Giant GP7124A-4000 User manual

Contents:
Pump Speci cations: page 2
Installation Instructions: page 3
Exploded View: page 4
Parts List: page 5
Kits: page 6
Torque Speci cations: page 6
Recommended
Spare Parts List: page 6
Repair & Service: pages 7
Dimensions: back page
Warranty Information: back page
Triplex Ceramic
Plunger Pump
Operating Instructions/
Repair and Service Manual
Model
GP7124A-4000
Updated 07/23

2
1. Performance
U.S.. Metric
Volume........................................................................12.8 GPM .........................................48.4 L/min
Discharge Pressure....................................................7400 PSI............................................... 510 Bar
Inlet Pressure*............................................................-4.35 to 58 PSI* ........................... -0.3 to 4 Bar*
Speed .....................................................................................................................................750 RPM
Plunger Diameter........................................................0.94” ........................................................24mm
Plunger Stroke............................................................2.05” ........................................................52mm
Crankshaft Diameter...................................................1.9” ..........................................................48mm
Key Width ...................................................................0.55” ........................................................14mm
Crankshaft Mounting ............................................................................................................Either side
Shaft Rotation....................................................................................... Top of pulley towards manifold
Temperature of Pumped Fluids ..................................Up to 140o F.............................................. 60o C
Inlet Ports .......................................................................................................................(2) 1 1/4” NPT
Discharge Ports.................................................................................................................(2) 3/4” NPT
Weight ........................................................................454 lbs....................................................206 kg
Crankcase Oil Capacity..............................................1.7 Gallons .........................................6.5 Liters
Fluid End Material..........................................................................................................Stainless Steel
Volumetric E󰀩ciency @ 700 RPM................................................................................................. 89%
Mechanical E󰀩ciency @ 700 RPM ............................................................................................... 83%
GP7124A-4000
1) Figures given for maximum pressure and maximum speed (rpm) apply to intermittent operation with cold
water. When the pump is used in continuous operation and/or with water warmer than 100 °F (40°C), these
values must be reduced by 10%.
Performance data for intermittent operation, data for continuous operation on request. For information on
intermittent operation and calculating of the performance data, see the Giant Industries assembly instructions.
NPSHR / Inlet pressure
Required NPSH refers to water at 68 °F (20 °C) at maximum permissible pump speed.
The inlet pressure on the suction side must not exceed 145 PSI (10 bar).
Level of noise emission
Emission sound pressure level: ≤ 93 dB(A)
2. Fields of application
The elds of application of these pump types correspond to the specications in the assembly instructions
GIANT INDUSTRIES.
Ambient conditions
Ambient temperature: 36 °F (2 °C) < T Amb. < 86 °F (30 °C)
4. Oil lling
• Filling quantity: 1.7 gal (6.5 L)
• Quality: Industrial gear oil ISO VG 220 or automotive gear oil SAE 90 GL4 - Giant’s p/n 01154
• Intervals: First oil change after 50 operating hours then every 1000 operating hours, but at the
latest 12 months
GP7124A-4000 HORSEPOWER REQUIREMENTS
RPM GPM 5000 PSI 6000 PSI 7000 PSI 7400 PSI
400 6.8 23.5 28.3 32.8 34.7
550 9.4 32.4 38.9 45.4 48.0
600 10.2 35.2 42.2 49.2 52.1
650 11.1 38.3 45.9 53.6 56.7
700 12.0 41.4 49.7 57.9 61.2
750 12.8 44.1 53.0 61.8 65.3
*Positive inlet pressures are recommended

3
6. Installation/Putting into
Operation
6.1 Shaft protector
When the pump is in operation, the open shaft
end must be covered up by shaft protector (21),
the driven shaft side and coupling by a bell
housing and the plunger room by cover (30).
6.2 Direction of pump rotation
Set the direction of rotation of the drive unit
according to the direction of rotation arrow on the
crankcase.
6.3 Suction line  lter
Recommended mesh size 50 µm
7. Operation
The maximum operating pressure can be used in
the speed range of 750 RPM. When reducing the
speed, the pump pressure must be reduced in
the same proportion to ensure su󰀩 cient gearbox
lubrication.
7.1 Discharge Line
The pump comes with two special conical
seals (50D) which have to be inserted in to the
discharge ports of the pump. One of the two ports
is to be closed with the included plug (50E).
To install the pressure line, the connection nipple
(50C) with the external thread
1/2”-14 FNPT must be used. This together with
the sealing cone (50D) seals the pressure line.

