Triplex Ceramic
Plunger Pump
Operating Instructions/
Repair and Service
Manual
Models
LP122A Series/LP123/LP255
For Models:
LP122A
LP122A-3100
LP122A-4000
LP123
LP255
Updated 5/01
Contents:
Installation Instructions: page 2
Pump Specifications: page 3-4
Exploded View: page 5
Parts List: page 6
Kit List/Torque
Specifications: page 7
Repair Instructions: pages 8-10
Dimensions: page 11
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 160
F, it is important to insure a positive head to the pump to
prevent cavitation. See NPSH curve.
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
0
request from Giant Industries, Inc. Required horsepower
for system operation can be obtained from the charts on
pages 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 the crankcase so that
oil level is between the two lines on the oil dipstick. DO
NOT OVERFILL.
Use SAE 90 Industrial gear oil
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.
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 device must be installed in the
NOTE: Contact Giant Industries for Service School Information. Phone: (419)-531-4600
2
Specifications
Models LP122A Series/LP123
Volume............................................................................................... Up to 39.0 GPM (147.6 l/m)
Discharge Pressure ............................................................................ Up to 2000* PSI (138* Bar)
Inlet Pressure ..................................................................................... Up to 90 PSI (6.2 Bar)
Speed ................................................................................................. Up to 885 RPM
Plunger Diameter ............................................................................... 42 mm
Stroke ................................................................................................. 42 mm
Crankcase Oil Capacity ..................................................................... 116 fl.oz.
Temperature of Pumped Fluids ......................................................... Up to 160
Inlet Port ............................................................................................ 1-1/2" NPT
Discharge Port ................................................................................... 1" NPT
Crankshaft Mounting ......................................................................... Either Side
Shaft Rotation .................................................................................... Top of Pulley Towards Fluid End
Weight................................................................................................ 116 lbs.
Crankshaft Diameter.......................................................................... 35 mm
Valve Casing - LP122A ..................................................................... Aluminum Bronze
Valve Casing - LP123 ........................................................................ Brass
Valve Casing - LP122A-4000 ............................................................ 303 S.S.
Valve Casing - LP122A-3100 ............................................................ Aluminum Bronze-Nickle
Volumetric Efficiency @ 800 RPM................................................... 0.96
Mechanical Efficiency @ 800 RPM.................................................. 0.85
o
F (71oC)
PULLEY INFORMATION
Pulley selection and pump speed are based on a 1725
RPM motor and "B" section belts. When selecting
desired GPM, allow for a ±5% tolerance on pumps
output due to variations in pulleys, belts and motors
We recommend that a 1.1 service factor be specified
when s electing an electric motor as the power source.
To compute specific pump horsepower requirements,
use the following formula:
HORSEPOWER INFORMA TION
among manufacturers.
1. Select GPM required, then select appropriate
HP = (GPM X PSI) / 1440
motor and pump pulley from the same line.
2. The desired pressure is achieved by selecting the
correct nozzle size that corresponds with the pump
GPM.
Pump speeds of 640 RPM and above require a minimum inlet pressure of 12 psig.
Pump speeds of 805 RPM and above require a minimum inlet pressure of 14 psig.
LP122A SERIES/LP1 23 PULLEY SELECTION AND HORSEPOWER
REQUIREMENTS
GPM
22.3 12.75" 3.95" 500 9.6 12.7 15.9 20.7 31.9
24.7 12.75" 4.35" 555 10.6 14.1 17.6 22.9 35.3
28.5 12.75" 4.95" 640 12.2 16.3 20.4 26.5 40.7
30.9 12.75" 5.35" 695 13.2 17.7 22.1 28.7 44.1
33.4 12.75" 5.75" 750 14.3 19.1 23.9 31.0 47.7
35.6 12.75" 6.15" 800 15.3 20.3 25.4 33.1 50.9
39.4 12.75" 6.50" 885 16.9 22.5 28.1 36.6 56.3
PUMP
PULLEY
*
MOTOR
PULLEY
RPM 600 PSI 800 PSI 1000 PSI 1300 PSI 2000 PSI*
*Intermittent duty only! - Consult factory!
