New Holland CX720 Repair Manual page 1804

Problem
Water temperature gauge
fails to reach normal
operating temperature
Low oil pressure
Excessive oil
consumption
Engine tends to keep
firing after fuel is shut off
ENGINE - Troubleshooting (B.10.A - G.40.A.10)
CX720, CX740, CX760, CX780, CX820, CX840
IMPORTANT: Whenever effecting a repair, the cause of the problem must be identified and corrected to avoid repeat
failures. The following table lists problems and their possible causes with recommended remedial action.
Problem
Engine overheats
POWER PRODUCTION - ENGINE
Possible Cause
Extended engine idling
Oil cooler tube blocked
Radiator core tubes blocked
Faulty temperature sender
Incorrect or faulty thermostat
Faulty water temperature gauge
Engine oil level low
Wrong grade of oil
Blocked oil pump sump screen
Oil pressure relief valve faulty
Oil pump worn
Excessive oil pump rotor and shaft assem-
bly clearance
Excessive main or connecting rod bearing
clearance
Engine oil level too high
External oil leaks
Worn valves, valve guides or bores
Cylinder head gasket leaking
Oil loss past the pistons and rings
Oil cooler leak
Air cleaner dirty or restricted
Oil leak on compressor side of tur-
bocharger where fitted
Possible Cause
Hose connection leaking or collapsed
Radiator cap defective or not sealing
Radiator leakage
Improper fan belt adjustment
Radiator fins restricted
Faulty thermostat
Internal engine leakage
Water pump faulty
Exhaust gas leakage into cooling system
Coolant aeration
Cylinder head gasket improperly installed Replace cylinder head gasket
Hot spot due to rust and scale or clogged
water jackets
B.10.A / 258
Do not allow engine to idle for long periods
Clean
Check free flow
Renew sender switch
Renew thermostat
Renew temperature gauge
Top up, as necessary
Drain and refill with correct grade of oil
Clean pump screen
Fit new relief valve
Renew oil pump
Overhaul pump
Install new bearings inserts and / or regrind
crankshaft if necessary
Reduce oil level
Renew gaskets and seals, where neces-
sary. Check mating surfaces for damage
or distortion
Renew
Renew gasket. Check head for damage or
distortion
Renew rings and/or re-bore/ re-sleeve
block as necessary
Repair/renew oil cooler assembly
Clean or renew element
Overhaul turbocharger
Tighten hose connection, replace hose if
damaged
Replace radiator cap
Repair/replace radiator
Readjust fan belt
Clean with compressed air
Replace thermostat
Check for source of leakage, replace gas-
ket or defective parts
Overhaul water pump
Replace cylinder head gasket, check head
for damage or distortion
Tighten all connections and check coolant
level is correct. Ensure cylinder head gas-
ket has not blown
Reverse flush entire cooling system
2 4/7/2006
Correction
Correction