Giant GP8060, GP8055, GP8065 Valve Inspection and Repair, To Check Seals and Plunger Pipe

GP8055/GP8060/GP8065 PUMP REPAIR INSTRUCTIONS

Valve Inspection and Repair

1) Remove bolts (58).	2) Remove discharge	3) Take out pressure springs
	casing (50B) up and away.	(57A). Pull out assembled
		valves (51 & 52) with fitting tool.

4) The spring tension cap (51A, 52A) is screwed together with the valve seat (51B or 52B). Screw off spring tension cap. Takeout springs (51E, 52E) and valve plate (51C, 52C). Check sealing surfaces and O-rings (51D, 52D). Replace worn parts. Coat threads of valve seat with silicon grease or molycote anti- seize Cu-7439 when reassembling. Before refitting the valves, clean the sealing surfaces in the casing and check for any damage. Tighten caps (58) at 133 Ft-lbs; check torque tension after 8-10 operating hours.

To Check Seals and Plunger Pipe

5)Remove hexagon nuts (49A) and valve casing together with seal case (38) from crankcase (1). If neces- sary, carefully tap the valve casing (50) past the centering stud (50A) using a rubber hammer. IMPORTANT! If necessary, support the valve casing by resting it on wooden blocks or by using a pulley.

6)Remove tension screw (36C) and take seal sleeve (39) together with all mounted parts out of the drive. Pull plunger pipe out of the seal assembly and check for any damage. Carefully, remove seal rings (40) and sleeves (42) with a screw driver.

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