Giant P426HHP User manual

Model
P426HHP Pump
Contents: Page
Installation Instructions: 2
Pump Specications: 3
Exploded View: 4
Parts List/Kits: 5
Repair Instructions: 6-10
Torque Specications 10
Trouble Shooting Chart: 11
Recommended Spare Parts List: 11
Dimensions: back page
Warranty Information: back page
Triplex Ceramic
Plunger Pump
Operating Instructions/
Repair and Service Manual
Hydraulic Drive Pump

INSTALLATION INSTRUCTIONS
Safety Rules
A safety valve is to be installed in accordance
with the guidelines for liquid spraying units
so that the admissible operating pressure
cannot be exceeded by more than 10%. Pump
operation without a safety valve as well as
any excess in temperature or speed limits
automatically voids the warranty.
When the pump is in operation, the drive shaft
end and the coupling must be enclosed by a
protective cover or a coupling bell.
Pressure in the discharge line and pump must
be at zero before any maintenance to the pump
takes place. Close suction line. Disconnect
fuses to ensure that the driving motor does not
get switched on accidentally.
Make sure that all parts on the pressure side
of the unit are vented before starting the pump.
In order to prevent air, or an air-water mixture
being absorbed and to prevent cavitation
occuring, the pump NPSHR suction head and
water temperature must be respected.
Cavitation and/or compression of gases lead
to uncontrollable pressure kicks which can ruin
pump and unit parts and also be dangerous to
the operator or anyone standing nearby.
Giant plunger pumps are suitable for pumping
clean water and other non-agressive or non-
abrasive media with a specic weight similar to
water.
Before pumping other liquids - especially
inammable, explosive and toxic media - the
pump manufacturer must be consulted with
regard to the resistance of the pump material.
It is the responsibility of the equipment
manufacture and/or operator to ensure that all
pertinent safety regulations are adhered to.
Required NPSH refers to water (specic
weight 1kg/dm3, viscosity 1°E) and maximum
premissible pump revolutions.
Operation and Maintenance
Check oil level prior to starting and ensure
trouble-free water supply.
Important! If there is a danger of frost, the
water in the pump and in the pump ttings
(particularly the unloader valve) must be
emptied. The second discharge port can be
used and the pump run “dry” for 1-2 minutes for
this purpose.
Oil: Use only 27.1 uid ounces (0.8 liters) of
ISO VG 220 GL4 (e.g. Aral Degol BG220) or
SAE 90 GL4 gear oil (Giant p/n 01154).
Initial oil change after 50 operating hours and
then every 500 hours,after 1 year if used less.
Caution: When operating in damp places or
with high temperature uctuations, oil must
be changed immediately [should condensate
(frothy oil) occur in the gear box].
NPSH values must be observed.
Maximum input pressure 145 PSI (10 bar),
maximum suction head -4.35 PSI (-0.3 bar).
Make sure that suction pulsation is su󰀩ciently
dampened - water column resonance must be
avoided.
Important! If the pump is not used for a long
period of time, it is possible the seals (23) could
become hard or brittle thus causing the pump to
leak when put into operation.
If this is the case, we recommend these seals
be replaced every 4 years.

