Johnston VM502, Maintenance Manual

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V Range 502
l
652
l
802 Maintenance Manual
MA7:6
Chapter - Remove and Refit Procedures
Removal
To remove the radiator it will first be necessary to remove the hydraulic oil cooler.
1. Drain the hydraulic oil to a level below that of the cooler using the remote drain under the
systems locker.
2. Disconnect the hydraulic oil pipes from the cooler.
3. Remove the cover plate.
4. Remove the four screws retaining the oil cooler to the cooling pack case.
5. Remove the oil cooler.
6. Remove the cap from the expansion tank and drain the radiator coolant from the remote drain
behind the systems locker.
7. Disconnect the water hoses from the radiator.
8. Remove the four screws retaining the radiator to the cooling pack case, and remove radiator.
Refitting
1. Attach the radiator to the cooling pack case with four screws.
2. Reconnect the radiator hoses.
3. Fill the cooling system via the expansion tank, first ensuring the remote coolant drain is closed.
When full, replace the expansion tank cap.
4. Refit the oil cooler using the four screws, and refit the cover plate.
5. Ensure the remote hydraulic oil drain is closed and refill the hydraulic oil tank.
6. Run the engine to circulate the hydraulic oil through the system. Turn off the engine and top up
the hydraulic oil to the correct level.
7. Check also the coolant level and top up if necessary.
4 Fan Impeller
-
(see also Chapter 6)
Removal
1. Unscrew the fan inlet duct from the fan case to expose the fan impeller.
2. Prior to removing the fan impeller, check for excessive axial movement in a similar manner to
checking an automotive wheel bearing. Any excessive play would indicate wear in the bearings/
gearbox assembly requiring an overhaul.
3. Unscrew the three screws securing the fan to the gearbox shaft.
4. Withdraw the impeller from the splined shaft and fan case. A puller (part no. 437-2) is available if
required. Note – the fan impeller is heavy (circa 40-50kg) and suitable lifting/handling equipment
should be employed.
5 Fan Case -
(see also Chapter 6)
Removal
1. Carry out procedure 4.
2. Remove the engine exhaust silencer and tailpipe from the fan case.
3. Unscrew the four screws retaining the fan case mask to the transfer gearbox and remove.
4. Unscrew the four screws securing the fan case to the front and rear valances (two either side).
5. The fan case can now be removed. If the fuel tank prevents the fan case removal, loosen the
four tank screws on its underside and slide the tank outwards.
VT - Twin Engine
3 Radiator
WARNING:
Insure the cooling system has adequately cooled before commencing