4
Exploded View - GP7124A-4000

5
GP7124A-4000 PARTS LIST
ITEM PART DESCRIPTION QTY.
1 05769 Crankcase 1
1A 05525 Head for Oil Dipstick 1
1B 01009 O-Ring 1
2 13000 Oil Filler Plug Assembly 1
4 07601 Crankcase Cover 1
5 05798 Seal for Crankcase Cover 1
8 07603 Oil Dip Stick Assembly 1
9 01009 O-Ring, Dip Stick 1
10 22706 Hexagon Screw 8
11 06725 Spring Washer 8
12 07109-0400 Drain Plug 6
13 06272 Copper Seal Ring, 1/2” 6
14 05770 Bearing Cover 2
14A 12204 O-Ring 8
15 05771 Radial Shaft Seal 2
16 05772 O-Ring for Bearing Cover 2
17 05642 Hexagon Socket Screw 8
18 05039 Spring Washer 8
20 05773 Taper Roller Bearing 2
20A 07611 Shim, 0.1 mm 1-8
21 05645 Shaft Guard Protector 1
21A 05646 Shaft Guard 1
22 05775 Crankshaft 1
23 07614 Key 1
24 05777 Connecting Rod Assembly 3
25 05778 Crosshead Assembly 3
28 05779 Crosshead Pin 3
30 07619 Cover Plate 1
30A 07225-0100 Hexagon Screw 8
30B 13136 Grommet 4
30C 08280 Disc 8
30D 13154 Cover 1
31 07623 Eye Bolt 1
32 07624 Radial Shaft Seal 3
33 06950 Seal Retainer 3
33A 07627 O-Ring for Seal Retainer 3
33B 06951 Circlip for Seal Retainer 3
33C 07249 Fitting Disc 3
34 13137 Oil Scraper (Flinger) 3
36 13138 Plunger 3
38 06952 Seal Sleave 3
38A 22764 Serrated Pin 3
38B 06750 Leakage Gasket 3
38C 06667 O-Ring 3
39 06953 Seal Case 3
39A 07150 O-Ring 6
40 13143 Tension Spring 3
41 06955 Support Disc 3
42 07685 Spiral Ring (Packing) 6
43 07718 Support Ring 6
44 06956 Guide Ring 3
45 06957 Pressure Ring 3
ITEM PART DESCRIPTION QTY.
46 07169 Leakage Seal 3
47 06758 Spacer Disc 3
48 05524 Circlip 3
49 13159 Stud Bolt 8
49A 13160 Hexagon Nut 8
50 06759-NPT* Valve Casing Assembly
(50C-E) 1
50A 13162 Centering Stud 2
50C 03397 Connection Nipple,
1/2” FNPT 1
50D 03398 Lens Gasket 2
50E 03399 Plug, 3/4” BSP 1
51 05780 Inlet Valve Assembly
(51B-F) 3
51B 05193 O-Ring 3
51C 05194 Inlet Valve Seat 3
51D 06761 Valve Plate 3
51E 06762 Valve Spring 3
51F 06763 Spacer Pipe 3
52 05781 Discharge Valve Assembly
(52B-F) 3
52B 05193 O-Ring 3
52C 05195 Discharge Valve Seat 3
52D 06791 Valve Plate 3
52E 06762 Valve Spring 3
52F 06763 Spacer Sleeve 3
57 06078 Tension Spring 3
58 07699 Plug 3
58A 07700 O-Ring 3
58B 07693 Support Ring 3
58C 07702 Hexagon Screw 12
59 07109-0400 Plug 3
59A 06807 Copper Ring (Gasket) 3
61 12251 Plug 1-1/4” NPT 1
62 03401 Connecting Joint 2
62A 06766 Connection Ring 2
62B 06767 Seal Ring 4
64 07204-0100 Steel Ring 2
66 13362 Disc for Crankshaft 1
67 13358 Hexagon Screw 1
69 06588 Screw-in Connector 2
70 06768 Threaded Elbow 2
71 06769 Curved Leakage Pipe 2
07662 Valve Tool (not shown) 1
17212 Crankcase Assembly
(2x12/1-34/49/49A/50A/66/67)
17407-NPT Pump Head Assembly
(50-71 w/out 50A/66/67)
17262 Plunger Conversion Kit (36-48)
*If the valve casing (50) needs to be replaced,
items 50C-E will be included.

