Giant GXR Gxr Series Repair Instructions, GX and HR Pump Part Numbering System

GXR SERIES REPAIR INSTRUCTIONS

21 20 19 18 17

11.Remove the guided p-valve, (19), valve springs (18), v-sleeves

(21)and pressure rings (20). Inspect for wear and replace as necessary. Remove the spacer ring (17) from the plungers (8).

12.If the crankcase oil seals (15) are to be replaced, they can be removed by prying loose with a screwdriver. Take care not to make contact with the plunger (8) and pry out the oil seals from their housing. Seals should not be rein- stalled until after step #16.

13.Reassemble in reverse order. Fill the crankcase with the proper amount of oil (see specifications page 3) The pump is now ready for operation.

For maintenance of the gear end of your pump, contact your local distributor or Giant Industries at: 419/531-4600

NOTE: Contact Giant Industries for Service School Information.

Phone: (419)-531-4600

GX and HR Pump Part Numbering System

						Wobble
		Pressure (in			Thremal	Plate
		100 psi			Relief	Shaft
GX or HR Series	Flow	increments)		Injector Size	Valve	Bore
Vertical	20=GPM	25=2500 PSI		1=2.1 mm	1=1/2"	1=3/4"
Horizontal	23=GPM			2=1.8mm		2=7/8"
	25=GPM			3=2.3mm		3=1"
						4=5/8"
GX or HR	2.5	25	-	1	1	1

For example, a GXV2525-112 is a GX pump that produces 2.5 GPM @ 2500 PSI, has a injector with a 2.1mm Oriface, 1/2" thermal relief valve and 7/8" wobble plate bore.