3
Specifications
Model LP255
Volume............................................................................................... Up to 26.0 GPM (147.6 l/m)
Discharge Pressure ............................................................................ Up to 2200*
Inlet Pressure ..................................................................................... Up to 90 PSI
Speed ................................................................................................. Up to 1000 RPM
Plunger Diameter ............................................................................... 32 mm
Stroke ................................................................................................. 42 mm
Crankcase Oil Capacity ..................................................................... 116 fl.oz.
Temperature of Pumped Fluids ......................................................... Up to 160
Inlet Port ............................................................................................ 1-1/2" NPT
Discharge Port ................................................................................... 1" NPT
Crankshaft Mounting ......................................................................... Either Side
Shaft Rotation .................................................................................... Top of Pulley Towards Fluid End
Weight................................................................................................ 116 lbs.
Crankshaft Diameter.......................................................................... 35 mm
Valve Casing - LP122A ..................................................................... Aluminum Bronze
Valve Casing - LP123/LP255 ............................................................ Brass
Valve Casing - LP122A-4000 ............................................................ 303 S.S.
Valve Casing - LP122A-3100 ............................................................ Aluminum Bronze-Nickle
Volumetric Efficiency @ 800 RPM................................................... 0.96
Mechanical Efficiency @ 800 RPM.................................................. 0.85
o
F
PULLEY INFORMATION
Pulley selection and pump speed are based on a 1725
RPM motor and "B" section belts. When selecting
desired GPM, allow for a ±5% tolerance on pumps
output due to variations in pulleys, belts and motors
We recommend that a 1.1 service factor be specified
when s electing an electric motor as the power source.
To compute specific pump horsepower requirements,
use the following formula:
HORSEPOWER INFORMA TION
among manufacturers.
1. Select GPM required, then select appropriate
HP = (GPM X PSI) / 1440
motor and pump pulley from the same line.
2. The desired pressure is achieved by selecting the
correct nozzle size that corresponds with the pump
GPM.
LP255 PULLEY SELECTION AND HORSEPOWER REQUIREMENTS
PUMP
PULLEY
12.75" 3.95" 500 13 9.3 13.9 18.6 20.4
12.75" 4.35" 640 16.6 11.9 17.8 23.7 26.1
12.75" 4.95" 750 19.5 13.9 20.9 27.9 30.6
12.75" 5.35" 805 20.9 14.9 22.4 29.9 32.8
12.75" 5.75" 865 22.5 16.1 24.1 32.1 35.4
12.75" 6.15" 920 23.9 17.1 25.6 34.1 37.6
12.75" 6.50" 1000 26 18.6 27.9 37.1 40.9
MOTOR
PULLEY
RPM GPM 1000 P SI 1500 PSI 2000 PSI 2200 PSI
*Intermittent duty only! - Consult factory!
4
Exploded View - LP122A Series/LP123/LP255
5
LP122A SERIES/LP123/LP255 PARTS LIST
A = LP122A B = LP123 C = LP122-4000 D = LP122A-3100 E = LP255
ITEM PART NO. DESCRIPTION QTY.