3
NOTES:
In order to drive the pump from the side opposite the present shaft exten-
sion, simply remove the valve casing from the crankcase and rotate the
pumps 180 degrees to the desired position. Be certain to rotate the seal
case (item #20) as well, so that the weep holes are down at the six o’clock
position. Exchange the oil ll and the oil drain plugs, also. Refer to the
repair instructions as necessary for the proper assembly sequence.
To Determine the Torque of a Hydraulic Motor: Torque (in-lbs) = (GPM x PSI x 36.77) / RPM
Consult the factory for special requirements that must be met if the
pump is to operate beyond one or more of the limits specied above.
SPECIAL NOTE:
The theoretical gallons per revolution
(gal/rev) is 0.00986. To nd specic
outputs at various RPM, use the
formula: GPM = 0.00986 x RPM
U.S. (Metric)
Flow (continuous) .........................................Up to 14.3 GPM ............. (54 L/min)
Flow (intermittent) .........................................18 GPM........................... (68.1 L/min)
Maximum Discharge Pressure .....................Up to 3000 PSI ............... (200 bar)
Maximum Inlet Pressure ...............................145 PSI ........................... (10 bar)
Power Required ............................................27.1 BHP......................... (20.7 kW)
Stroke ...........................................................0.97” ................................ (24.6 mm)
RPM (continuous) .................................................................................. 1450 RPM
RPM (intermittent).................................................................................. 1825 RPM
Plunger Diameter..........................................1.02” ................................ (26 mm)
Temperature of Pumped Fluids.....................Up to 160 oF ................... (70 oC)
Inlet Ports...............................................................................(1) 1” BSP, (2) 3/4” BSP
Discharge Ports ..................................................................................... (2) 3/4” BSP
Crankshaft Bore............................................SAE 2B or SAE 4B 13T 16/32 Spline*
Shaft Rotation ........................................................................................ Towards uid end
Crankshaft Diameter.............................................................................. (28 mm)
Key Width .............................................................................................. (8 mm)
Shaft Mounting....................................................................................... Either side1
Weight...........................................................39.7 lbs. .......................... (18 kg)
Crankcase Oil Capacity ................................27.1 .oz. ........................ (0.8 liters)
*J498b 30° Class 5
Model P426HHP Specications
P426HHP HORSEPOWER REQUIREMENTS
RPM GPM 1000 PSI 1500 PSI 2000 PSI 3045 PSI
785 7.7 5.3 8.0 10.6 16.2
900 8.9 6.1 9.2 12.3 18.7
1010 10.0 6.9 10.3 13.8 21.0
1120 11.1 7.7 11.5 15.3 23.3
1240 12.2 8.4 12.6 16.8 25.6
1450 14.3 8.8 14.8 19.7 30.0

4
P426HHP Pump Exploded View

5
ITEM PART DESCRIPTION QTY.
1 08377 Crankcase 1
2 08378 Oil Fill Plug with Gasket 1
3 06479 Crankcase Cover 1
3A 07186 Oil Sight Glass w/ Gasket 1
4 08380 O-Ring 1
5 07109 Oil Drain Plug, 1/2” BSP 1
5A 06015 O-Ring 1
5B 08092 Plug with Gasket 1
6 01010 Screw 4
6A 01011-0400 Spring Washer 4
7 04739 Bearing Cover Open 1
7A 03266 Motor Flange 1
7B 03297 Plug, M12 x 1 1
8 05291 Bearing Cover Closed 1
8A 05292 Shim 1-3
8B 05293 Shim 1
8C 05964 Shim 2
9 01016 O-Ring 2
10 07114 Hexagon Socket Screw 4
10A 07774 Hexagon Socket Screw 4
11 07459 Radial Shaft Seal 1
12 05350 Taper Roller Bearing 2
13 03446 Crankshaft 1
14 03295 Magnet 1
15 08390 Connecting Rod Assembly 3
15A 05349 Connecting Rod Screw 6
15B 05348 Adapter Sleeve 6
16 03092 Plunger Assembly (16A-G) 3
16A 05352 Plunger Base 3
16B 04653 Plunger Pipe 3
16D 08399 Tensioning Screw 3
P426HHP Pump Spare Parts List
ITEM PART DESCRIPTION QTY.
16E 07023 O-Ring 3
16F 07203 Backup Ring 3
16G 07258 Copper Washer 3
17 06790 Crosshead Pin 3
19 05444 Oil Seal 3
20 04654 Seal Case 3
20A 07266 O-Ring 3
21 04655 Seal Sleeve 3
21A 07281 O-Ring 6
21B 05967 Support Ring 6
22 04656 Drip Return Ring 3
23 04657 Grooved Seal 3
23A 04658 Support Ring 3
24 04657 Grooved Seal 3
24A 04660 Support Ring 3
25 04661 Seal Casing 1
25B 02009 O-Ring 2
26 04662 Manifold 1
27A 06936 Valve Assembly (27-31) 6
27 06937 Valve Seat 6
28 06938 Valve Plate 6
29 06377-0100 Valve Spring 6
30 06939 Valve Spring Retainer 6
31 07212 O-Ring 6
32 05971 Plug, M33 x 1.5 3
33 05972 O-Ring 3
34 05973 Cap Screw 8
36 07703 Plug, 3/4” BSP 1
36A 04663 Seal Ring 3
37 04664 Plug, 3/4” BSP 2
P426HHP Pump Repair Kits
Plunger Packing Kits
# 09829
Item Part # Description Qty
20A 07266 O-Ring 3
21A 07281 O-Ring 6
21B 05967 Support Ring 6
23 04657 Grooved Seal 3
24 04657 Grooved Seal 3
24A 04660 Support Ring 3
25B 02009 O-Ring 2
Valve Assembly Kit
# 09724
Item Part # Description Qty.
27A 06936 Valve Assembly, Complete 6
33 05972 O-Ring 6
Oil Seal Kit
# 09641
Item Part # Description Qty
19 05444 Oil Seal 3

