412 Lifting Arms
Figure 10-50
Tightening screws in a continuous sequence
Keyless Locking Devices - QUB00498
These locking devices are used on HELPING-HAND™ lift arm pivot pin.
Procedure for disassembly
1. Loosen locking screws gradually in a cross sequence, shown in Figure 10-47.
2. Remove all locking screws and ensure there is no damage to push-off threads of the front collar.
3. Transfer required number of screws into all push-off threads in the front collar (see Figure
10-51).
Figure 10-51
Transferring screws into push-off threads (3)
4. Release front collar by progressively tightening all push-off screws.
Typically, the push-off screws appear to be completely tight after just one pass of tightening
without any noticeable separation of clamp collars. Although it seems that the screws cannot be
tightened further, several more rounds of torqueing in a cross sequence will increase the push-off
force in the system and ultimately release the front collar.
5. To release the rear collar, continue tightening the screws in the front collar.
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