Model GX Series

Triplex Plunger Pump Operating Instructions & Repair Instructions Manual. Horizontal / Vertical Pump with built-in Thermal Relief Valve and Siphon Injector

Table Of Contents

GXH2525A

TABLE OF CONTENTS

Contents

  1. Installation Instructions
  2. Pump Specifications
  3. Parts List
  4. Exploded View / Kits
  5. Torque Specifications
  6. Repair Instructions
  7. Dimensions
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INSTALLATION INSTRUCTIONS

Installation of the Giant Industries Inc., pump is not a complicated procedure, but there are some basic steps common to all pumps.

The following information is to be considered as a general outline for installation.

  1. The pump should be installed flat on a base to a maximum of a 15 degree angle of inclination to ensure optimum lubrication.
  2. The inlet to the pump should be sized for the flow rate of the pump with no unneccessary restrictions that can cause cavitation. Teflon tape should be used to seal all joints. Maximum inlet fluid temperature is 80°F.
  3. The discharge plumbing from the pump should be properly sized to the flow rate to prevent line pressure loss to the work area. It is essential to provide a safety bypass valve between the pump and the work area to protect the pump from pressure spikes in the event of a blockage or the use of a shut-off gun.
  4. Before begining operation of your pumping system, remember: Check that the crankcase and seal areas have been properly lubricated per recommended schedules. Do not run the pump dry for extended periods of time. Cavitation will result in severe damage. Always remember to check that all plumbing valves are open and that pumped media can flow freely to the inlet of the pump.

Danger DANGER: Remember that high pressure operation in a pump system has many advantages. But, if it is used carelessly and without regard to its potential hazard, it can cause serious injury.

IMPORTANT OPERATING CONDITIONS

Failure to comply with any of these conditions invalidates the warranty.

  1. Your Giant Industries replacement pump comes pre-filled to the proper level with synthetic oil although checking for the proper oil level is advised after removing the red shipping plug and installing your black crankcase breather tube.
  2. The proper level of oil in the GXH2525 series pump will be just slightly above half full. This pump does not have a sight glass so you will need to look into the pump from the top in order to view your oil level. The crankcase oil capacity for your GXH2525 Series Horizontal pumps 4.1 ounces of oil.
  3. To change or add oil use only Mobil 1 20W50 Full Synthetic oil
  4. DO NOT OVERFILL CRANKCASE
  5. Crankcase oil should be changed after the first 50 hours of operation, then at regular intervals of 100 hours or less depending on the operating conditions of the pump.
  6. Pump operation must not exceed the rated pressure, volume or a maximum rate of 3450 RPM’S. Failure to follow these instructions could result in damage to your pressure pump.
  7. Do not flow Acids’ Alkaline or Abrasive fluids through your GXH2525 series pressure pump for cleaning purposes. These fluids must be applied with the downstream chemical injector provided with your pressure pump.
  8. Your GXH2525 series pump should be conditioned after every use to help prevent any type of corrosion from building up inside of the part and components of your pump head. We suggest you use Pump Saver Part # 7074403GS, RV Antifreeze or WD-40 to help prevent corrosion inside the brass head of your pump.
  9. Always winterize you pressure pump before storing your pump in climates that will have any chance of below freezing temperatures. A small amount of water left in your pump could cause serious damage to your pump and will not be covered under the manufactures warranty.
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Specifications Model GX Series

Volume
2.5 GPMt
Maximum Discharge Pressure
2600 PSI
Maximum Inlet Pressure
Up to 90 PSIG1
RPM
3450
Plunger Diameter
16mm
Stroke
5.1mm (7.1° angle)
Crankcase Oil Capacity
4.1 fl. oz. (121 ml) Mobile 1 20W 50 Full Synthetic
Temperature of Pumped Fluids
Up to 80°F (27°C)
Inlet Port
1/2" NPT
Discharge Ports
3/8" NPT
Shaft Rotation
Either Direction2
Weight
8 lbs.
Width
8.325"
Height
6.45"
Swash Plate Bore (Horizontal)
3/4" x 3/16" Keyway
Swash Plate Bore (Vertical)
7/8" x 3/16" Keyway
Valve Type
Polyamide Plastic

1A 25 PSIG minimum inlet pressure is required.

2The pump itself can be driven in either direction of rotation; however, the cooling fan on TEFC motors must always be positioned so that the cooling air is drawn from the non-drive end of the motor towards the pump.

HORSEPOWER RATINGS

GX2025 HORSEPOWER REQUIREMENTS
RPM GPM 1000 PSI 1500 PSI 1700 PSI 2500 PSI
3450 2.0 1.4 2.1 2.7 3.4
GX2325 HORSEPOWER REQUIREMENTS
RPM GPM 1000 PSI 1500 PSI 1700 PSI 2500 PSI
3450 2.3 1.6 2.4 3.2 3.9
GX2525 HORSEPOWER REQUIREMENTS
RPM GPM 1000 PSI 1500 PSI 1700 PSI 2500 PSI
3450 2.5 1.7 2.6 3.4 4.3

The rating shown are the power requirements for the pump. Gas engine power outputs must be approximately twice the pump power requirements shown.

We reccomend a 1.15 service factor be specified when selecting an electric motor as the power source. To compute specific pump horsepower requirements, use the following formula:

HP = (GPM X PSI) / 1460

For example, a GXV2325-111 is a GX pump that produces 2.3 GPM @ 2500 PSI, has a injector with a 1.9mm Oriface, 1/2" thermal relief valve & 3/4" swash plate bore.

