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Fault Finding
CHART A9—Engine reduced power output
Cause
Remedy
No fuel supply in the tank. Check the level in the fuel tank and replenish as required.
Oil level incorrect. Check oil level.
Engine overloaded. Check for added loading from malfunctioning accessories or
driven units, brakes dragging and other changes in vehicle loading.
Disengage the hydraulic controls.
Throttle adjustment incorrectly set or
binding.
Check the engine maximum rpm is as specified in the Technical
Specifications section. Check the throttle linkages and cable for
binding etc.
Fuel is contaminated or incorrect grade of
diesel used.
Refer to Fluids & Lubricants section for recommended diesel
fuels. If the fuel is suspect, verify by operating the engine with
clean fuel from a temporary tank.
Fuel injection lines leaking. Inspect and correct as required leaks in the high pressure lines,
fittings injector sealing washers, or delivery valves.
WARNING: Fine jets of fluid can penetrate the skip. Keep face
and hands well clear of pressurised fluid and wear protective
glasses. If fluid penetrates your skin seek medical help
immediately.
Fuel filter(s) blocked, fuel supply restricted. Check/replace the fuel filter(s). Check fuel lines for restriction.
Fuel is aerated. Check the fuel system for loose connections and possible air
ingress points. Rectify and bleed the fuel system.
Fuel lift pump not operating correctly (fuel
supply inadequate).
Check that the lift pump is operating and delivering fuel to the
injection pump.
Air intake or exhaust system is blocked. Visually check the air intake and exhaust intake for blockage or
obstruction-remove as required. Check the air filter elements for
signs of blocking-replace as required.
One or more injector worn or
malfunctioning.
Check and externally clean the injector. If the problem still
persists, the injector must be checked by a FIE specialist or replace
with new.
Worn or malfunction fuel injection pump
(FIP). Injection pump not delivering fuel.
Check for operation of the FIP.
The FIP must be taken to a local FIE specialist to have the fuel
delivery timing checked. Ensure that all obvious causes have been
eliminated before removing the FIP. (Check with local Kubota
agent)
Dirty air cleaner Replace air filter elements
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