Section 08
COOLING SYSTEM
Subsection 02
(CIRCUIT, COMPONENTS AND CARE)
08-02-18
SMR2002-080_08_02A.FM
THERMOSTAT
The thermostat is a single action type.
Removal
Remove the coolant pump housing from the PTO
cover. Refer to COOLANT PUMP HOUSING RE-
MOVAL elsewhere in this section.
NOTE:
The thermostat is located inside the cool-
ant pump housing.
Leak Test
Plug the connections of the oil cooler return hose,
coolant tank hose, ride plate return hose and cyl-
inder head return hose with a rag.
1. Oil cooler return connection
2. Coolant tank hose connection
3. Ride plate return hose connection
4. Cylinder head return hose connection
Fill the coolant pump housing with water.
If a bigger quantity of coolant leaks out at the ride
plate outlet connection, replace the coolant pump
housing. Refer to COOLANT PUMP HOUSING in
this section.
If there is no leak, check the operation of the ther-
mostat.
Dynamic Test
To check the operation of the thermostat, put it in
water and heat water. Look inside the cylinder
head return hose connection to see the move-
ment of the thermostat. Thermostat should open
when water temperature reaches 87°C (188°F).
If there is no operation, replace coolant pump
housing and thermostat.
Installation
For installation, reverse the removal procedure,
paying attention to the following details.
Refer to COOLANT PUMP HOUSING REPLACE-
MENT in this section.
COOLANT PUMP IMPELLER
Removal
Remove:
– coolant pump housing
no. 6
– unscrew the impeller
no. 8
clockwise.
1. Impeller
CAUTION:
Coolant/Oil pump shaft
no. 9
and
impeller
no. 8
have left-hand threads. Remove
by turning clockwise and install by turning
counterclockwise.
Inspection
Check impeller for cracks or other damage. Replace
impeller if damaged.
1
F18E12A
3
2
4
1
F18E13A
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Summary of Contents for GTX 4-TEC 5573 2002
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