Model
GP7124A
Triplex Ceramic
Plunger Pump
Operating Instructions/
Repair and Service
Manual
Updated 5/98
Contents:
Installation Instructions: page 2
Pump Specifications: page 3
Parts List/Exploded View: pages 4-5
Repair & Service: pages 6-7
Torque Specifications: page 7
Dimensions: back page
Warranty Information: back page
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. If you have
unique requirements, please contact Giant
Industries, Inc. or your local distributor for
assistance.
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 unnecessary restrictions
that can cause cavitation. Teflon tape should be
used to seal all joints. If pumps are to be operated at
temperatures in excess of 140 F, it is important to
insure a positive head to the pump to prevent cavitation.
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. Use of a dampener is necessary to minimize
pulsation at drive elements, plumbing, connections,
and other system areas. The use of a dampener
°
with Giant Industries, Inc. pumps is optional,
although recommended by Giant Industries, Inc.
to further reduce system pulsation. Dampeners
can also reduce the severity of pressure spikes
that occur in systems using a shut-off gun. A
dampener must be positioned downstream from
the unloader.
5. Crankshaft rotation on Giant Industries, Inc.
pumps should be made in the direction designated by the arrows on the pump crankcase.
Reverse rotation may be safely achieved by
following a few guidelines available upon request
from Giant Industries, Inc. Required horsepower
for system operation can be obtained from the
chart on page 3.
6. Before beginning 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.
Finally, 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. Prior to initial operation, add oil to crankcase so
that the oil level is between the two lines on the oil
dipstick. DO NOT OVERFILL. SAE 80 Indus-
trial Gear oil may be used. Crankcase oil should
be changed after the first 50 hours of operation,
then at regular intervals of 500 hours or less depending on operating conditions.
2. Pump operation must not exceed rated
pressure, volume, or RPM.
device must be installed in the discharge of the
system.
3. Acids, alkalines, or abrasive fluids cannot be
pumped unless approval in writing is obtained
before operation from Giant Industries, Inc.
4. Run the pump dry approximately 10 seconds
to drain the water before exposure to freezing
temperatures.
A pressure relief
2
Specifications
Model GP7124A
Volume ........................................................................................................ Up to 12.7 GPM
Discharge Pressure .................................................................................... Up to 10000 PSI
1
Speed .......................................................................................................... Up to 750 RPM
Inlet Pressure .............................................................................................. Up to 90 PSI
2
Plunger Diameter ........................................................................................ 24mm
Plunger Stroke ............................................................................................ 48mm
Crankshaft Diameter .................................................................................. 48mm
Key Width ................................................................................................... 14mm
Crankshaft Mounting .................................................................................. Either side
Shaft Rotation ................................................................................ Top of pulley towards manifold
Temperature of Pumped Fluids................................................................... Up to 140
o
F
Inlet Ports ................................................................................................... (2) 1 1/4" NPT
Discharge Ports .......................................................................................... (2) 3/4" NPT
Weight......................................................................................................... 374 lbs.
Crankcase Oil Capacity .............................................................................. 1.6 Gal.
Fluid End Material....................................................................................... Stainless Steel
Volumetric Efficiency @ 700 RPM ............................................................ 89%
Mechanical Efficiency @ 700 RPM .......................................................... 83%
Consult the factory for special requirements that must be met if the pump is to
operate beyond one or more of the limits specified above.
NOTES:1Intermittent Duty 10.1 GPM @ 10,000 PSI. System Requirements:
No Unloader or Regulator allowed. Must use a safety valve and dump gun.
2
Positive inlet pressures are recommended!
GP7124A HORSEPOWER REQUIRMENTS
RPM GPM 3000 PSI 5000 PSI 6000 PSI 7250 PSI
300 5.1 10.9 18.1 21.7 26.3
400 6.8 14.5 24.2 29.0 35.0
550 9.3 19.9 33.2 39.9 48.2
600 10.1 21.7 36.2 43.5 52.5
650 11.0 23.6 39.3 47.1 56.9
700 11.8 25.4 42.3 50.7 61.3
750 12.7 27.2 45.3 54.3 65.7
RPM GPM 10000 PSI*
600 10.1 71.4
*FOR INTERMITTENT DUTY ONLY!
MUST RUN PUMP WITH A DUMP GUN AND SAFETY VALVE!
AN UNLOADER AND REGULATOR MUST NOT BE USED!
HORSEPOWER RATINGS:
The rating shown are the power requirements for the
pump. Gas engine power outputs must be
approximately twice the pump power requirements
shown above.
We recommend a 1.1 service factor be specified
when selecting an electric motor as the power
source.