6
Inlet Valve Assembly Kit #09702
Item Part # Description Qty.
51B 05193 O-Ring 3
51C 05194 Inlet Valve Seat 3
51D 06761 Valve Plate 3
51E 06762 Valve Spring 3
58A 07700 O-Ring 3
58B 07693 Support Ring 3
Discharge Valve Assembly Kit #09703
Item Part # Description Qty.
52B 05193 O-Ring 3
52D 06761 Valve Plate 3
52E 06762 Valve Spring 3
52C 05195 Discharge Valve Seat 3
58A 07700 O-Ring 3
58B 07693 Support Ring 3
GP7124A-4000 REPAIR KITS
Preventative Maintenance Check-List & Recommended Spare Parts List
Check Daily Weekly 50hrs Every Every Every
500 hrs 1500 hrs 3000 hrs
Oil Level/Quality X
Oil Leaks X
Water Leaks X
Belts, Pulley X
Plumbing X
Recommended Spare Parts
Oil Change X X
Plunger Spare Parts (1 kit/pump) X
(See page 6 for kit list)
Oil Seal Kit (1 kit/pump) X
(See page 6 for kit lit)
Valve Spare Parts (1 kit/pump) X
(See page 6 for kit list)
Plunger Packing Kit #09224A
Item Part # Description Qty.
38B 06750 Leakage Gasket 3
38C 06667 O-Ring 3
39A 07150 O-Ring 6
42 07685 Packing 6
43 07718 Support Ring 6
44 06956 Guide Ring 3
46 07169 Seal Ring 3
48 05524 Circlip 3
Oil Seal Kit #09221
Item Part # Description Qty.
32 07624 Radial Shaft Seal 3
33A 07627 O-Ring 3
GP7124A-4000 TORQUE SPECIFICATIONS
Position Item # Thread Description Lubricaion Info Torque Amount
10 22706 M10 Hexagon Screw 33 ft.-lbs. (45 Nm)
12 07109-0400 1/2” BSP Drain Plug 59 ft.-lbs. (80 Nm)
15 05771 Radial Shaft Seal Loctite 403
17 05642 M12 Hexagon Socket Screw 64 ft.-lbs. (87 Nm)
24 05777 M10 Connecting Rod Assembly 30 ft.-lbs. (40 Nm)
32 07624 Radial Shaft Seal Loctite 403
36 13138 Plunger 33 ft.-lbs. (45 Nm)
38 06952 Seal Sleeve Cu-Paste
Crankcase Side
49 13159 Stud Bolt Loctite 648
Crankcase side
49A 13160 M16 Hexagon Nut 133 ft.-lbs. (180 Nm)
58C 07702 M16 Hexagon Screw Pro Pack 550 155 ft.-lbs. (210 Nm)

