Installation Of Check Balls And Plugs In Quill - Komatsu 930E-2 Shop Manual

Installation Of Check Balls And Plugs In Quill

The check balls (4, Figure 8-22) in the side of the quill
assembly (2) are held in place with threaded plugs (3).
If a plug is missing and the check ball is not found in
the cylinder, the opposite side hoist cylinder and the
plumbing leading to the hoist valve should be exam-
ined for damage. The hoist valve itself should also be
checked to see if the ball or plug has caused internal
damage to the spool. Peening of the necked down
sections of the spool may result. Spool sticking may
also occur under these circumstances.
Refer to Figure 8-23 for SS1158 tool that can be made
for installing or removing the check ball plugs.
Plugs should be checked during any cylinder repair to
be sure they are tight. If found to have any movement,
they should be removed and the ball seat in the quill
checked to see if it is deformed.
• If deformation of the ball seat has occurred, the
quill should be replaced.
• If the ball seat area is not deformed, measure the
plug thickness as shown in Figure 8-21:
Older Plug is 0.25 ±0.02 in. thick.
Newer plug is 0.38 ±0.02 in. thick.
L8-18
1. Use the newer plugs and make certain threads in
2. Use Loctite "LOCQUIC
3. Apply Loctite Sealant #277 (VJ6863, or equiva-
4. Place check balls (4) in quill tube (2) and install
* Note: If "LOCQUIC
used, the cure time will require 24 hours instead of 2
hours.
5. Stake plug threads in two places (between holes)
If removal of the plug is necessary in a later rebuild, it
will be necessary to carefully drill out the stake marks
and destroy the plug. A new plug should be installed
and staked as previously detailed.
FIGURE 8-23. SS1158 TOOL
PLUG INSTALLATION/REMOVAL
Hoist Circuit Component Repair
quill tube and on plugs are clean and dry (free of
oil and solvent).
®
" Primer "T" (TL8753, or
equivalent), and spray mating threads of both
plugs (3, Figure 8-22) and quill assembly (2).
Allow primer to dry 3 to 5 minutes.
lent) to mating threads of both plugs and quill
assembly.
plugs (3) with concave side facing ball. Using
SS1158 tool, tighten plugs to 70 ft.lbs. (95 N.m)
torque. Allow parts to cure for 2* hours before
exposing threaded areas to oil.
®
" primer "T" (TL8753) was not
as shown in Figure 8-22 to prevent loosening of
plug.
L08024