Cooling System (cont’d)
4 Attach a radiator tester and increase the pressure to
0.9 kg / cm
2
(12.8 psi).(fig. C172) Inspect the radiator,
hoses and engine block for external leaks. Repair as
required.
5 Attach a radiator tester to the radiator cap. (fig.
C173) Apply 0.9 kg / cm
2
(12.8 psi ) pressure to the radia-
tor cap. The pressure should not drop more than 0.3kg /
cm
2
(4.3 psi) in 10 seconds. Replace the radiator cap if
required.
If no external leaks are found, and the radiator cap tests
good, there may be an internal problem with the engine
such as a gasket, cylinder head or block defect. Consult a
Kubota Repair Manual P / N 40916 (Kubota P / N 97897-
0109-5) to assist in engine disassembly and inspection.
Coolant Replacement:
The engine coolant should be changed every 1000 hours
of operation. To change the coolant:
Park the loader on a level surface, lower the boom arms,
engage the parking brake and shut off the engine.
1 Make sure the engine is not hot to touch. Remove the
radiator cap.
2 Remove the radiator drain plug located lower left
corner of radiator. (fig. C3626) Be prepared to contain 7
liters (1.8 gal) of fluid.
3 Open the engine drain petcock located next to the
engine fuel pump, just below the engine solenoid shut off.
Close the drain petcock after the engine is completely
drained.
Note:Attaching a piece of 5 / 16” (8mm) hose to the
drain petcock and routing to a container lessens waste
fluid clean up. Please dispose of waste fluid in an envi-
ronmentally friendly manner.
4 Replace the radiator drain plug using teflon tape or
equivalent on the threads. Be sure to tighten the drain
plug so it does not protrude past the radiators lower
mount. This will prevent interference with the hydraulic
oil cooler.
5 Pre - mix the engine coolant, ethylene glycol, to
equal parts of water. (50 / 50 ratio) Add the mixed coolant
to the engine radiator.The cooling system will hold
approximately 7 liters (1.8 gal) of coolant. Never use
coolant undiluted. Pure coolant does not absorb and pass
heat efficiently. It will also gel in cold weather.
7-9
C172
C3626
C173
Radiator drain
Radiator cap test
Pressurizing the
cooling system
ENGINE MAINTENANCE 7.1
WARNING
Do not remove the radiator cap when the engine is
hot.
To Next Page
Loading...
