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This is the compiled Caterpillar SIS repair set for the 267B, 277B and 287B Multi Terrain Loaders (serial prefixes 267B CYC00001-Up, 277B/287B MDH00001-Up) with the Cat 3044C engine. You get the core factory modules: Specifications (RENR4885), Systems Operation (RENR4886), Testing and Adjusting (RENR4887) and the Disassembly and Assembly books (RENR4883/4884/4888), plus hydraulic and electrical schematics with harness connector locations. These machines are diagnosed with a gauge, not a scan tool, and this set prints the numbers you test against: main relief, line reliefs, pilot pressure, accumulator charge and charge pump flow. It also covers the hydrostatic drive pump and motors, final drives, rubber track undercarriage, cooling, fuel injection and the cab. Sections carry Cat publication dates from 2004 to 2013.
What's Inside This Caterpillar 267B, 277B, 287B Repair Manual
| System | Pages | Key Topics |
|---|---|---|
| Air Inlet and Exhaust System | 2-58 | Turbocharger, Inlet and Exhaust Manifolds, Air Cleaner |
| Basic Engine | 59-479 | Cat 3044C Engine, Cylinder Head, Crankshaft, Pistons, Flywheel |
| Cooling System | 480-595 | Water Pump, Thermostat, Radiator, Hydraulic Fan Motor |
| Electrical and Starting System | 596-1728 | Alternator, Starting System, Batteries, Machine Security System, Product Link, EquipmentManager, Air Conditioning R134a |
| Engine Arrangement | 1729-1811 | Engine Mounting and Arrangement |
| Frame and Body | 1812-1830 | Frame, Body Panels |
| Fuel System | 1831-1944 | Injection Pump, Injectors, Fuel Filter, Priming |
| Hydraulic System | 1945-2418 | Main Relief Valve Test and Adjust, Line Relief Valve Test and Adjust, Pilot System Pressure Test, Pump Flow Test, Accumulator Test and Charge, Troubleshooting |
| Implements | 2419-2445 | Loader Linkage, Work Tool Mounting |
| Lubrication System | 2446-2511 | Engine Oil Pump, Oil Filter, Oil Relief Valve |
| Machine Arrangement | 2512-2524 | Machine Arrangement and Layout |
| Operator Station | 2525-3167 | Cab, Controls, Air Conditioning, Seat |
| Power Train | 3168-3462 | Hydrostatic Drive Pump, Drive Motors, Final Drives |
| Service Equipment and Supplies | 3463-3481 | Service Tooling and Supplies |
| Undercarriage | 3482-3597 | Rubber Track, Idlers, Rollers, Track Tension |
| Work Tools | 3598-3601 | Work Tool Hydraulics and Mounting |
| Torque Specifications | 3602-3651 | Metric ISO Fasteners, English SAE Fasteners, Fittings, Plugs, Hose Clamps |
| Schematic | 3652-3734 | Multi Terrain Loader Hydraulic Schematics, Standard Electrical Schematics, Machine Harness Connector and Component Locations, Graphic Symbol Legends |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| 267B, 277B, 287B | ||
| Main relief valve, work tool | 23000 +/- 700 kPa (3336 +/- 102 psi) at high idle | p. 2089 |
| 287B HF XPS | ||
| Main relief valve, work tool | 23000 +/- 1000 kPa (3336 +/- 145 psi) at high idle | p. 2089 |
| All Models | ||
| Line relief, lift cylinder head raise | 27600 +/- 700 kPa (4003 +/- 102 psi) | p. 2100 |
| Line relief, tilt circuit | 24500 +/- 700 kPa (3554 psi) and 27600 +/- 700 kPa (4003 psi) by position | |
| Pilot system pressure | 3200 +/- 200 kPa (465 +/- 29 psi) at low idle | p. 2128 |
| Pilot system pressure | 3800 +/- 350 kPa (551 +/- 51 psi) at high idle | |
| Pilot accumulator, properly charged | 900 +/- 100 kPa (130 +/- 15 psi) | |
| Charge pump minimum flow | 32 L/min (8.45 US gpm) at 18000 +/- 1000 kPa outlet, 2000 +/- 10 rpm, oil 45 +/- 5 C | p. 2139 |
| Main relief valve locknut and cap torque | 24 +/- 3 N m (18 +/- 2 lb ft) | |
| Serial prefixes | 267B CYC00001-Up; 277B and 287B MDH00001-Up | |
| Engine fitted | Caterpillar 3044C | |
| 267B, 277B, 287B standard | ||
| Line relief, auxiliary circuit | 24500 +/- 700 kPa (3554 psi) | |
| 287B HF XPS high flow | ||
| Line relief, auxiliary circuit | 31000 +/- 700 kPa (4496 psi) | |
Caterpillar 267B, 277B, 287B Common Problems This Manual Covers
Loader arms are slow, weak, or drift down under load.