To compute specific pump horsepower requirements,
use the following formula:
GPM X PSI
= hp
1400
3
GP7124A PARTS LIST
ITEM PART DESCRIPTION QTY.
1 07600 Crankcase 1
2 13000 Oil Filler Plug Assembly 1
4 07601 Crankcase Cover 1
5 07602 Hexagon Screw 1
8 07603 Oil Dip Stick 1
9 01009 O-Ring, Dip Stick 1
10 13133 Hexagon Screw 12
11 13134 Spring Washer 12
12 07109 Drain Plug 2
13 07182 Gasket, Drain Plug 2
14 07607 Bearing Cover 2
15 07608 Radial Shaft Seal 2
16 07184 O-Ring 2
20 07610 Taper Roller Bearing 2
20A 07611 Fitting Disc (Shim) 1
21 07612 Shaft Protector 1
ITEM PART DESCRIPTION QTY.
34 13137 Flinger 3
36 13138 Plunger 3
38 13408 Stuffing Box 3
39 13409 Seal Case 3
39A 07150 O-Ring 6
39B 07683 Support Ring 6
40 13400 Grooved Seal 3
41 07718 Support Ring 3
42 07685 Packing 3
43 13410 Teflon Support Ring 3
44 13238 Circlip 3
49 13159 Stud Bolt 8
49A 13160 Nut 8
50 13411 Valve Casing 1
50A 13162 Cylinder Stud 2
51 13146 Inlet Valve Assy. 3
22 13405 Crankshaft 1
23 07614 Key 1
24 13182 Connecting Rod Assy. 3
24A 13406 Fitting Screw 6
24B 13407 Washer 6
25 13183 Crosshead Assy. 3
28 13184 Crosshead Pin 3
30 07619 Cover Plate 1
30A 07225 Hexagon Screw 8
30B 13136 Grommet 4
30C 07622 Washer 8
30D 13154 Cover 1
31 07623 Eye Bolt 1
32 07624 Radial Shaft Seal 3
32A 07625 Shaft Seal 3
33 07626 Seal Retainer 3
33A 07627 O-Ring 3
51A 07693 Support Ring 6
51B 12055 O-Ring 6
51C 13131 Inlet Valve Seat 3
51D 13130 Valve Plate 6
51E 07062 Valve Spring 6
51F 13147 Spacer Pipe 6
52 13148 Discharge Valve Assy. 3
52C 13149 Discharge Valve Seat 3
58 07699 Plug 3
58A 07700 O-Ring 3
58B 07701 Support Ring 3
58C 07702 Hexagon Screw 12
59 07703 Plug 3
59A 07704 Seal 3
60 12253 Plug G 3/4 1
61 12251 Plug G 1-1/4 1
66 13362 Disc for Crankshaft 1
33B 07628 Circlip 3
67 13358 Hexagon Screw 1
4
Exploded View - GP7124A
5
GP7124A REPAIR INSTRUCTIONS
NOTE: Always take time to lubricate all metal and non-metal parts with a light film of oil
before reassembling. This step will help ensure proper fit, at the same time protecting
the pump non-metal parts (elastomers) from cutting and scoring.
TO CHECK VALVES
Lossen screws (58C), take plugs (58) out of valve casing with two screws. Take out complete valve (51)
using either tool (part #07662) or stud bolt. Valve seats (51C and 52C) are pressed out of spacer pipe
(51F) by hitting the valve plate (51D) with a bolt. Check surfaces of valve plate, valve seat, O-rings (51B,
58A) and replace worn parts.
CAUTION: When reassembling: The suction valve seat (51C) is 1mm smaller in diameter than the
discharge valve seat (52C). Suction valve seats are marked "S" and always have to be
installed first. Discharge valve seats are marked "P" and are always tobe installed on top of
suction valve. Plugs (58) are to be tensioned down evenly with screws (58C) and crosswise
at 210NM.
TO CHECK SEALS AND PLUNGER PIPE
Loosen nuts (49A) and remove pump head. Separate plunger (36) from crosshead (25) by means of two
open-end wrenches (size 22 and 27). Pull seal sleeves (38) out of their fittings in the crankcase. Take seal
case (39) out of seal sleeve (38). Take seal-pack (40-43) out of seal sleeve. After removing the circlip ring
(44) take seal-pack (43A-C) out of seal sleeve (38).
Examine plunger (36) and seals (40,42,43B).
When replacing plunger (36), tighten new plunger to 26 ft.lbs.
Replace worn parts; grease seals with Silicone before installing.
CAUTION: Don't loosen the 3 plunger (36) before the valve casing has been removed otherwise the
plunger (36) could hit against the spacer pipe (51F) when the pump is being turned.