6
P426HHP Pump Repair Instructions
 Note:Alwaystaketimetolubricateallmetalandnonmetalpartswithalightlmofoilbeforereassembly.Thisstepwill
ensurepropert,atthesametimeprotectingthepumpnonmetalparts(i.e.,theelastomers)fromcuttingandscoring.

7
P426HHP Pump Repair Instructions

8
P426HHP Pump Repair Instructions

9
P426HHP Pump Repair Instructions

10
P426HHP Pump Repair Instructions
Torque Specications - P426HHP
Item # Part # Description Lubrication U.S. (Metric)
3A 07186 Oil Sight Glass w/Gasket Loctite 5910 106 in.-lbs. (12 Nm)
5 07109 Oil Drain Plug 59 ft.-lbs. (80 Nm)
5B 08092 Plug with Gasket 59 ft.-lbs. (80 Nm)
6 01010 Screw 110 in.-lbs. (12.5 Nm)
10 07114 Screw with Washer 133 in.-lbs. (15 Nm)
15 08390 Connecting Rod Assembly 97 in.-lbs. (11 Nm)
16D 08399 Tensioning Screw Loctite 243 21 ft.-lbs. (28 Nm)
32 05971 Plug Loctite 243 107 ft.-lbs. (145 Nm)
34 05973 Cap Screw Lightly oil threads 30 ft.-lbs. (40 Nm)

11
PUMP SYSTEM MALFUNCTION
MALFUNCTION CAUSE REMEDY
The Pressure and/ Worn packing seals Replace packing seals
or the Delivery Broken valve spring Replace spring
Worn or Damaged nozzle Replace nozzle
Fouled discharge valve Clean valve assembly
Fouled inlet strainer Clean strainer
Worn or Damaged hose Repair/Replace hose
Worn or Plugged relief valve on pump Clean, Reset, and Replace worn parts
Cavitation Check suction lines on inlet of
pump for restrictions
Unloader Check for proper operation
Water in crankcase High humidity Reduce oil change interval
Worn seals Replace seals
Noisy Operation Worn bearings Replace bearings, Rell crankcase
oil with recommended lubricant
Cavitation Check inlet lines for restrictions
and/or proper sizing
Rough/Pulsating Worn packing Replace packing
Operation with Inlet restriction Check system for stoppage, air
Pressure Drop leaks, correctly sized inlet
plumbing to pump
Accumulator pressure Recharge/Replace accumulator
Unloader Check for proper operation
Cavitation Check inlet lines for restrictions
and/or proper size
Pressure Drop at Gun Restricted discharge plumbing Re-size discharge plumbing to
ow rate of pump
Excessive Worn plungers Replace plungers
Leakage Worn packing/seals Adjust or Replace packing seals
Excessive vacuum Reduce suction vacuum
Cracked plungers Replace plungers
Inlet pressure too high Reduce inlet pressure
High Crankcase Wrong Grade of oil Giant oil is recommended
Temperature Improper amount of oil in crankcase Adjust oil level to proper amount
Preventative Maintenance Check List & Recommended Spare Parts List
Check Daily Weekly 50 hrs
Every
500 hrs
Every
1500 hrs
Every
3000 hrs
Oil Level/Quality X
Oil Leaks X
Water Leaks X
Belts, Pulley X
Plumbing X
Recommended Spare Parts
Oil Change p/n 01154 X X
Plunger Packing Kit (1 kit/pump)
(see page 8 for kit list)
X
Oil Seal Kit (1 kit/pump)
(see page 8 for kit list)
X
Valve Spare Parts (1 kit/pump)
(see page 8 for kit list)
X
5
5
5
ContactGiantIndustriesforserviceschoolinformation.Phone:(419)531-4600

GIANT INDUSTRIES, INC., 900 N. Westwood Ave., Toledo, Ohio 43607
PHONE [phone], FAX [phone], www.giantpumps.com
© Copyright 2022 Giant Industries, Inc.
03/22 P426HHP.indd
Dimensions - P426HHP - 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