GXR Series rep

GXR Series rep
GXR SERIES REPAIR INSTRUCTIONS
1. With a 14mm socket
wrench, remove the
three discharge valve
plugs (27).Inspect the
valve plug o-rings (23)
for wear, and replace as
necessary.
4. Next, remove the four
manifold bolts (40) with a
6mm allen wrench.
2. Remove the valve spring
(18) and valve cone
(36) from the manifold
(35). Inspect the parts
for wear and replace as
necessary.
3. With a crescent wrench,
remove the injector retainer (47). Inspect the
o-ring (46) for wear and
replace as necessary.
5. Remove the suction flange 6. Tap the back of the manifold (35) with a rubber
(39) and flange o-ring (38).
mallet to dislodge, and
Inspect the o-ring for wear
slide off the plungers. (8).
and replace as necessary.
Take note of the position
of the discharge port so
as to place the manifold in
the same position during
reassembly.
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GXR SERIES REPAIR INSTRUCTIONS
21
20
19
18
17
7. 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).
8. 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 reinstalled until after step #16.
9. 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
Injector Size
Thermal
Relief
Valve
Wobble
Plate
Shaft
Bore
1=2.1mm
1=1/2”
2=7/8”
GX or HR Series
Flow
Pressure (in
100 psi
increments)
Vertical
20=GPM
25=2500 PSI
Horizontal
23=GPM
2=1.8mm
1=3/4”
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.
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