Hyster B177 H40XL/H50XL/H60XL Forklift Service Manual Set, 1980s–1990s (P/N 899324)

The transmission and mast description sections explain system operation; their repair companions provide the corresponding component procedures, inspections and adjustments.

Engine coverage: Dedicated internal engine-repair chapters cover the Mazda M4-121G and Isuzu C240. GM 4-181 and Isuzu 4JB1 configurations appear in specifications and maintenance data, with GM gasoline/LPG wiring also included. Dedicated internal overhaul chapters for those two engines are outside this set. The C240 chapter covers injection-pump removal, installation and timing, but excludes full internal pump overhaul.

Earlier configurations and separate repair sections: Transmission repair coverage centers on the T41/T42/T43 design. Earlier transmissions are referred to separate publications, including 1300 SRM 8 and 1300 SRM 75. The A177-specific brake publication, 1800 SRM 157, and the steering control-unit overhaul section, 1600 SRM 257, are not included.

Text Search, Bookmarks and Download Contents

Search and diagram access: Most PDFs support text search and have named bookmarks. The two transmission PDFs have no searchable text and their bookmark labels are blank; Gauges has text-encoding problems that prevent reliable searching. Small wiring labels require zooming.

The ZIP download contains 27 printable PDFs totaling 553 pages, including eight original covers, two contents pages and six notes pages. These additional pages are already included in the total.

Engine, Drivetrain and Lift-System Repairs

The selected topics below form part of the section library; other material includes cab-window replacement and operator-restraint inspection.

• Engine and fuel systems: Mazda M4-121G and Isuzu C240 internal repair, engine removal, Mazda carburetor service, and IMPCO CA 50/CA 100 LPG repair and adjustment.

• Powershift transmission: Torque-converter replacement, pump/front-cover and clutch overhaul, differential and control-valve repair, MONOTROL pedal service, linkage and neutral-start adjustments, stall tests and pressure diagnosis.

• Hydraulics and steering: Gear-pump, main control-valve and auxiliary solenoid-valve repair, early/later flow-control and relief valves, steering-axle and cylinder service, pressure/flow checks, and bleeding.

• Masts and cylinders: Vista two-stage, free-lift, three-stage and four-stage mast repair, side-shift carriages, load rollers and shims, lift chains, header hoses, and lift/tilt cylinders.

• Brakes, axles and chassis: Service-brake and master-cylinder/booster repair, parking/inching linkage adjustment, drive-axle and wheel-bearing service, and counterweight, overhead-guard and powertrain/radiator removal.

• Electrical diagnosis: Mazda gasoline/LPG and Isuzu diesel fault finding, Delco starter repair, Delco/Motorola/Leece-Neville alternator service, gauge checks, and configuration-specific wiring and cable diagrams.

• Service reference data: Engine, electrical and hydraulic specifications, capacities, torque tables, mast/travel performance data, transmission test pressures, wear limits, adjustment data, maintenance schedules and fastener guidance.

The procedures are suited to trained, authorized lift-truck technicians equipped for hydraulic testing and lifting heavy assemblies.

Mast, cylinder, brake, LPG, and drivetrain repair involves raised or heavy assemblies, stored hydraulic pressure, flammable fuel, rotating parts, and electrical hazards. Use the manual's blocking, restraint, depressurization, ventilation, lifting, and isolation precautions.

Engine Repair and Specialist Tooling

The engine chapters contain step-by-step cylinder-head, valve, timing-gear, crankshaft, piston and liner procedures, together with lubrication-system and coolant-pump repair. Engine removal and installation are handled in the frame section.

The Isuzu C240 chapter identifies cylinder-liner remover 320901, special shaft 320902, and installation tool 320903. Mazda valve-guide replacement calls for Hyster tool 327686.

Fuel-System and Cooling Diagnosis

C240 fuel-system coverage distinguishes VE and PE4A injection pumps, with separate timing checks, fuel-system bleeding, and injector spray-pattern and opening-pressure tests. Injector inspection and testing require specialist equipment and training.

The LPG chapter covers filter/fuel-valve and vaporizer checks, mixture and governor adjustments, and carburetor disassembly. An incorrectly indexed LPG tank can damage its hose or fittings; the tank illustrations identify the alignment-pin arrangement.

Cooling-system coverage includes radiator restriction checks and cleaning, thermostat testing, water-pump checks, fan and shroud inspection, and troubleshooting.

Transmission Variants and Pressure Diagnosis

For the primary H40XL/H50XL/H60XL models, the transmission assignment is T43; the shared publications also cover T41 and T42 applications. Pressure references distinguish pump, forward-clutch, reverse-clutch, converter, cooler and modulator test ports, with separate data for early horizontal-filter transmissions.

The drive-axle chapter refers pre-1984 transmission work to the earlier repair publication. The included T41/T42/T43 volumes also distinguish the earlier left-side-filter design from the later top-mounted-filter transmission.

A torque-converter hub that is not fully engaged with the pump can damage the transmission oil pump when the housings are brought together. The repair volume illustrates the mounting relationship and clearance checks.

Hydraulic Leak Checks and Mast Configurations

Lift- and tilt-cylinder leak checks distinguish cylinder-seal leakage from main control-valve leakage, helping locate the affected assembly before removal. Gear-pump illustrations identify bushing and seal orientation, housing alignment marks, and wear-inspection points.

The mast repair section separates earlier side-shift carriages from the 1993-and-later design. It adds lift-chain, load-roller, carriage and mast adjustments, plus header-hose arrangements for the different Vista mast configurations.

Steering coverage includes control-unit operation and fault diagnosis, steering-column removal/installation, pressure checks and air removal. Steering-pressure specifications differ across the included specification, steering-system and axle sections.

Brake Assemblies, Axles and Chassis

The H60XL brake section distinguishes 260 mm and 310 mm service-brake assemblies; the larger assembly requires different drive wheels and tires. Drum, shoe and wheel-cylinder procedures are accompanied by parking-brake, master-cylinder, booster and inching/brake-linkage adjustments.

Drive-axle coverage includes axle-housing mounts, hub seals and wheel bearings. The frame section covers counterweight, overhead-guard, engine/transmission and radiator removal, along with tank inspection and repair.

Wiring, Starting and Charging Tests

The diagram packet includes the Hydraulic System Schematic, Transmission Schematic, and Instrument Panel Electrical Diagram. Electrical sheets include the Mazda Engine, Gasoline/LPG Wiring Schematic, Diesel Engine Wiring Schematic, and GM Engine, Gasoline/LPG Wiring Diagram, with cable diagrams for standard and safety-rated configurations. Applicable sheets include wire-color and conductor-gage keys.

Mazda electrical coverage distinguishes contact-point and HEI distributors, along with separate and integral regulators. Isuzu coverage adds glow-plug and cold-start circuits and alternators with or without a vacuum pump.

Component checks cover starter armatures, rotors, stators, diodes and brush assemblies. Low- and high-output charging tests help distinguish alternator, regulator and wiring faults before component removal.

Examples of Valve and Clutch Clearances

For the Mazda M4-121G, the engine chapter specifies intake and exhaust valve clearance of 0.30 mm (0.012 in) with the engine warm. The Isuzu C240 chapter specifies 0.45 mm (0.018 in) for both intake and exhaust valves with the engine cold.

The T41/T42/T43 repair volume specifies an assembled-clutch clearance of 0.64–2.74 mm (0.025–0.108 in), alongside its clutch inspection and reassembly procedures.