7
8. Maintenance and Servicing
Based on the thread type and the required
tightening torques, observe the table on page 6.
8.1 Special tools required
The following special tools are required for
assembly:
- Extraction tool (part number 07662)
- Pull-out tool size 2
- Snap-ring tongs
8.2 Suction and Discharge Valves
Loosen screws (58C).
Take plugs (58) out of valve casing with two
screws.
Take out tension spring (57) and complete valve
(51, 52) using either tool (07662) or stud bolt
(size M16).
Valve seats (51C and 52C) are pressed out of
spacer pipe (51F, 52F) by hitting the valve plate
(51D, 52D) with a bolt.
Check surfaces of valve plate, valve seat,
O-rings (51B, 58A) and support ring (58B) for
damage.
Replace worn parts.
When reassembling, the suction valve
seat (51C) is 1 mm smaller in diameter
than the discharge valve seat (52C).
Suction valve seats are marked “S” and
always have to be installed  rst.
Discharge valve seats are marked “P” and are
always to be installed on top of suction valve.
Plugs (58) are to be tensioned down evenly
with screws (58C) and crosswise to the required
torque.
8.3 Seals and Plunger
Remove nuts (49A) and pull off pump head.
Take off cover plate (30).
Using a size 27 open-end wrench, separate
plunger (36) from crosshead (25).
Don’t loosen the 3 plungers (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.
Remove seal sleeve (38) together with the
plunger (36) from the crankcase guides (use
ring groove as an aid).
Take seal case (39) out of seal sleeve (38).
Remove plunger (36) from seal sleeve.
Take pressure spring (40), support disc (41),
seal unit (42/43/44) and pressure ring (45) out of
the seal sleeve.
Remove leakage gasket (38B) from serrated pin
(38A) on the seal sleeve (38).
Take-off circlip (48) using a clipring pliers, pull
out spacer disc (47).
Lever grooved seal (46) out of the seal sleeve
(38).
Check plunger surface (36), seal unit (42/43/44),
leakage gasket (38B) and seal ring (46).
Check O-rings (38C/39A) on the seal case (39)/
seal sleeve (38).
Replace worn seals.
The Ø3.2mm bore of the leakage
gasket (38B) must be inserted directly
on to the serrated pin (38A) of the seal
sleeve (38A).
The leakage gasket (38B) must be  tted to the
seal sleeve (38) so that the bevelled surface of
the gasket (38B) faces outwards.
When exchanging worn plunger, attention must
be paid that the centre bore and front surface of
the crosshead (25) are free of dirt and damage.
Thread new plunger carefully through oiled
seals in seal sleeve.
Coat thread of new plunger lightly with suitable
bonding agent.
Then insert seal sleeve with plunger into
crankcase guide. Drive Crankshaft until plunger
with crosshead (25) pushes against plunger
(36).
Tighten plunger (36) to the required torque using
a size 27 torque wrench.
Mounting Valve Casing:
Clean surfaces of seal sleeves (38) in gear box
and sealing surfaces of valve casing.
Push valve casing carefully onto O-rings of seal
case and centring studs (50A).
Tighten nuts (49A) to the required torque.
If required, supplementary assembly
instructions can be requested from Giant
Industries.

GIANT INDUSTRIES, INC. 900 N. Westwood Ave., Toledo, Ohio 43607
Phone: [phone] FAX [phone], www.giantpumps.com
 Copyright 2023 Giant Industries, Inc.
07/23 GP7124A-4000.indd
Dimensions - GP7124A-4000 - Inches (mm)
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. Five (5) years from the date of shipment for all pumps used in portable pressure
washers with NON-SALINE, clean water applications.
2. Two (2) years from the date of shipment for Giant pumps used in car wash
applications.
3. One (1) year from the date of shipment for all other Giant industrial and consumer
pumps.
4. Six (6) months from the date of shipment for all rebuilt pumps
5. 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 manufacturer’s
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 modi cations made by the customer or third party.
6. The operation of pumps and or accessories exceeding the speci cations 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
prior to the return to Giant Industries of all products 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.
WARNING: This product might contain a chemical known to the State of California to cause cancer,
and birth defects or other reproductive harm.
For more information go to www.P65Warnings.ca.gov