TH62, TH63, TH82 and TH83 Telehandlers Caterpillar

It may be necessary to purge air from the boom extend cylinder after the hydraulic oil has been changed. It may also be necessary to purge air from the boom extend cylinder after any disassembly of hydraulic system components.

Normally, the hydraulic system will purge air from the boom extend cylinder but air can be trapped. Air in boom extend cylinder can cause erratic boom motion.

1. If necessary, warm the hydraulic oil by raising the boom and lowering the boom.
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   Illustration 1	g00710060

2. Retract and lower the boom. Position the machine on a down slope. Engage the parking brake.

3. Fully extend the boom and retract the boom six times. This will purge air from the cylinders.

4. Move the machine back to level ground and check the operation of the boom motion.