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CAUTION: Don't loosen the 3 plunger (36) before the valve casing has been removed otherwise the plunger
(36) could hit against the spacer pipe (51F) 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.
MOUNTING VALVE CASING
NOTE: Replace worn parts; grease seals with silicone before installing.
12. Check O-rings (38A) and support rings (38B) on seal case (38). Clean surfaces of seal sleeves in
gear box and sealing surfaces of valve casing. Reassemble seal sleeve (39) by placing plunger (36)
in seal sleeve; place pressure ring (41), v-sleeves (42), sleeve support ring (43), and tension spring
(45) over plunger (36). Place the seal case onto the seal sleeve and press into the crankcase, making
sure that the weep hole on the seal sleeve is facing down. Tighten tensioning screw (36C) for
plunger onto crosshead (25) with an open end wrench to 33 ft-lbs. (45NM)
13. Push valve casing carefully onto O-rings of seal case and centering studs (50A). Tighten nuts (49A)
to103 ft-lbs. (140NM).
TO DISASSEMBLE GEAR
14. Take out plunger (36) and seal sleeves (39) as described above. Drain oil.
15. After removing the circlip ring (33B), lever out seal retainer (33) with a screw driver. Check seals
(32,32A,33A) and surfaces of crosshead.
16. 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.
CAUTION: 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.
17. Check surfaces of connecting rod and crankshaft (22). Take out bearing cover (14) to one side and
push out crankshaft taking particular care that the connecting rod (24) doesn't bend.
CAUTION: Seal (32A) must always be installed so that the seal-lip on the inside diameter faces the
oil. Reassemble in reverse order: Regulate axial bearing clearance - minimum
0.1mm, maximum 0.15mm-by means of fitting disc (20A). The crankshaft (22) should turn
easily with little clearance. Tighten fitting screws (24A) to 30 ft.-lbs. (40 NM)
CAUTION: Connecting rod (24) has to be able to be slightly moved sidewise at the stroke journals.
Position Item# Description Torque Amount
24A 07616 Fitting Screw 30 ft-lbs. (40NM)
36 07664 Tensioning Screw 33 ft.-lbs. (45NM)
49A 13160 Nut 103 ft.-lbs.(140NM)
58 07699 Plug 156 ft.-lbs.(210NM)
GP7128 Repair Instructions
GP7128 Torque Specifications