Bobcat 963 Skid Steer Loader Service Manual – Perkins 1004.40T Diesel Engine & Hydrostatic Drive Repair Guide

Description

Bobcat 963 Skid Steer Loader Service Manual – Complete Workshop Repair Guide

This is the comprehensive Bobcat 963 Skid Steer Loader Service Manual, document number 6724545 (initial release November 1997, revised through March 1999). At 467 pages, it is the definitive workshop reference for mechanics performing repair, overhaul, adjustment, and diagnostic work on the Bobcat 963 loader equipped with the Perkins 1004.40T diesel engine. Every major system is covered with removal and installation procedures, disassembly and assembly steps, inspection criteria, torque values, troubleshooting charts, and detailed illustrations.

File Details

• Manual Type: Service / Workshop Manual
• Brand: Bobcat (Melroe / Ingersoll-Rand)
• Model: 963 Skid Steer Loader
• Engine: Perkins 1004.40T Diesel
• Document Number: 6724545
• Publication Date: November 1997
• Latest Revision: March 1999
• Page Count: 467
• File Format: PDF
• Language: English
• Systems Covered: Engine, Hydraulic, Hydrostatic, Drive, Electrical, Main Frame, A.H.C.

Chapters Covered

• Preventive Maintenance – Service schedule, lifting and blocking, towing, lubrication, air cleaner, fuel system, engine lubrication, cooling system, alternator belt, hydraulic/hydrostatic fluid service, spark arrestor muffler, tire maintenance, chaincase, fan gearbox, Bob-Tach, remote start switch
• Hydraulic System – Hydraulic control valve, lift cylinder, tilt cylinder, hydraulic pump, BICS valve, bucket position valve, main relief valve, lift arm by-pass control valve, pedal interlock linkage, control pedals, front side panel, hydraulic filter, fluid reservoir
• Hydrostatic System – Hydrostatic pump, hydrostatic motor, hydrostatic controller, charge pressure, drive belt, belt tensioner, idler pulley, steering levers, steering linkage, oil cooler, motor cover
• Drive System – Brake/two speed block, parking brake, parking brake pedal, axle seal, axle bearings and sprocket, drive chains, chaincase covers, reduction gearcase, chaincase fluid
• Main Frame – Seat bar, operator cab gas cylinder, operator cab, operator seat, Bob-Tach, lift arms, rear grill, rear door, front fuel tank, rear fuel tank
• Electrical System – Battery, alternator, starter, instrument panel, front lights, relay switches, electrical system information
• Engine Service – Engine removal and installation, engine speed control, muffler, air cleaner housing, coolant recovery tank, radiator, fan drive tension pulley, fan gearbox, blower housing, blower fan, flywheel, engine mounting bracket, valve clearance, fuel lift pump, fuel injection pump, fuel injector nozzles, intake manifold, exhaust manifold, cylinder head, rocker shaft, valves and guides, timing case, camshaft and tappets, pistons and connecting rods, crankshaft and bearings, cooling system, engine oil cooler, lubrication system, engine block, turbocharger
• System Analysis – BICS system controller, BICS troubleshooting, seat bar sensor, seat sensor, traction lock, RPM sensor, sender and sensor service checks, service codes, BOSS diagnostic tool, BOSS instrument panel, BOSS unit, PWM module, PWM troubleshooting, PWM control handle, PWM electric solenoid, electrical/hydraulic controls reference
• Specifications – Loader specifications, engine specifications, hydraulic connection specifications, hydraulic/hydrostatic fluid specifications, torque specifications for bolts, decimal and millimeter equivalents, U.S. to metric conversion
• Advanced Hand Control System (A.H.C.) – A.H.C. components, actuator voltage test, handle control unit, switch handle, A.H.C. handle, A.H.C. steering lever, actuators, BICS valve, hydraulic control valve

This Bobcat 963 service manual provides the technician with a complete repair framework. Each section opens with a description of how the system works, followed by diagnostic charts that map symptoms to probable causes, then step-by-step removal and installation procedures. Critical fasteners and adjustments are accompanied by torque specifications and service limits. The engine chapter alone spans dozens of pages, covering everything from valve clearance adjustment to crankshaft re-grind data, piston ring end gaps, connecting rod inspection, and turbocharger service. The hydrostatic section details the tandem pump, motor, and controller with charge pressure test values and neutral adjustment procedures. Wiring schematics, hydraulic circuit diagrams, and exploded parts views are included throughout.

