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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.
To Check Valves
1) Loosen and remove screws (54 with a 10mm allen wrench.
2) Remove discharge casing (48) and valve tension springs (53).
3) Remove the discharge valves (51) by screwing supplied valve-puller into the top of the spacer pipe (51E) and firmly
sliding upward with the puller handle. NOTE: The pressure valve adapter (52) will typically come out attached to the
discharge valve. To remove, firmly grasp both pieces and rock them back and forth to break the O-ring seal on the O.D.
of the valve seat.
4) Remove the inlet valves using the same procedure as above.
5) Unscrew the valve seat (51A) from the spacer pipe (51E). Remove the valve spring (51D) and valve spring guide (51F)
and inspect for wear. Replace parts as necessary
6) Check surfaces of valve plate (51C), valve seat (51A), O-rings (51B) and replace worn parts.
7) To reinstall the inlet valves (51), screw the valve puller back into the top of the valve assembly (51). Lower the valve
into the chamber and press firmly into the bottom of the chamber to ensure the valve is seated properly. Install the
tension spring (53).
8) To reinstall the discharge valves, press the discharge valve (51) into the pressure valve adapter (52). Push the entire
assembly into the chamber. Reinstall the tension spring (53).
9) Reinstall the discharge casing (48) and tighten bolts (54) to 155 ft-lbs. in a criss-cross pattern starting with the
centermost 4 bolts and working outward.
To Change Seals
10) Loosen nuts (49A) with a 24mm socket wrench.
11) With a rubber mallet tap the back of the valve casing (50) and pull the valve casing off the stud bolt (49).
12) Remove cover plate (30) with a 10mm socket wrench.
13) By gripping hex flats, separate plunger assembly (36) from crosshead (25) by means of two open-end wrenches (size
22mm and 27mm).
CAUTION: Do not loosen the 3 plunger bases (36A) before the valve casing has been removed otherwise the
plunger assembly (36) could hit against the spacer pipe (52) when the pump is being turned.
14) Remove the intermediate casing (37) from the crankcase (1).
15) Use two screwdrivers to pry the seal case (47) out of the intermediate casing (37). Remove pressure ring (43), V sleeves
(44), sleeve support ring (45), seal tension spring (46), and O rings (47A). Inspect parts for wear and replace as neces-
sary.
16) Remove the seal sleeve (38), O ring (39), pressure ring (40), V sleeve (44), O ring (42) and drip return ring (41) from the
crankcase (1). Inspect parts for wear and replace as necessary.
17) Inspect the plunger pipe for cavitation, cracks, or any other signs of wear. If replacing plunger pipe, tighten plunger bolt
(36C) to 26 ft-lbs.
18) Reassemble all parts in reverse order taking care to lubricate all seals and O rings with silicone grease prior to installa-
tion. Reinstall plunger pipe assemblies (36) into intermediate casing (37). When installing the intermediate casing (37)
and valve casing (50) be sure that the parts rest on the studs (50A) and that they have not fallen out.
19) Reinstall valve casing (50) and tighten nuts (49A) to 103 ft-lbs.
To Change Oil Seals
20) Remove C-clip (33B) from crankcase (1) and remove seal retainer (33).
21) Remove O ring (33A) and radial shaft seal (32) and replace as necessary.
22) Reinstall seal retainer (33) and secure with C-clip (33B) in crankcase.
NOTE: Seal life can be increased if the pretensioning allows for a little leakage. This assists lubrication and keeps
the seals cool. It is therefore not necessary to replace seals before the leakage becomes too heavy and causes output and
operating pressure to drop.
To Disassemble Gear End
23) Remove entire manifold and intermediate casing assembly using procedures described above. Take out plunger
assembly (36). Drain oil.
GP7170-4000 REPAIR INSTRUCTIONS