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GX Series Parts List

Item Part Description Quantity Item Part Description Quantity
1 07805 Radial Shaft Seal 1 29 06227 8mm Ball 1
2* 06310 Adapting Flange 1 30 07917A Washer 1
3 06294 O-Ring (86 x 2.5mm) 1 31 07918A Adjusting Spring 1
4 06300 Rear Bearing 1 32 07919 Pressure Spring 1
5+ 06326 Wobble plate 7.1 degree horizontal, 3/4" 1 33*** 06524 Adjusting Screw 1
5** 06331 Wobble plate 7.1 degree vertical, 7/8" 1 34*** 06324 Adjusting Screw Plug 1
6 06301 Front Bearing 1 35 06286 Manifold 1
7 06289 Spring Disk 3 36 06295 Discharge Valve Cone 3
8 06287 16mm Plunger 3 38 07910A Triangle O-Ring 1
9 06288 Plunger Spring 3 39 06298 Suction Flange 1
10 06299 Socket Bolt (1/4-20x3/4 10.9 GRD) 6 40 06302 Stud Bolt (M8x1.25x50mmGRD8.8SHCS) 4
11 08192 Gasket 1 41**** 12326 Kick Back O-Ring 1
12 06273 Oil Drain Plug 1 42**** 12325 Kick Back Valve Cone 1
13 06282 Crankcase 1 43**** 12328 Kick Back Spring 1
14 08083 Vent Cap (Horizontal Only) 1 44A 06727 Oriface, 1.8mm 1
15 06316 16mm Oil Seal(TTO) 3 44A 06339 Oriface, 2.1mm 1
17 06292 Spacer 3 44A 06340 Oriface, 2.3mm 1
18 07374 Valve Spring 6 45 06312 O-Ring in Nozzle 1
19 06267 Guided P-Valve 3 46 07913 O-Ring 1
20 06290 Pressure Ring 3 47 06303 Injector Retainer 1
21 06315 16mm V-Sleve 3 48 23009 Spring 1
22 06296 Discharge Plug 4 49 23010-0100 Ball 1
23*** 12007 O-Ring 5 50 12516-0001 O-Ring 1
24 06304 Piston 1 51 12517 Hose Barb 1
25 1231-0002 Back-up ring 2 52 07939 Nut 1
26*** 07937 O-Ring 2 53 07044 Locknut 1
27 08638 O-Ring of Push Seat 1 54 07045 Handwheel 1
28 06256 Push in Seat 1 55 07068 Locking Nut W/Nylon Inset 1
56 07046 Cover 1
75 23422-N Thermal Relief Valve 1

MOUNTING ACCESSORIES (Sold Seperately)

Part Description
09103(EX)1 Gasoline Flange Kit
07435 Bolts for 09103

1"EX" Suffix added for engines requiring an externall pilot.

GX SERIES TORQUE SPECIFICATIONS

Position Part Description Torque Amount
10 06299 Socket Bolt 100 in.-lbs.
40 06302 Stud Bolt 50 in.-lbs.
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GX Series EXPLODED VIEW

Plunger Packing Kit #09465

Item Part Description Qty
20 06290 Support Ring 3
21 06315 V-Sleve 3

Valve Assembly Kit #09466

Item Part Description Qty
18 07374 Valve Spring 6
19 06267 Guided P_Valve 3
36 06295 Discharge Valve Cone 3

Oil Seal Kit #09468

Item Part Description Qty
15 06316 Plunger Oil Seal 3

Unloader Repair Kit #09467

Item Part Description Qty
23 12007 Valve Spring 6
25 12031-0002 Back-up Ring 3
26 07937 O-Ring 3
27 08638 O-Ring 3
28 06256 Seat 3
29 06227 8mm Ball 3
41 12326 O-Ring 3
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REPAIR INSTRUCTIONS - GX SERIES

1. With a 14mm socket wrench, remove the three discharge valve plugs (22). Inspect the valve plug o-rings (23) for wear, and replace as necessary.

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 kickback valve spring retainer (47). Inspect the o-ring (46) for wear and replace as necessary. Remove the kickback valve spring (43), kickback valve cone (42), and the o-ring (41) from the manifold (35). Inspect the parts for wear and replace as necessary.

4. With a 19mm wrench, remove the adjusting screw plug (34). Unscrew the adjusting screw (33) from the adjusting screw plug (34. Inspect the o-rings (23 & 26) for wear and replace as necessary.

5. Remove the adjusting spring (31), pressure spring (32), washer (30) and by pass valve ball (29) from the manifold (35). Inspect the parts for wear and replace as necessary.

Optional pump without handle - exclude items (52, 53, 54, 55, 56).

6. With a 14mm socket wrench, remove the guide plug (22) and o-ring (23).

7. Remove the piston (24), o-ring (26), and backup rings (25). Remove the bypas valve seat (28). Inspect the parts for wear and replace as necessary. IMPORTANT! Make sure that the shoulder on bypass valve seat (28) is facing the discharge plug (22).

8. Next, remove the four manifold bolts (40) with a 6mm allen wrench.

9. Remove the suction flange (39) and flange o-ring (38). Inspect the o-ring for wear and replace as necessary.

10. Tap the back of the manifold (35) with a rubber mallet to dislodge, and slide off the plungers. (8). Take note of the position of the discharge port so as to place the manifold in the same position during reassembly.

11. Remove the guided p-valve, (19), valve springs (18), v-sleves (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 reinstalled until after step #16.

GX Series Dimensions inches (mm)

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Allparts Inc.
Allparts Inc.
P.O. Box 158
Plainwell, Michigan 49080

03/11