Lifting Arms 409
Keyless Locking Devices
The HELPING-HAND™ arm utilizes keyless locking devices to retain certain pins. Proper inspection
and maintenance procedures are essential for trouble-free operation of these arms. The procedures
outlined below will cover the proper inspection, disassembly and assembly procedures.
During the daily arm inspection, pay particular attention to the pins. The pins should not move and
should be centered equally between both keyless locking devices. If any movement has been
detected, the keyless locking device should be disassembled and inspected for wear or damage.
The illustration below shows the location of the keyless locking devices on the H
ELPING-HAND™ arm.
Figure 10-46
Keyless locking devices on H ELPING -HAND™ arm
The disassembly and assembly procedures differ some depending on the part number you are
working with. Refer to the correct procedure and specifications listed in the table below.
Here are some important notes to remember for all applications:
Do not use any oil with Molybdenum Bisulphide, high pressure additives, or grease.
These substances notably reduce the coefficient of friction.
Do not use an impact wrench or power tools to loosen or tighten any of the tightening screws.
Use a torque wrench to verify tightening torque value on each screw.
Labrie P/N Bolt Torque (Qty x Size) Bore Diameter
Pin
Diameter
Page
QUB00495 13 ft-lbs (8 x M6) 2.362" - 2.364" 1.250" See page 410
QUB00498 30 ft-lbs (8 x M8) 3.150" - 3.152" 2.000" See page 412
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