Seal life can be increased if the pretensioning allows for a little leakage. This assists lubrication and keeps the seals cool. It is therefore not necessary to replace seals before the leakage becomes too heavy and causes output and operating pressure to drop.
6
GP7124A REPAIR INSTRUCTIONS
MOUNTING VALVE CASING
Check O-rings (39A) and support rings (39B) on seal case (39). Clean surfaces of seal sleeves in gear box
and sealing surfaces of valve casing.
Push valve casing carefully onto O-rings of seal case and centering studs (50A). Tighten nuts (49A) to103
ft-lbs.
TO DISASSEMBLE GEAR
Take out plunger and seal sleeves as described above. Drain oil. After removing the circlip ring (33B), lever
out seal retainer (33) with a screw driver. Check seals (32,32A,33A) and surfaces of crosshead. Remove
crankcase cover (4). Loosen inner hexagon screws on the connecting rods (24) and push con rod halves as
far into the crosshead guide as possible.
CAUTION: Connecting rods are marked for identification. Do not twist con rod halves. Con Rod is to be
reinstalled in the same position on shaft journals.
Check surfaces of connecting rod and crankshaft (22)
Take out bearing cover to one side and push out crankshaft taking particular care that the con rod doesn't
get bent.
CAUTION: Seal (32A) must always be installed so that the seal-lip on the inside diameter faces the oil.
Reassemble in reverse order: Regulate axial bearing clearance - minimum 0.1mm, maximum
0.15mm-by means of fitting disc (20A). Shaft should turn easily with little clearance. Tighten
inner hexagon screws to 30 ft.-lbs.
CAUTION: Connecting rod has tobe able to be slightly moved sidewise at the stroke journals.
GP7124A TORQUE SPECIFICATIONS
Position Item# Description Torque Amount
10 13133 Hexagon Screw 30 (ft.-lbs)
36 13138 Plunger 26 (ft.-lbs.)
49 A 13160 N u t 103 (ft.-lbs)
7
GP7124A Dimensions (Inches)
GIANT INDUSTRIES LIMITED WARRANTY
Giant Industries, Inc. pumps and accessories are warranted by the manufacturer to be free from
defects in workmanship and material as follows:
1. For portable pressure washers and car wash applications, the discharge manifolds
will never fail, period. If they ever fail, we will replace them free of charge. Our other pump
parts, used in portable pressure washers and in car wash applications, are warranted
for five years from the date of shipment for all pumps used in NON-SALINE, clean
water applications.
2. One (1) year from the date of shipment for all other Giant industrial and consumer
pumps.
3. Six (6) months from the date of shipment for all rebuilt pumps.
4. Ninety (90) days from the date of shipment for all Giant accessories.
This warranty is limited to repair or replacement of pumps and accessories of which the
manufacturers evaluation shows were defective at the time of shipment by the manufacturer. The
following items are NOT covered or will void the warranty:
1. Defects caused by negligence or fault of the buyer or third party.
2. Normal wear and tear to standard wear parts.
3. Use of repair parts other than those manufactured or authorized by Giant.
4. Improper use of the product as a component part.
5. Changes or modifications made by the customer or third party.
6. The operation of pumps and or accessories exceeding the specifications set forth
in the Operations Manuals provided by Giant Industries, Inc.
Liability under this warranty is on all non-wear parts and limited to the replacement or repair of those
products returned freight prepaid to Giant Industries which are deemed to be defective due to
workmanship or failure of material. A Returned Goods Authorization (R.G.A.) number and
completed warranty evaluation form is required
under warranty consideration. Call (419)-531-4600 or fax (419)-531-6836 to obtain an R.G.A.
number.
Repair or replacement of defective products as provided is the sole and exclusive remedy provided
hereunder and the MANUFACTURER SHALL NOT BE LIABLE FOR FURTHER LOSS, DAMAGES,
OR EXPENSES, INCLUDING INCIDENTAL AND CONSEQUENTIAL DAMAGES DIRECTLY OR
INDIRECTLY ARISING FROM THE SALE OR USE OF THIS PRODUCT.
THE LIMITED WARRANTY SET FORTH HEREIN IS IN LIEU OF ALL OTHER WARRANTIES OR
REPRESENTATION, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY WARRANTIES OR MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE AND ALL SUCH
WARRANTIES ARE HEREBY DISCLAIMED AND EXCLUDED BY THE MANUFACTURER.
prior to the return to Giant Industries of all products
GIANT INDUSTRIES, INC. 900 N. Westwood Ave., P.O. Box 3187, Toledo, Ohio 43607
Phone: (419)-531-4600 FAX (419)-531-6836, www.giantpumps.com
Ó Copyright 1998 Giant Industries, Inc.
5/98 GP7124A.PM6
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