JLG TF6-42 Service Manual - Manuale (Pagina 663)

T12000 ID 04/99 4-4
Maintenance
4.3 SERVICING MACHINE AFTER COMPONENTS OVERHAUL
The transmission, torque converter, and its allied hydraulic system are important links in the driveline between
the engine and the wheels. The proper operation of either unit depends greatly on the condition and operation
of the other. Therefore, whenever repair or overhaul of one unit is performed, the balance of the system must
be considered before the job can be considered complete.
After the overhauled or repaired transmission has been installed in the machine, the oil cooler, and connecting
hydraulic system must be thoroughly cleaned. This can be accomplished in several manners and a degree of
judgement must be exercised as to the method employed.
The following are considered the minimum steps to be taken:
1. Drain entire system thoroughly.
2. Disconnect and clean all hydraulic lines. Where feasible hydraulic lines should be removed from machine
for cleaning.
3. Replace oil filter element.
4. The oil cooler must be thoroughly cleaned. The cooler should be “back flushed” with oil and compressed
air until all foreign material has been removed. Flushing in direction of normal oil flow will not adequately
clean the cooler. If necessary, cooler assembly should be removed from machine for cleaning, using oil,
compressed air, and steam cleaner for that purpose.
IMPORTANT
DO NOT USE FLUSHING COMPOUNDS FOR CLEANING PURPOSES .
5. Reassemble all components and use only type oil (See chapter 4.1.1 “Recommended lubricants”).
Fill the transmission through filler opening until fluid comes up to FULL mark on transmission dipstick.
Note
I F THE DIPSTICK IS NOT ACCESSIBLE OIL LEVEL CHECK PLUGS ARE PROVIDED .
• Remove check plug, fill until oil runs from oil hole. Relift filler and level plug.
• Run engine two minutes at 500 - 600 RPM to prime torque convertor and hydraulic lines.
• Recheck level of fluid in transmission with engine running at idle (500 - 600 RPM).
• Add quantity necessary to bring fluid level to FULL mark on dipstick or runs from oil
• level check plug hole.
• Install oil level plug of dipstick.
• Recheck with hot oil 82.2 - 93.3
°C (180 - 200 F).
• Adjust oil level to FULL mark on dipstick or runs freely from oil level plug.
6. Recheck all drain plugs, lines, connections, etc.…, for leaks and tighten where necessary.