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
GX and HR Pump Part Numbering System
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.
GXR SERIES REPAIR INSTRUCTIONS
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.
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.
NOTE: Contact Giant Industries for
Service School Information.
Phone: (419)-531-4600
For maintenance of the gear end of your
pump, contact your local distributor or
Giant Industries at: 419/531-4600
21 20 19 18 17
