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This is the full workshop manual for the Caterpillar 259B3 compact track loader, model years 2011 to 2015. It covers every system on the machine: the C3.4 basic engine, fuel, cooling, air inlet and exhaust, lubrication, the complete hydraulic system, power train, final drives, undercarriage, electrical and starting, operator station, frame, implements and work tools. You get the actual factory test values, not guesswork - fan drive relief at 4725 kPa (685 psi), the 5 micron hydraulic filter spec, filter bypass valve opening at 345 kPa (50 psi), cooler bypass check valve at 172 kPa (25 psi). There is a dedicated Torque Specifications section, plus Service Equipment and Supplies so you know which tools the procedures call for before you pull the machine apart.
What's Inside This Caterpillar 259B3 Repair Manual
| System | Pages | Key Topics |
|---|---|---|
| Air Inlet and Exhaust System | 2 | Air Cleaner, Turbocharger, Exhaust Manifold |
| Basic Engine | 47 | Cylinder Head, Crankshaft, Camshaft, Pistons |
| Cooling System | 373 | Radiator, Water Pump, Thermostat |
| Electrical and Starting System | 474 | Starter, Alternator, Wiring Harness, Battery |
| Engine Arrangement | 497 | Engine Mounts, Engine Assembly |
| Frame and Body | 579 | Frame, Guards, Body Panels |
| Fuel System | 602 | Fuel Injection Pump, Injectors, Fuel Filter, Fuel Lines |
| Hydraulic System | 690 | Main Pump, Control Valve, Relief Valves, Cylinders, Hydraulic Filter |
| Implements | 1104 | Loader Linkage, Coupler, Bucket |
| Lubrication System | 1155 | Oil Pump, Oil Pan, Oil Filter |
| Machine Arrangement | 1200 | Component Locations, Machine Layout |
| Operator Station | 1216 | Cab, Controls, Monitor, Seat |
| Power Train | 1638 | Hydrostatic Drive, Final Drives, Drive Motors |
| Service Equipment and Supplies | 1974 | Special Tools, Fluids, Consumables |
| Torque Specifications | 1992 | Tightening Torques, Bolt Specifications |
| Undercarriage | 2040 | Tracks, Rollers, Idlers, Track Tension |
| Work Tools | 2146 | Attachments, Auxiliary Hydraulics |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Fan drive gear motor relief valve setting | 4725 +/- 100 kPa (685 psi) | p. 702 |
| Hydraulic oil filter rating | 5 micron | p. 703 |
| Filter bypass valve opening pressure | 345 kPa (50 psi) | p. 704 |
| Filter bypass switch closing pressure | 290 +/- 15 kPa (42 psi) | p. 704 |
| Hydraulic oil cooler bypass check valve opening | 172 kPa (25 psi) | p. 711 |
Caterpillar 259B3 Common Problems This Manual Covers
Hydraulic hose leaks with metal particles showing up in drained oil
The Hydraulic System section gives the filter housing O-ring replacement procedure and the test values to confirm the filter is doing its job: 5 micron rating, bypass valve opening at 345 kPa (50 psi), bypass switch closing at 290 kPa (42 psi). Test, find the wearing component, replace, then flush before the debris circulates.
Manual Section: Hydraulic SystemTrack tension sag out of range, tracks slipping off rollers
The Undercarriage section covers the tension adjustment procedure and correct sag measurement, plus inspection of the grease fitting, idlers and rollers. Replace a leaking tension fitting immediately - a track run loose for a week costs more in sprockets and rollers than the fitting ever will.
Manual Section: UndercarriageFinal drive oil contaminated with metal chips
The Power Train section has the final drive disassembly, inspection and assembly procedures for checking gears and bearings, plus fill and drain plug service with fresh O-rings. Chips in the drive oil mean the wear has already started, so open it up now instead of waiting for the drive to lock on a slope.
Manual Section: Power TrainHydraulic oil running hot or cooling fan not pulling its weight
The Hydraulic System section covers testing the fan drive gear motor against its relief setting of 4725 kPa (685 psi) and checking the oil cooler bypass check valve, rated at 172 kPa (25 psi). A stuck bypass valve sends hot oil around the cooler, and the Cooling System section handles the radiator side.
Manual Section: Hydraulic SystemFrequently Asked Questions
Does this manual give the torque specs for the final drive bolts on the 259B3?
Yes. There is a dedicated Torque Specifications section plus torque values inside the Power Train and Undercarriage procedures where the bolts actually get touched. That matters on this machine, because loose or worn final drive hardware is a known route to undercarriage damage. Follow the printed value and sequence, not what the last guy left them at.
I found metal chips in the drained hydraulic oil. Will this manual help me chase that down?
This is the manual's home turf. The Hydraulic System section walks you through pressure testing against factory values (5 micron filter spec, bypass valve opening at 345 kPa / 50 psi) so you can tell whether the filter has been bypassing dirty oil, then leads you to the worn component. Chips mean something is eating itself - find it before it takes the pump with it.
How do I reset the service interval and warning indicators on the 259B3?
The Electrical and Starting System and Operator Station sections cover the monitoring system, indicators and the reset procedures. One note from experience: do the actual service before you reset anything. A cleared hydraulic filter light with a plugged filter still in the housing is how oil ends up going around the element unfiltered.
My tracks keep sagging or walking off the rollers. Is track tensioning covered?
Yes, in the Undercarriage section - tension adjustment procedure, the correct sag range, and inspection of the grease fitting, idlers and rollers. Nine times out of ten on these machines it is a failed tension grease fitting or hardware that backed off. Adjust it to spec, because running tracks loose chews up the whole undercarriage fast.
Is this the right manual for my machine year, and does it cover the engine too?
It covers 259B3 machines built from 2011 to 2015 and includes the full engine side: Basic Engine, Fuel System, Cooling System, Air Inlet and Exhaust, and Lubrication System, alongside the machine systems. Check your serial number prefix against the manual coverage before ordering if your machine sits right at a model year boundary.
