JLG G12-55A AccuPlace Service Manual - Manual (Page 40)

Boom
3.18 G10-55A & G12-55A AccuPlace
3.8 QUICK SWITCH ASSEMBLY
3.8.1 Quick Switch Removal
1. Remove the lock bolt holding the tilt cylinder rod end
pin to the quick switch assembly. Remove the Tilt
Cylinder pin.
2. Support the quick switch assembly.Remove the
capscrew and locknut securing the head pin to the
boom head.
3. Inspect the above pins for nicks or surface corrosion.
Use fine emery cloth to fix minor nicks or corrosion.
If damaged or if it cannot be repaired, the pin must
be replaced.
3.8.2 Quick Switch Installation
1. Assemble the quick switch to the boom head. Line
up the quick switch between the mounts on the
boom head. The quick switch should be centered in
the boom head.
2. Coat the quick switch head pin with an anti-seize
compound. Insert the quick switch head pin through
the quick switch and boom head. Secure with the
previous capscrew and locknut.
Align the quick switch with the tilt cylinder rod end and
insert the tilt cylinder pin. Align the tilt cylinder pin and
screw in the locking bolt. Torque as required.
3.9 FORKS
Forks should be cleaned and inspected prior to being
attached to carriage. If the following criteria is not met,
forks must be removed from service immediately.
Daily Inspection
1. Inspect forks (6) for cracks, paying special attention
to heel (7) and mounting tubes (8).
2. Inspect forks for broken or bent tips (9) and twisted
blades (10) and shanks (11).
Yearly Inspection
1. Straightness of the upper face of blade (10) and the
front face of shank (11) should not exceed 0.5
percent of the length of blade or height of shank.
2. Angle (12) between upper face of blade and front
face of shank should not exceed 93 degrees.
3. Thickness of blade (15) and shank (16) should not
be reduced to 90 percent of original thickness.
4. Ensure fork length (14) is adequate for intended
loads.
5. Fork markings should be legible, re-stamp if
required.
6. Compare fork tips (13) when mounted on a carriage.
Maximum difference in height of fork tips is 3 percent
of the length of the blade (15).
MH6460
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