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Fault Finding
CHART A10—Engine will not reach maximum rpm
Cause
Remedy
Tachometer faulty (if fitted). Verify the engine speed with a hand held tachometer. Measure on
the fan drive pulley and this will be the engine rpm.
Engine overloaded. Verify high idle speed without load. Investigate operation to ensure
correct gear is being used.
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 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.
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 filter(s) blocked, fuel supply restricted. Check/replace the fuel filter(s). Check fuel lines for restriction.
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)
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