Assembly Of Quill And Cylinder - Komatsu 930E-2 Shop Manual

ASSEMBLY OF QUILL AND CYLINDER

NOTE: Use only new seals, bearings and O-rings
during reassembly. Thoroughly lubricate all parts and
seals with hydraulic oil to aid in assembly and to
provide lubrication during initial operation.
Quill Installation
1. The plugs (3, Figure 8-22) and the check balls (4)
in the quill should be checked during any cylinder
repair to insure the plugs are tight and ball seats
are not damaged. Refer to "Installation of Check
Balls and Plugs in Quill".
2. Secure cap assembly (1) in a sturdy fixture. Make
certain threads in cap and threads on quill are
clean and dry (free of oil and solvent).
3. Using Loctite "LOCQUIC
part number TL8753, or equivalent), spray mat-
ing threads of both cap assembly (1) and quill
assembly (2).
Allow primer to dry 3 to 5 minutes.
4. Apply Loctite Sealant #277 (Komatsu part num-
ber VJ6863, or equivalent) to mating threads of
both cap assembly and quill assembly.
5. Install quill and use SS1143 tool to tighten quill
to 1000 ft. lbs. (1356 N.m) torque. Allow parts to
cure for 2* hours before exposing threaded areas
to oil.
®
* Note: If "LOCQUIC " primer "T" (TL8753) was not
used, the cure time will require 24 hours instead of 2
hours.
6. Tack weld quill in 2 places as shown in Figure
8-22.
7. Remove all slag and foreign material from tack
weld area before assembly of cylinder.
During future cylinder rebuilds, removal of the quill will
not be necessary, unless it has loosened or is dam-
aged. Removal, if necessary, will require a break-loose
force of at least 2000 ft. lbs. (2712 N.m) torque after
the tack welds are ground off.
L08024
®
" Primer "T" (Komatsu
Hoist Circuit Component Repair
FIGURE 8-22. PLUG and CHECK BALL
INSTALLATION
1. Cap Assembly
2. Quill Assembly
3. Plug
4. Check Ball
L8-17