Doosan G06030001, Operation & Maintenance Manual

Page: 53 / 90

53 G60, G80, G100, G150, G200-SIIIA OM Manual
MAINTENANCE / 500 HOURS (CONT’D)
CHECK COOLING SYSTEM
WARNING
Explosive release of fluid from pressurized cooling
system can cause serious burns.
Shut off engines. Only remove filler cap when cool
enough to touch with bare hands. Slowly loosen cap
to firs stop to relieve pressure before removing
completely.
Test Radiator Cap
Figure 52: Test Radiator Cap
1. Remove radiator cap and attach to D05104ST tester
as shown.
2. Pressurize cap to specification listed. Gauge should
hold pressure for 10 seconds within the normal range
if cap is acceptable.
If gauge does not hold pressure, replace radiator cap.
3. Remove the cap from gauge, turn it 180°, and retest
cap to confirm measurement.
Test Cooling System
NOTE: Engine should be warmed up to test overall
cooling system.
Figure 53: Test Radiator Cap
1. Allow engines to cool, then carefully remove radiator
cap.
2. Fill radiator with coolant to the normal operating level.
CAUTION
DO NOT apply excessive pressure to cooling system,
doing so may damage radiator and hoses.
3. Connect gauge and adapter to radiator filler neck.
Pressurize cooling system to specification listed for
radiator cap.
4. With pressure applied, check all cooling system hose
connections, radiator, and overall engine for leaks.
If leakage is detected, correct as necessary and test
system pressure again.
If no leakage is detected, but the gauge indicated a
drop in pressure, coolant may be leaking internally
within the system or at the block-to-head gasket.
Have your engine distributor or servicing dealer
correct this problem immediately.
SPECIFICATIONS
Radiator Cap
Calibration—Pressure
100 kPa (1.00 bar) (14,5 psi)
for 10 seconds minimum