7
GP7636GB-2.0 REPAIR INSTRUCTIONS
11. Check plunger pipe (36B) and seals (39A, 42) for wear. When replacing plunger pipe (36B), tighten tensioning
screw (36C) to 30 ft-lbs (40 NM). If o-rings (38A) or support rings (38B) are damaged, replace with new parts.
38A
38B
38
38B
38A
36
10. Take tension spring (45) and seal pack (41, 42, 43) out of seal sleeve. Take a thin screw driver and pry out
the grooved ring (39A).
Note: This seal (39A) will not be reusable, so replace with a new part.
For the
seal-pack (41-43), remove with either a socket wrench or use a screw driver to push against the rear lip of
the pressure ring (41) or v-sleeves (42). You will need to remove seals evenly out of the seal sleeve (39).
Be
careful not to score the sleeve or metal parts (41 & 43).
39A
39
41 42
43
45
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 be-
comes 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) to 30 ft.-lbs. (40 Nm). Tighten plunger connection
(36A) onto crosshead (25) with an open end wrench (M36) to 33 ft-lbs. (45 Nm).
13. Push valve casing carefully onto O-rings of seal case and centering studs (50A). Tighten nuts (49A) to 103
ft-lbs. (140 Nm).
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.
IMPORTANT:
Connecting rods are marked for identification. Do not twist con rod halves. Con Rod is to be rein
-
stalled 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. Reas
-
semble 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) must have some sidewise movement at the stroke journals.
