Lifting Arms 413
6. Repeat step 4 until the rear collar releases.
Procedure for Inspection
1. Inspect pin and bore surfaces for damage or galling.
2. Measure outside diameter of pin and inside diameter of bore and compare measurements to the
table on page 409. Replace any worn or damaged parts.
3. If keyless locking device is to be re-used, thoroughly clean all the surfaces and lubricate both
screws and treads with a thin film of light-weight oil.
Procedure for Assembly
1. Carefully clean the bore and shaft contact surfaces and apply a thin film of light-weight oil.
2. Ensure that all slits are aligned and that the front and rear collars are disengaged from the center
collar before inserting into the bore and onto the shaft.
3. Verify the shaft is centered equally between both keyless locking devices.
4. Tighten all locking screws gradually in a cross pattern (see Figure 10-47).
5. During the first round of tightening all locking screws, apply up to 50% of the tightening torque
listed in the table above.
6. Repeat steps 4 and 5; however, this time apply 100% of the tightening torque listed in the table
on page 409.
7. Apply 100% of the tightening torque in a continuous sequence (see Figure 10-50).
Perform this step twice.
Slide Wear Pad Lubrication
The wear pads on the HELPING-HAND™ arm are made of UHMW (Ultra High Molecular Weight)
material, designed to operate in severe environments with superior performance at a low noise level.
Figure 10-52
Wear pads
This UHMW plastic is a wear item of the arm and requires routine planned maintenance and
replacement. It should be thoroughly cleaned, inspected and lubricated weekly. Since UHMW is a
petroleum-based product, it is intended to operate dry or with non-petroleum-based lubricant.
Petroleum-based lubricants will be absorbed by the wear pads, causing swelling and potential
binding.
Slide wear pads
Outer slide wear
pads (Long Reach
version only)
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