Engine Rpm Surges - NC HT1.0 Original Instructions Manual

CHART A11—Engine rpm surges
Cause
Fuel level low.
If the condition occurs at idle, the idle speed
is set too low for the accessories.
Throttle adjustment incorrectly set or
binding.
Fuel injection lines leaking.
Fuel tank cap vent/breather blocked.
Fuel is aerated.
One or more injector worn or
malfunctioning.
Worn or malfunction fuel injection pump
(FIP). Injection pump not delivering fuel.
Fault Finding
Check/fill fuel tank.
Check the engine idle rpm setting.
Check the engine maximum rpm is as specified in the Technical
Specifications section. Check the throttle linkages and cable for
binding etc.
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.
Inspect & rectify as required. Replace cap if necessary.
Check the fuel system for loose connections and possible air
ingress points. Rectify and bleed the fuel system.
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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