Filter
Top Products
GP7128 Repair Instructions
NOTE: Always take time to lubricate all metal and non-metal parts with a light film of oil
before reassembling. This step will help ensure proper fit, at the same time protecting
the pump non-metal parts (elastomers) from cutting and scoring.
1. Lossen screws (58C), take
plugs (58) out of valve cas-
ing with two screws.
2. Take out complete valve
assemblies (51 and 52) us-
ing either tool (part
#07662) or stud bolt.
3. Valve seats (51C and 52C)
are pressed out of spacer
pipe (51F) by hitting the
valve plate (51D) with a
bolt.
4. Check surfaces of valve plate, valve seat, O-rings (51B, 58A) and
replace worn parts.
5. When reassembling: The
suction valve seat (51C) is
1mm smaller in diameter
than the discharge valve
seat (52C). Suction valve
seats are marked "S" and
always have to be installed
first. Discharge valve seats
are marked "P" and are al-
ways tobe installed on top
of suction valve. Plugs (58)
are to be tensioned down
evenly with screws (58C)
and crosswise at 156 ft-lbs.
(210 NM).
51F 51E 51C 51B 51A 51C or 52C
or 52C
P
S
6. Loosen nuts (49A) 7. Remove pump head.
6