1 07759 Crankcase 1
2 13000 Oil Filler Plug 1
4 06085 Crankcase Cover 1
5 07104 O-Ring 1
6 07186 Oil Sight Glass W/Gasket 1
8 06086 Oil Dipstick 1
9 01009 O-Ring 1
10 01010 Screw, (A, B, C, E) 4
10 08093 Screw, (D) 4
11 01011 Spring Washer, (A, B, C) 5
11 08094 Spring Washer, (D) 5
12 07109 Oil Drain Plug, (A, B, C, E) 1
12 12137 Oil Drain Plug, (D) 1
13 07110 Gasket, (A, C) 1
13 07182 Gasket, (B, D, E) 1
14 07111 Bearing Cover 2
15 07112 Crankshaft Seal 2
16 07113 O-Ring 2
17 07114 Hex Screw, (A, B, C, E) 8
17 08095 HexScrew, (D) 8
20 07116 Taper Roller Bearing 2
20A 07117 Fitting Disc, 0.1mm 2
20B 13001 Fitting Disc, 0.15mm 3
21 07118 Shaft Protector 1
22 13242 Crankshaft 1
23 13243 Key 1
24 13340 Connecting Rod Assy. 3
24A 13277 Hex Screw 6
24B 13278 Spring Washer 6
25 13341 Crosshead Plunger
Base Assy. 3
28 13232 Crosshead Pin 3
29A 07735 Centering Sleeve 3
29B 07736 Plunger Pipe (A-D) 3
29B 13022 Plunger Pipe (E) 3
29C 07737 Plunger Bolt, (A, B, C, E) 3
29C 07737-0100 Plunger Bolt, (D) 3
29D 07755 Copper Gasket, (A, B, C, E) 3
29D 07761-0100 Gasket for Bolt, (D) 3
29E 06087 Spacer Pipe, (A, B, C, E) 3
29E 06618 Spacer Pipe, (D) 3
30 07789 Flinger (A, B, C, D) 3
30 07779 Flinger (E) 3
31 06120 Seal Retainer, Complete, (A, C) 3
31A 06118 Oil Seal, (A, C) 3
31B 07133 Radial Shaft Seal, (B, D, E) 3
32 06116 Oil Seal Retainer, (A, C) 3
32A 06119 O-Ring, (A, C) 3
33 06117 Backup Seal, (A, C) 3
35 13342 Seal Sleeve, (A, B, C) 3
35 13342-0100 Seal Sleeve, (D) 3
35 06699 Seal Sleeve (E) 3
35A 07740 O-Ring, (A, B, C, E) 3
35A 06619 O-Ring, (D) 3
ITEM PART NO. DESCRIPTION QTY.
35B 13141 O-Ring (E only) 3
36 13415 V-Sleeve, Weep (A-D) 3
36 13025 V-Sleeve, Weep (E) 3
36A 13416 Pressure Ring, Weep, (A, B, C) 3
36A 13416-0100 Pressure Ring, (D) 3
36A 06700 Pressure Ring (E) 3
37 06701 Support Disc (E only) 3
39 07744 Pressure Ring, (A, B, C) 3
39 07744-0100 Pressure Ring, (D) 3
39 13026 Pressure Ring (E) 6
40 07745 V-Sleeve (A, B, C, D) 6
40 13027 V-Sleeve (E) 6
41 07746 Support Ring, (A, B, C) 3
41 06621-0100 Support Ring, (D) 3
41 06702 Support Ring (E) 3
42 06589 Plug, (D only) 3
42A 07204-0100 Steel Ring, (D only) 3
43 13343 Valve Casing, (A) 1
43 06625 Valve Casing, (B) 1
43 13343-4000 Valve Casing, (C) 1
43 13343-3000 Valve Casing, (D) 1
43 06703 Valve Casing, (E) 1
44 07748 Valve Seat, (A, B, C, E) 6
44 07748-0100 Valve Seat, (D) 6
44A 07150 O-Ring, (A, B, C, E) 6
44A 06620 O-Ring, (D) 6
45 07749 Valve Plate, (A, B, C, E) 6
45 07749-0100 Valve Plate, (D) 6
46 07750 Valve Spring 6
46A 07751 Valve Assy. Complete, (A, B, C, E)
(#44, 44A, 45, 46, & 47) 6
46A 07751-0100 Valve Assmebly Complete (D)
(#44, 44A, 45, 46, & 47) 6
47 07752 Spring Retainer 6
48 07753 Plug, (A) 6
48 06504 Plug, (B, E) 6
48 06089 Plug, (C, D) 6
48A 12055 O-Ring, (A, B, C, E) 6
48A 06577 O-Ring, (D) 6
49 07157 Stud Bolt 8
49A 07158 Nut 8
49B 07159 Washer 8
50 07423 Plug, (A,B, E) 1
50 07423-0100 Plug, (C, D) 1
50A 07161 Gasket, (A, B,C, E) 1
50A 07755-0100 Gasket, (D) 1
52 13020 Disk for Crankshaft 1
53 06607 Hexagon Screw 1
54 07756 Plug 1" NPT, (A, C) 1
54 06626 Plug 1" NPT, (B, E) 1
54 13321-0100 Plug 1" BSP, (D) 1
55 07757 Plug 1-1/2" NPT, (A, C) 1
55 06627 Plug, 1-1/4" NPT, (B, E) 1
55 13322-0100 Plug, 1" BSP, (D) 1
NOTE: For LP122 pumps manufactured prior to 5/94, and needing weep seal replacement, change the pressure ring
(36) to the newer style (p/n 13416) and use the new style weep seal (p/n 13415) in your pumps.
