52
Fault Finding
CHART A2—Dumper will not start or difficult to start (exhaust
smoke)
Cause
Remedy
Cold starting aid not working (if fitted). Check for the correct operation of the cold start advance.
Intake air insufficient. 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.
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.
Fuel drain return line blocked or not
connected properly.
Verify that the fuel return line is not obstructed and connected to
the top of the fuel tank.
Check the fuel inlet restriction. Maximum inlet restriction to the fuel transfer pump must not
exceed 100mm Hg (4” Hg).
Injection pump timing incorrect. If the pump has recently been removed and replaced the timing
could be incorrect if the correct removal procedures were not
followed.
The timing can only be checked by a FIE specialist using the
correct equipment.
Inlet and exhaust valve clearances set
incorrectly.
Set the valve clearances to the recommended clearances.
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.
Engine compression low in one or more
cylinders.
Check the engine compression.
Cranking speed too slow. Refer to Chart A3 for possible low cranking speed faults.
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. (Needs to be, Delphi DP210
capable agent for mechanical engines and for common rail
electronic engines see Delphi agent or JCB dealer
(www.delphi.com or www.jcb.com)
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