New Holland CR9090 Tier 4a, Service Manual

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Engine - Engine and crankcase
Engine - Troubleshooting
CR Series Tier IV NA
CX8000 Elevation series NA
NOTICE: When effecting a repair the cause of the problem must be investigated and corrected to avoid repeat failures.
NOTE: Preliminary conditions
Electric troubleshooting must be performed with specific instruments.
The air system must be efficient.
The engine must have the proper oil pressure.
If the engine works but has occasional or non-constant trouble, check the earth connections.
Problem Possible Cause Correction
The engine fails to start Partially run down batteries. Check, recharge the batteries and change
them if necessary.
Connections to battery terminals corroded
or loose. Clean, examine, tighten the nuts and, if
necessary, change any excessively worn
terminals and nuts.
Incorrect timing of injection pump on en-
gine. Correctly time the injection pump on the en-
gine.
Collection of impurity or water in the fuel
lines. Disconnect the lines, injection pump and
clean them carefully and, if necessary,
clean and dry the fuel tank.
Fuel tank without fuel. Fill.
No supply from injection pump. Check and, if necessary, change the supply
pump.
Air in the fuel circuit. Check the lines, fittings, fuel pump, filters
and injection pump for the presence of air;
lastly, bleed the circuit.
Starter motor damaged. Repair or change the starter motor.
Engine stops Idle rpm too low. Adjust the idle speed.
Irregular flow of injection pump. Check the flow rates on a test bench.
Collection of impurity or water in the fuel
lines. Disconnect the lines, injection pump and
clean them carefully and, if necessary,
clean and dry the fuel tank.
Fuel filters clogged. Change the filter cartridges.
Abnormal clearance between valves and
rockers. Adjust the clearance between valves and
rockers.
Burnt or cracked valves. Change the valves.
Air in the fuel circuit. Check the lines, fittings, fuel pump, filters
and injection pump for the presence of air;
lastly bleed the circuit.
Injection pump controls damaged.
Change the damaged parts.
Engine does not develop
full power Clogged air cleaner Clean or renew element
Fuel line obstructed Clean
Faulty injectors Clean and reset
Incorrect valve clearance adjustment
Check and reset
Burnt, worn or sticking valves Replace valves with new or oversize,
and/or machine the valve guide bores
Blown head gasket Check head flatness and fit new gasket
Incorrect fuel delivery Check injectors and pump
Low cylinder compression
Renew piston rings or re-bore/re-sleeve as
necessary
Oil pressure warning light
fails to operate
Bulb burnt out Renew bulb
Warning Light pressure switch faulty Renew pressure switch
Warning light circuit faulty Check and renew wiring
Abnormal engine smoke:
black or dark grey smoke Maximum injection pump flow rate too high. Adjust the injection pump on the bench fol-
lowing the calibration table.
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