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ATTENTION
REPLACING THE SEALS
1. INSTALLING THE U-CUP SEALS
a. One method of folding u-cup seals (PP) is illustrated below. Insert flat side into
groove.
HOW TO HOLD THE U-CUP SEAL
b. Installation should be performed quickly, taking care to observe the correct
direction. Taking too much time might let the u-cup take a set, which could
cause leaks.
c. Care should be exercised as not to damage the lip
when installing the u-cup seal. Installation of damaged
u-cup seals will cause oil leaks.
d. After installing u-cups in the sleeve, coat them with
grease to assist with piston installation.
e. GH06 – GH3 only – install seal (PP) from gas end (2)
of hammer body.
2. INSTALL THE O-RINGS AND BACK UP RINGS
a. Install the o-rings.
b. Curl the back up rings, as shown below, and install.
c. After installing, coat the o-rings and back up rings with grease.
Inspect sleeves to verify that the o-rings, back up
rings, and u-cup seals are correctly arranged.
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