Komatsu FD35–50A Forklift Parts: A Practical Guide to the −7 and −8 Series
Komatsu FD35–50A forklift parts need more identification than “a four- or five-ton Komatsu.” This guide covers the older −7 and −8 diesel families represented in our catalog, including application ranges written as FD35–50A. Keep every letter in your truck's complete model: FD45T-8, FD50A-7 and other variants are not interchangeable descriptions. Engine, axle, transmission and mast details can change the correct component. The Komatsu forklift parts collection is a starting point; the nameplate and original part number narrow it to your machine.
These trucks work in yards, loading areas and industrial facilities where dust, frequent direction changes and repeated steering cycles make maintenance important. The guide separates symptoms that can look alike and explains what evidence to collect before ordering. Listed applications come from individual product records, not a blanket compatibility claim. A qualified technician should handle testing and repairs, and any unsafe truck should remain out of service.
Komatsu FD35–50A filters: identify the circuit first
A diesel that loses power or produces more smoke under load may have restricted intake airflow, but fuel delivery, injection condition and other engine faults can also be involved. Inspect the filter housing, intake ducting and any restriction indicator before deciding the engine needs internal work. An element that does not seal properly can admit dust even when it looks clean.
Air Filter 600-182-1310 is listed for the FD35–70-7 range. It is not evidence of fitment for a −8 housing. Compare the element's dimensions, end seals and housing reference; do not substitute a visually similar filter or operate without it to “test” engine performance.
Hydraulic filters protect a different circuit. Hydraulic Return Filter 90584-43001-71 has catalog applications including FD35–50A-7 and FD35–50A-8. Confirm the installed housing and element rather than assuming any hydraulic filter serves the same location. A return element is not automatically a replacement for a suction strainer. If oil contains metal or heavy contamination, identify the source as part of the repair. Browse forklift filters for the correctly identified system.
Steering looseness versus heavy steering
A clunk or delayed wheel response can come from mechanical clearance in the steer axle. Heavy or inconsistent steering can instead involve hydraulic supply, cylinder leakage or mechanical binding. That distinction matters: fitting cylinder seals will not remove a worn kingpin's clearance, while replacing a pin will not restore inadequate hydraulic assistance.
The catalog lists King Pin 3EC-24-31670 for FD35–50A-7. The associated King Pin Kit 3EC-24-05020 is listed with the serial range 100001–195017. Treat that range as a fitment checkpoint, not optional information. Before choosing the individual pin or kit, inspect the bearings, bushes and housing and confirm exactly what the kit includes.
For a confirmed steering-cylinder leak, Steering Cylinder Repair Kit NP23353-05155 is listed for FD40–50A-7. Check the cylinder identification and rod condition. A pitted rod can damage new seals quickly, and a seal kit cannot correct a bent rod or worn mounting joint. These −7 listings should not be extended to −8 trucks without confirmation. Further options are in steering parts.
Brake fluid loss: inspect the wheel end, not just the reservoir
Falling brake-fluid level, a changed pedal feel or wetness around a brake assembly needs prompt investigation. A wheel-cylinder leak is one possibility; pipes, hoses, the master cylinder and other components must also be checked. Repeated topping-up can hide a leak while braking performance deteriorates. Do not continue operating a truck with a suspected brake defect.
Wheel Cylinder 91946-00600 lists Komatsu reference 3EC-30-31110 and FD35–50A-7/−8 applications among several brands. The cross-reference alone is not enough: confirm the fitted brake assembly, cylinder bore, mounting, line connection and any side-specific requirements. If fluid has reached friction material, the repair must address that contamination as well. Bleeding, adjustment and the final operational checks should follow the applicable service instructions.
Mast tilt creep is not the same as forks lowering
Describe the movement precisely. When the mast rotates forward with the control in neutral, the tilt circuit needs investigation. When the carriage descends while the mast angle stays constant, the lift circuit is involved. External leakage, cylinder bypass and valve leakage are different possibilities. A drift complaint alone does not establish which seal has failed.
Tilt Cylinder Seal Kit 3EC-64-05020 is listed for FD35–50A-7/−8. Verify the cylinder number, rod and bore condition, and any previous cylinder replacement before ordering. Do not use this tilt kit as a generic lift-cylinder kit. Testing must follow the service procedure with the truck secured; never work beneath unsupported forks or put a hand near a suspected hydraulic pinhole leak.
Slow lift: distinguish the hydraulic pump from its supply and controls
Slow lifting, particularly after the oil warms, can involve pump wear, an oil-supply restriction, air entry, valve leakage or a relief-system problem. Record whether tilt and auxiliary functions are also affected. That information helps the technician choose the right flow and pressure checks instead of replacing the most expensive component first. Do not alter relief settings to compensate for a fault.
Hydraulic Pump 3EC-60-31211 is listed for selected FD35–45-7 applications, with engine/configuration details in the catalog. Match the actual engine, pump drive, rotation, mounting and ports. A model-range match alone is insufficient, especially if the truck has had an engine or pump conversion. See hydraulic parts for the identified assembly.
Delayed drive engagement: check pressure and electrical control separately
A delay selecting forward or reverse is a transmission complaint, not proof that the lift-hydraulic pump is worn. Begin with the prescribed fluid-level check and inspection of fluid condition, filters, linkage and electrical connections. Note whether only one direction is affected and whether the fault appears cold, warm or intermittently.
Transmission Charging Pump DC7335922610 is listed for FD35–50A-7/−8. It belongs to the transmission oil-supply system, distinct from the implement pump above. Replacement should follow pressure testing and assessment of other sources of internal leakage.
Transmission Solenoid Coil 3EC-15-38711 is another listed component for this family. An intermittent command may come from wiring, connectors or the coil, while a sticking valve is a separate mechanical issue. Confirm the electrical specification and fault before purchase. Do not bypass interlocks or apply an assumed voltage; a coil listing does not necessarily include the complete valve.
Build a useful parts request and maintenance record
Send a clear nameplate photograph, full model and serial, engine identification and the old part number. For axle, transmission, pump or cylinder work, add assembly markings and photographs of mounting faces and connections. Preserve the original component until the replacement has been checked. “FD50” without its suffix is not a dependable order specification.
Use the correct manual for fluids, lubrication points and service intervals, adjusted through the maintenance plan for operating conditions. Daily inspection should include leaks, tires, forks, chains, steering, brakes and warning devices. OSHA's pre-operation guidance emphasizes reporting defects and removing unsafe trucks from service. Record hours and the conditions under which a symptom appears; this makes the next diagnosis more precise.
Frequently Asked Questions
Will −7 parts fit a −8 forklift?
Some listings cover both, while others specify one generation or a serial range. Check the individual component and installed assembly; the later truck is not simply the same parts list.
Are a transmission charging pump and hydraulic lift pump the same?
No. They serve different systems. Identify which function fails and which pump the service diagnosis calls for before comparing part numbers.
Should I choose a repair kit or a complete assembly?
Base that decision on inspection. Serviceable rods, bores and housings may support a rebuild; damage to those surfaces can make seals or bearings alone an incomplete repair.
Can't find the right part? Send us a part request with your full model, serial number and photos of the component.