Test before you guess. The Testing and Adjusting section (RENR4887) gives the main relief spec of 23000 +/- 700 kPa, the lift cylinder head end line relief of 27600 +/- 700 kPa, and the pump flow test that separates a mis-set valve from a worn pump.
Manual Section: Testing and Adjusting - Main Relief Valve, Line Relief Valves, Pump Flow Test p. 2065Machine pulls to one side or one track is slow.
This is usually hydrostatic pump or drive motor wear on one side. The Systems Operation module explains how the hydrostatic loop works, and the Disassembly and Assembly books cover pulling and rebuilding the drive pump, drive motors and final drives step by step.
Manual Section: Systems Operation (RENR4886) / Disassembly and Assembly - Hydrostatic Drive p. 3168Rubber track wearing fast, walking off, or derailing on turns.
Nine times out of ten it is tension or worn idlers and rollers. The Undercarriage coverage gives the track tension adjustment procedure plus removal and installation of the rubber track, idlers and rollers, so you can fix the cause instead of buying tracks twice.
Manual Section: Undercarriage - Rubber Track, Idlers, Rollers, Track Tension p. 3482Overheating during heavy work in warm weather.
These machines cool through a hydraulically driven fan, so a lazy fan motor overheats the machine even with a clean radiator. The Cooling System coverage handles the hydraulic fan motor, water pump, thermostat and radiator so you test the fan circuit before condemning the core.
Manual Section: Cooling System - Hydraulic Fan Motor, Water Pump, Thermostat, Radiator p. 480Frequently Asked Questions
What should the main relief pressure be on a 277B?
The work tool main relief is 23000 +/- 700 kPa (3336 +/- 102 psi) at high idle for the 267B, 277B and 287B. The 287B HF XPS runs 23000 +/- 1000 kPa. The Testing and Adjusting section walks you through the test port hookup, the adjustment procedure and the 24 +/- 3 N m (18 +/- 2 lb ft) locknut and cap torque when you button it back up. p. 2089
Is my 287B the high flow XPS, and does it matter?
It matters a lot for the auxiliary circuit. The standard 267B/277B/287B auxiliary line relief is 24500 +/- 700 kPa, but the 287B HF XPS is set at 31000 +/- 700 kPa (4496 psi). Set an XPS to the standard number and your high flow attachments will be down on power; set a standard machine to XPS pressure and you are overstressing the circuit. The manual lists both specs so you test against the right one.
What pilot pressure should I see?
Pilot system pressure is 3200 +/- 200 kPa (465 +/- 29 psi) at low idle and 3800 +/- 350 kPa at high idle. A properly charged pilot accumulator reads 900 +/- 100 kPa (130 +/- 15 psi). Low pilot pressure gives you lazy or dead joystick response before anything else fails, so this is one of the first tests worth running. p. 2128
What is the charge pump flow spec?
Minimum acceptable charge pump flow is 32 L/min (8.45 US gpm) measured at 18000 +/- 1000 kPa outlet pressure, 2000 +/- 10 rpm, with the oil at 45 +/- 5 C. The Testing and Adjusting section gives the flow meter hookup and conditions. A tired charge pump starves the hydrostatic loop and shows up as weak or jerky travel long before the drive pump itself dies. p. 2139
Does this cover my serial number, and what about the 247B or 257B?
Coverage is 267B from serial prefix CYC00001-Up and 277B/287B from MDH00001-Up. The core machine sections are titled for the 267B, 277B and 287B only, so if you have a 247B or 257B this is not your set. Reference modules for optional equipment (Machine Security System, Product Link, EquipmentManager) are included, but those systems are only on machines that were ordered with them.
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