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GP7155-5100 REPAIR INSTRUCTIONS
To Check Valve Assemblies
1. Loosen plugs (58), take out
tension spring (57) and then
remove the complete valve
assembly (51) with either a
valve tool or an M16 hexagon
screw.
2. Remove valve adapter (56) and
tension spring (57) with pull-out
tool size 5. There is an O-ring
(51G) under both the suction and
the discharge valve each of which
can be removed with a bent piece
of wire.To disassemble unscrew the
spring tension cap (51A) and press
the valve seat (A) out of the spacer
pipe (E). Check sealing surfaces
and replace worn parts. Check O-
rings and support rings. Reinstall
all parts in reverse order and
tighten plugs (58) to 107 ft. lbs.
To Check Seals & Plungers.
3.Loosen nuts (49A) and remove
pump head. CAUTION: Don't
loosen the 3 plunger connections
(36A) before the valve casing has
been removed otherwise the
tension screw (36C) could hit
against the spacer pipe (51E) when
the pump is being turned. 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.
4. Separate plunger connection
(36A) from crosshead (25) by
means of two open-end
wrenches (size 22 and 27). Pull
seal sleeves (39) out of their
fittings in the crankcase.
5. Take seal case (38) out of seal sleeve (39). Examine plunger
parts (36A-36D), seals (42,39A) and O-rings.
When replacing plunger pipe (36B), tighten tension screws
(36C) to 30 ft. lbs.
Replace worn parts; grease seals with silicone before installing
TO DISASSEMBLE GEAR
Take out plunger and seal sleeves as described above. Drain oil. After removing the circleclip ring (33B), lever out seal
retainer (33) with a screw driver. Check seals (32, 32A, 33A) and surfaces of crosshead. Remove crankcase cover (4).
Loosen inner hexagon screws on the connecting rods (24) and push con rod halves as far into the crosshead guide as
possible.
Note: Connecting rods are marked for identification. Do not twist con rod halves. Con rod is to be reinstalled
in the same position on shaft journals.Check surfaces of connecing rod and crankshaft (22) take out
bearing cover to one side and push out crankshaft taking particular care that the conrod doesn't gt bent.
Note: Seal (32A) must always be installed so taht the seat up on the inside diameter faces the oil.
Reassemble in reverse order: Regulate axial bearing clearance minimum 0.1mm, maximum 0.15-by
means of fitting disc (20A) shaft should yturn easily with little clearance. Tighten inner hexagon screws
to 30 ft. lbs.
Note: Connecting rod has to be able to be slighty moved sidewise at the stroke journals.
58
57
56
51E
51D
51C
51A 57
51
36B 39A
39
43
42
42
41
38