POWER TRAIN RT770E
7-20
Published 11/26/2014, Control # 447-05
Refer to Engine Drive Belts, page 7-3.
Thermostat
The thermostat is of the nonadjustable type and is
incorporated in the cooling system for the purpose of
retarding or restricting the circulation of coolant during
engine warm up. Engine overheating and loss of coolant is
sometimes due to an inoperative thermostat. To check for
this condition, remove the thermostat and test by
submerging it in hot water and noting the temperature at
which the thermostat opens and closes. Use an accurate
high temperature thermometer for making this test.
Hoses and Clamps
Hoses and their connections must be checked regularly
because they are often the source of hidden trouble. Hoses
may often times appear in good condition on the outside
while the inside will be partially deteriorated. If there are any
doubts about a hose doing its job, replacement should be
made. The clamps should be inspected to make sure they
are strong enough to hold a tight connection.
Radiator Removal and Installation
Removal
1. Set the outriggers and position the boom to over the
side.
2. Open the drain cock at the bottom of the radiator and
drain the coolant into a suitable container. Dispose of the
coolant in accordance with local and EPA regulations.
NOTE: Remove the radiator cap when draining the system
to ensure proper draining.
3. Open and remove the hood top door assembly.
4. Disconnect the air filter tubing at the engine and air
cleaner. Remove and lay aside.
5. Tag and disconnect the hourmeter wiring.
6. Remove the capscrews, nuts and washers holding the
rear engine hood panel to the engine hood. This will gain
access to the rear of the radiator and the surge tank
mounting hardware.
7. Tag and disconnect the hoses from the surge tank to the
engine and from the surge tank to the radiator.
8. Remove the capscrews, washers, flatwashers and nuts
holding the surge tank to the side of the engine hood.
9. Remove the bolts and washers holding the transmission
filter to the to the mounting bracket on the left side of the
engine hood.
10. Remove the engine hood assembly.
11. Remove the nuts, washers and muffler clamps securing
the two charge air cooler tubes to the left and right sides
of the fan shroud.
12. Remove the hose clamps and bellows connecting the
radiator to the charge air cooler tubes.
13. Remove the nuts, washers and muffler clamp securing
the radiator return tube.
14. Remove the hose clamps and radiator hose connecting
the radiator to the radiator tubes.
15. Disconnect the coolant level harness from the engine
harness.
16. Remove the bolts and washers attaching the fan guard
to the shroud ring. Remove the fan guard.
17. Remove the capscrews, washers and four spacer plates
securing the shroud ring to the radiator and slide the
shroud ring back onto the engine fan.
18. Remove the capscrews, washers and lockwashers that
connect the plates to the top of the radiator and the top
of the frame rail.
NOTE: The radiator weighs approximately 34 kg (75 lb).
19. Attach an adequate lifting device to the radiator
assembly.
20. Remove the capscrews, washers, lockwashers, nuts
and mounting angles securing the radiator flange to the
frame mounting capscrews. Remove the radiator
assembly from the carrier.
21. If a new radiator is to be installed, remove all fittings and
hoses from the old one and install them in the same
locations on the new one.
Installation
1. Ensure all fittings and hoses are installed on the radiator.
2. Position the radiator assembly in the carrier using a
lifting device. Take caution not to tear or misplace the
rubber molding around the radiator assembly. Secure
the radiator flange to the frame mounting brackets using
capscrews, washers, lockwashers, nuts and mounting
angles.
3. Reconnect the two plates between the top of the radiator
and the top of the frame rail using the capscrews,
washers, lockwashers and nuts.
4. Connect the shroud ring to the radiator using the
capscrews, washers, lockwashers and four spacers
taken off during removal.
5. Position the fan guard on the shroud ring and secure
with bolts and washers.
6. Reconnect the coolant level harness to the engine
harness.
7. Connect the two radiator tubes to the radiator with hose
clamps and the radiator hose.
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