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This is the full factory repair set for the Caterpillar 277C Multi Terrain Loader, serial prefix JWF00001-UP (2007 to 2012 machines): Systems Operation, Testing and Adjusting, and Disassembly and Assembly across 19 PDF sections and 3,559 pages. You get the actual test procedures with pass/fail numbers - main relief at 23000 kPa (3335 psi), lift and tilt line relief at 24500 kPa (3553 psi), rack back at 27600 kPa (4003 psi), pilot pressure at 3500 kPa (500 psi) - plus a dedicated Torque Specifications section, full electrical schematics with component and connector locations, and undercarriage service for the rubber track system. The Testing and Adjusting content is the shared C-family book, so procedures cover the 277C alongside the 277C2, 287C, 287C2, and 297C.
What's Inside This Caterpillar 277C Repair Manual
| System | Pages | Key Topics |
|---|---|---|
| Air Inlet and Exhaust System | 2-79 | Turbocharger, Air Cleaner, Exhaust |
| Basic Engine | 80-710 | Engine Disassembly and Assembly, Head, Block, Crankshaft |
| Cooling System | 711-854 | Radiator, Water Pump, Thermostat, Fan Speed 1100-2690 RPM Checks |
| Electrical and Starting System | 855-1364 | Alternator, Starter, Batteries, Harnesses, Circuit Tests |
| Engine Arrangement | 1365-1482 | Engine Mounting and Arrangement |
| Frame and Body | 1483-1497 | Frame, Covers, Guards, ROPS |
| Fuel System | 1498-1667 | Injection Pump, Injectors, Filters, Fuel Testing |
| Hydraulic System | 1668-2315 | Main Relief 23000 kPa and Line Relief Test and Adjust, Pilot System, Accumulator, Pumps, Valves, Cylinders |
| Implements | 2316-2336 | Loader Arms, Bucket, Quick Coupler |
| Lubrication System | 2337-2422 | Oil Pump, Filters, Lubrication Routing |
| Machine Arrangement | 2423-2440 | Overall Machine Arrangement |
| Operator Station | 2441-2959 | Cab, Controls, Seat Bar Interlock, Display |
| Power Train | 2960-3266 | Hydrostatic System Test and Adjust, Drive Motors, Charge Circuit |
| Service Equipment and Supplies | 3267-3283 | Special Tools, Service Supplies |
| Undercarriage | 3284-3417 | Rubber Track, Rollers, Idlers, Track Tension |
| Work Tools | 3418-3426 | Work Tool Hydraulics, Xps High Flow, Attachment Service |
| Torque Specifications | 3427-3473 | Standard Metric and Inch Tightening Torques, Fittings and Hose Clamps |
| Schematic | 3474-3559 | Systems Operation, Testing and Adjusting, Disassembly and Assembly |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Main Relief Valve Setting (Standard Flow) | 23000 ± 700 kPa (3335 ± 102 psi) | p. 1816 |
| Main Relief Valve Setting (High Flow XPS) | 23000 ± 1000 kPa (3335 ± 145 psi) | p. 1816 |
| Hydraulic Oil Operating Temperature | 50° ± 10°C (122° ± 18°F) | p. 1816 |
| Line Relief Valve Setting (Lift) | 24500 ± 700 kPa (3553 ± 102 psi) | p. 1827 |
| Line Relief Valve Setting (Rack Back) | 27600 ± 700 kPa (4003 ± 102 psi) | p. 1828 |
| Line Relief Valve Setting (Tilt) | 24500 ± 700 kPa (3553 ± 102 psi) | p. 1828 |
| Line Relief Valve Setting (Auxiliary Standard) | 24500 ± 700 kPa (3553 ± 102 psi) | p. 1828 |
| Line Relief Valve Setting (Auxiliary XPS) | 31000 ± 700 kPa (4496 ± 102 psi) | p. 1828 |
| Accumulator Precharge Pressure | 900 ± 100 kPa (130 ± 15 psi) | p. 1831 |
| Pilot Pressure (Test) | 3500 ± 200 kPa (500 ± 30 psi) | p. 1835 |
| Pilot Pressure for Work Tool (Low Idle) | 2750 ± 200 kPa (399 ± 29 psi) | p. 1841 |
| Pilot Pressure for Work Tool (High Idle) | 3300 ± 200 kPa (479 ± 29 psi) | p. 1841 |
| Fan Speed (MIN) | 1100 ± 50 RPM | p. 1844 |
| Fan Speed (MAX) | 2690 ± 50 RPM | p. 1844 |
| Charge Pump Outlet Pressure (Test) | 18000 ± 1000 kPa (2610 ± 145 psi) | p. 1850 |
Caterpillar 277C Common Problems This Manual Covers
Track drive lugs misfeeding on the drive sprocket, chewing up the track
This usually traces back to incorrect track tension or worn sprocket rings and roller sleeves letting the lugs ride out of register. The Undercarriage section gives the tension adjustment procedure and the inspection points for sprocket and roller wear, so you can catch it before the track is scrap.
