Graco REGULUS 003.175-DP User Information page 21

If pin is to be removed, first pull out safety rings
After replacement of wearing parts reassemble in reverse order
You will require the gripper (Article No. 70630 002002) to insert the safety rings
(special tools, see tool list).
To avoid damage to the O-ring, always assemble the pin
bushes open from the outside.
with flat-nosed pliers.
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first, then slide the
Fig. 16
B.6.50.80-B-GB