DRESSTA TD-25M EXTRA - Service Diagnosis

COOLING SYSTEM SECTION 6
Page 5
DRESSTA TD-25M EXTRA
4. SERVICE DIAGNOSIS
Intake Air Cooling System
COMPLAINT
PROBABLE CAUSE REMARKS
Engine Power Output Low
1.Air leak between the turbocharger and
intake manifold.
Check the CAC system piping connections for leakage.
Replace damaged parts.
2. CAC restricted.
Inspect the air cooler for external and internal
restrictions / clogging.
3. Damaged fan blades. Replace fan.
4. Fan drive hydraulic system problem Refer to Section 10.
5. Engine overloaded.
Review operating instructions in the Operator's
Manual.
Engine cooling system
COMPLAINT
PROBABLE CAUSE REMARKS
Overheating Due to Restricted Air Flow
1. Clogged radiator. Flush with steam for external clogging.
2. Damaged fan blades. Replace fan.
3. Fan drive hydraulic system problem. Refer to Section 10.
4. Engine overloaded.
Review operating instructions in the Operator's
Manual.
Overheating Due to Poor Circulation
1. Low coolant level. Fill cooling system to proper level.
2. Tank cap not securely tightened
to seal the pressure system.
Remove radiator cap and inspect. Replace cap if
gasket is worn. Tighten radiator cap to maintain
pressure in system.
3. Pressure relief valve on tank cap
is faulty. Coolant pressure escaping.
Replace cap. Do not repair or replace any relief valve
parts.
4. Faulty thermostat(s).
Check thermostat(s) for operation. Replace if faulty.
Refer to Troubleshooting and Repair Manual QSX15
Engines.
5. Restriction in radiator core.
Make a cooling system pressure test.
Flush the cooling system chemically.
Refer to Troubleshooting and Repair Manual
QSX15 Engines.
6. Coolant pump problem
Make a cooling system pressure test. Remove coolant
pump and recondition. Refer to Troubleshooting
and Repair Manual QSX15 Engines.
Internal Leakage
1. Warped cylinder head.
Replace cylinder head and gasket. Torque head bolts
as specified in the Troubleshooting and Repair Manual
QSX15 Engines.
2. Engine oil cooler cracked.
Remove oil cooler, perform pressure test. Refer to
Troubleshooting and Repair Manual QSX15 Engines.