Hyster A177, H40XL, H50XL, H60XL Repair Manual (P/N 4000 SRM 135)

This OEM Hyster service publication (4000 SRM 135) breaks down the essential technical data for 1990-era H40XL, H50XL, and H60XL lift trucks. It covers the A177, B177, and C177 build configurations across gasoline, LPG, and diesel powerplants. Whether you are chasing an electrical short or rebuilding the lift cylinder, this reference provides the exact factory baselines needed to get the truck out of the bay and back to work. Always verify equipment conditions, secure the load safely, and wear appropriate personal protective equipment before applying these specifications in the shop.

Engine and Hydraulic Systems Coverage

Accurate factory numbers take the guesswork out of complex overhauls. This manual outlines the critical mechanical parameters for the Mazda M4-121G, GM 4-181, Isuzu C240, and Isuzu 4JB1 engines. You will find complete reference data on firing sequences, valve clearances, and cooling system test pressures.

For the fluid power side, the hydraulic sections map out pump flow rates and steering system specifications specific to the C177 and A177 frames. Instead of hunting for control valve relief pressures, you get direct access to the required metrics to verify system health.

Specification Previews

Expect highly detailed teardown and assembly data. The included torque tables cover everything from drive plate assemblies to engine mounts—down to the specific 178 N.m requirement for the Isuzu 4JB1 motor mount bolts.

• Hydraulics: Details pump pressure settings, noting lift system relief pressures between 19.3 and 20.0 MPa alongside 12 dedicated hydraulic system blueprints for troubleshooting valve banks and line routing.
• Electrical: Contains 7 complete electrical wiring diagrams for all fuel variants. These schematics map out wire gauge ratings and color codes to speed up diagnostic tracing.

Note: This documentation serves purely as a contents overview and reference tool for technical specifications. It does not provide step-by-step repair or diagnostic instructions.