Engine Will Not Reach Maximum Rpm - NC HT1.0 Original Instructions Manual

CHART A10—Engine will not reach maximum rpm
Cause
Tachometer faulty (if fitted).
Engine overloaded.
Throttle adjustment incorrectly set or
binding.
Fuel is aerated.
Fuel lift pump not operating correctly (fuel
supply inadequate).
Fuel is contaminated or incorrect grade of
diesel used.
Fuel filter(s) blocked, fuel supply restricted.
One or more injector worn or
malfunctioning.
Worn or malfunction fuel injection pump
(FIP). Injection pump not delivering fuel.
Fault Finding
Verify the engine speed with a hand held tachometer. Measure on
the fan drive pulley and this will be the engine rpm.
Verify high idle speed without load. Investigate operation to ensure
correct gear is being used.
Check the engine maximum rpm is as specified in the Technical
Specifications section. Check the throttle linkages and cable for
binding etc.
Check the fuel system for loose connections and possible air
ingress points. Rectify and bleed the fuel system.
Check that the lift pump is operating and delivering fuel to the
injection pump.
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.
Check/replace the fuel filter(s). Check fuel lines for restriction.
Check and externally clean the injector. If the problem still
persists, the injector must be checked by a FIE specialist or replace
with new.
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)
Remedy
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