, or dirty injection nozzles. Some operators also report that the engine can feel underpowered relative to its 8060 lb (3656 kg) operating weight.
What hydraulic behaviors and faults are frequently discussed regarding this model?
Users have reported persistent hydraulic sensor faults and electrical connection failures. Specific mechanical issues include lift arms failing to lift or drop, which can stem from damaged hydraulic pumps, defective control valves, faulty cylinders, or defective controls. Additionally, without regular maintenance, the system may be prone to fluid leaks.
What are the known issues regarding machine movement and visibility?
Operators have reported intermittent turning issues where the machine may turn well and then suddenly turn very slowly or not at all. There are also documented complaints regarding poor rear visibility, which can impact safety during reverse operations.
What undercarriage and wear patterns should be monitored?
The 257B3 utilizes a single-level suspension undercarriage with 12.6 in (320 mm) durable rubber tracks. Maintenance schedules suggest replacing the hydraulic tank breather and secondary engine air filter every 500 hours, and changing final drive oil every 500 hours.
What electrical or cabin environment issues are common?
Operators have noted that the cab can be particularly noisy during operation. Electrical troubleshooting often involves addressing fault code 600 and various sensor-related errors.
What should be checked when buying a used Caterpillar 257B3?
Verify the service history for engine replacements, as some units have been noted with replacement documentation. Check the condition of the tracks and undercarriage components. Because Caterpillar no longer manufactures this model, confirm there is no active official warranty; perform due diligence to ensure the machine is in good working condition to avoid high repair costs.
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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