Engine & Powertrain Coverage

The Perkins 1004.40T diesel engine is covered in exhaustive detail. The manual includes the complete engine torque sequence for cylinder head bolts (short bolts 150°, medium bolts 180°, long bolts 210°), main bearing torque steps (65, 125, 185 ft-lbs), connecting rod nut torque (45 ft-lbs then 92 ft-lbs), and flywheel-to-crankshaft bolt torque (77 ft-lbs). Valve clearance is specified at 0.008 inch intake and 0.018 inch exhaust, with a four-step adjustment sequence. Cylinder liner inspection and installation procedures are given, along with piston ring end gap specifications and piston height measurement. The fuel injection pump timing procedure is described with a timing pin, and injector nozzle testing is covered with working pressure (4263 PSI) and spray pattern evaluation.

Hydraulic & Hydrostatic Systems

The hydraulic system chapter covers the main relief valve adjustment (first stage 3025 PSI, second stage 3375 PSI), load check valves, port relief valves, anti-cavitation valves, and the BICS valve assembly. The hydrostatic section provides charge pressure specifications (left pump 319 PSI, right pump 406 PSI), controller pressure (406 PSI), and a detailed neutral adjustment procedure for the steering linkage. Hydrostatic pump disassembly and assembly includes servo piston adjustment, swashplate bearing inspection, and timing procedure for equalizing output pressure between pumps. Motor disassembly covers control lens, cylinder block, pistons, and flushing valve service.

Electrical & Advanced Hand Control

The electrical chapter covers battery service, alternator testing (output, rectifier, regulator), starter disassembly and testing, and the standard instrument panel. The BICS (Bobcat Interlock Control System) is documented with troubleshooting charts, sensor tests using the MEL1428 sensor tester, and seat bar/seat sensor circuit tests. The BOSS diagnostic tool procedure is included for fault code retrieval. The Advanced Hand Control System (A.H.C.) section covers actuator voltage tests, handle control unit testing, switch handle wiring, and A.H.C./PWM controller diagnostics with a complete voltage chart for every pin on the C431 connector. Service codes for engine coolant temperature, oil pressure, engine speed, air filter, battery, fuel level, and hydrostatic conditions are listed with display readings and conditions.

Specifications & Service Data

The specifications chapter provides loader dimensions, rated operating capacity (3000 lbs), tipping load (6000 lbs), operating weight (9900 lbs), travel speed (5.2 MPH low, 9.0 MPH high), hydraulic pump capacity (26.2 GPM at 3575 RPM), system relief pressures, cylinder bore and rod diameters, and fluid capacities (cooling system 20 qts, fuel 32.5 gals, engine oil 8 qts, hydraulic reservoir 28 qts, chaincase 20.5 gals). Engine specifications include bore (3.937 inch), stroke (5.000 inch), displacement (243 cu. in.), compression ratio (17.25:1), firing order (1-3-4-2), and valve timing data. Hydraulic connection torque values for flare fittings, O-ring face seals, O-ring flare fittings, and port seal fittings are provided with hex-flat tightening methods. Standard torque tables for SAE and metric bolts are included.

Who This Manual Is For

This Bobcat 963 repair manual is written for professional mechanics, fleet maintenance technicians, and experienced owner-operators who need to perform major repairs, engine overhauls, hydrostatic transmission service, hydraulic diagnostics, or electrical troubleshooting. It assumes access to common hand tools, torque wrenches, hydraulic testers, and the special tools listed in the procedures (including MEL-prefixed tool numbers). The procedures are detailed enough for a competent technician to rebuild the engine, reseal the hydrostatic motors, adjust the main relief valve, or diagnose a BICS fault without factory support.

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With this Bobcat 963 Skid Steer Loader Service Manual, you can confidently tackle engine overhauls, hydrostatic pump and motor repairs, hydraulic valve adjustments, electrical diagnostics, and complete machine disassembly and reassembly. The manual gives you the correct torque values, service limits, and step-by-step procedures that prevent costly mistakes—over-torquing a cylinder head, misadjusting a relief valve, or damaging a hydrostatic component. Delivered as an instant PDF download, it is printable on any standard printer and viewable on laptops, tablets, or smartphones in the workshop. No shipping, no waiting—start your repair today.