Manual Section: Undercarriage p. 3284Weak or slow hydraulics with no obvious leak
Before condemning a pump, test against the book numbers. The Hydraulic System testing procedures walk you through checking main relief at 23000 kPa, charge pump outlet at 18000 kPa with the engine at 2000 rpm, and standby pressure at 2900 kPa, all with oil at the specified 50 C test temperature.
Manual Section: Hydraulic System p. 1668Injury risk from stored hydraulic pressure during component removal
People get hurt cracking fittings on a system that still holds pressure, and the accumulator keeps a 900 kPa precharge even shut down. The Hydraulic System section covers the pressure release procedure that belongs at the start of every hydraulic job on this machine, before any line comes loose.
Manual Section: Hydraulic System p. 1668Engine misfire or no-start after fuel injection pump work
Nine times out of ten the timing marks were not aligned correctly during pump installation, or worn mounting hardware let the gear shift. The Fuel System disassembly and assembly coverage shows the correct mark alignment and installation sequence so the pump goes back on right the first time.
Manual Section: Fuel System p. 1498Frequently Asked Questions
Will this manual match my 277C's serial number?
It covers the JWF prefix, serial JWF00001-UP, which is the standard 277C build from 2007 to 2012. Check the plate inside the cab door frame before you buy. If your machine carries a different prefix, this is not your book.
Does it have the hydraulic pressure specs I need to actually test the system?
Yes, and that is the main reason to own it. Main relief is 23000 kPa (3335 psi) for both standard flow and High Flow XPS, lift and tilt line relief run 24500 kPa (3553 psi), rack back is 27600 kPa (4003 psi), and the auxiliary XPS line relief is 31000 kPa (4496 psi). It also gives you the test conditions, like bringing the oil to 50 C before you trust any gauge reading. p. 1815
My machine has the High Flow XPS package. Is that covered or just standard flow?
Both. The Testing and Adjusting section gives separate numbers where they differ: the high flow auxiliary circuit test spec is 121 L/min (32 US gpm) at 2800 rpm, the XPS auxiliary line relief is 31000 kPa (4496 psi), and the work tool pilot pressures are listed at low and high idle. Standard flow work tool pump minimum is 54.3 L/min for comparison.
Is this a 277C-only manual or a shared book?
Honest answer: the Testing and Adjusting content is Caterpillar's shared C-family publication, covering the 277C, 277C2, 287C, 287C2, and 297C. That is how Cat published it, not a shortcut on our end. The procedures apply to your JWF-prefix 277C, and where models differ the manual calls out which spec belongs to which machine.
Does this cover DEF or emissions aftertreatment service?
No, because the machine has none. The 277C is pre-Tier 4 Final, so there is no DEF tank, no SCR, no regen procedures to worry about. Engine coverage is the straightforward stuff: air inlet and exhaust, fuel system, cooling, lubrication, and basic engine disassembly and assembly.
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