Allmand Brothers Allmand 7.5 FT BACKHOE - Manual (Page 17)

17
REPLACING DAMAGED BACKUP RINGS
Backup rings are installed at the factory using a special
sizing tool.
1. Do not replace backup rings offered in seal kits
unless original ring has been damaged.
2. If backup ring must be replaced, cut replacement
backup ring as shown.
CAUTION: Make only one diagonal cut in backup
ring. Do not cut backup ring into two pieces.
3. Slip backup ring over cartridge and into place.
INSTALLING “SC” SPOOL POSITIONER KIT (Item
2 Figure 6)
1. Remove socket head cap screws and bonnet from
section.
2. Remove spool from section. Follow instructions in
“Spool Seal Removal” section except do not
remove seals.
3. Replace parts in “SC” spool positioner kit.
NOTE: Spool screw on end of spool is loctited in
place. Do not replace unless it is damaged. If spool
screw must be replaced, refer to “Replacing Spool
Ends” Section.
4. Replace spool in section. Refer to instructions in
“Spool Seal Installation” section.
5. Replace bonnet and socket head cap screws.
REPLACING SPOOL ENDS
1. Spool extensions (handle end) are installed at the
factory using Loctite 262. Spool screws (positioner
end) are installed at the factory using Loctite 242.
Do not replace them unless they are damaged. Use
following procedure to replace them.
2. Remove spool from section. Follow instructions in
“Spool Seal Removal Section” except do not remove
seals.
3. Clamp spool using vice grips on land section of
spool not machined for valve bore.
4. Unscrew damaged end.
NOTE: Heat may be applied to loosen Loctite.
5. Clean threads with Loctite Primer and install using
Loctite 262 for handle ends and Loctite 242 for
positioner ends.
Replace spool in section. Refer to instructions in “Spool
Seal Installation” section.
VALVE SERVICE