6
LP122A SERIES/LP123/LP255 PUMP REPAIR KITS
Plunger Packing Kit
# 09477 (LP122A, LP123, LP122A-4000)
(for pumps manufatured after 4/98)
Item Part # Description Qty.
35A 07740 O-ring 3
36 13415 V- Sle eve , W eep 3
40 07745 V-Sleeve 6
Plunger Packing Kit
# 09535 (LP255)
Item Part # Description Qty.
35A 07740 O-ring 3
35B 13141 O-Ring 3
36 13025 V-Sleeve weep 3
40 13027 V-Sleeve 6
Valve Assembly Kit
LP122A. LP123, LP122A-4000, LP255
#09136
Item Part # Description Qty.
46A 07751 Valve Assembly, Complete 3
48A 12055 O-Ring 3
Valve Assembly Kit
LP122A-3100
#09305
Item Part # Description Qty.
46A 07751-0100 Valve Assembly Complete 3
48A 06577 O-Ring 3
LP122A SERIES/LP123/LP255 TORQUE SPECIFICATIONS
Position Item# Description Torque Amount
10 01010/08093 Screw, Cover 125 in.-lbs.
17 07114/08095 Hex Screw, Bearing Cover 125 in.-lbs.
24A 13277 Hex Screw, Connecting Rod 250 in.-lbs.
29C 07737/07737-0100 Plunger Bolt 26 ft.-lbs.
48 07753/06504/06089 Plug, Valve 160 ft.-lbs.
49A 07158 Nut, Stud Bolt 60 ft.-lbs.
7
LP122A Series/LP123 - Repair Instructions
44A 44 45 48 47
1. With a 30mm wrench, remove the six (6) plugs (48)
from the valve casing (43).
Inspect the o-rings (48A)
and replace if necessary.
Remove the complete valve
assembly (46A) by threading a 12mm bolt into the
spring retainer and pulling
straight out.
3. Remove the eight (8) hex
nuts (49A) with a 19mm
wrench. Tap the back of
the manifold (43) with a
rubber mallet to dislodge
and slide off the studs.
2. To disassemble the valve, screw the bolt into the retainer until
the valve plate (45) presses the valve seat (44) out of the spring
retainer. Examine all parts and replace if necessary. If the seat
doesn’t come out, use a valve puller to remove.
36A 36 35 35A 35B 39 40 40 41 37
(LP255 only) (LP255 only)
4. Remove the seal sleeve (35) from the manifold and/or crankcase. Remove the pressure rings (39&36A), v-sleeves (40&36),
support ring (41) and o-rings (35A and 35B in Lp255A only)
from the manifold and seal sleeve, respectively. For LP255
only, remove support ring (37). Examine seals carefully and
replace if worn. Clean all parts.
5. If there are signs of oil
leaking through the
plunger oil seals, then
replacment is
neccessary.For
LP122A &
LP122A-4000, remove
the plunger pipe (29B)
before inspecting oil
seals (31A & 33).
For the LP123 &
LP122A-3100
dissassemble the gear
end and push out the
seals from the back of
the pump.
29E 29A 29B 29D 29C
6. Inspect surface of plunger pipe (29B) carefully. Remove any
chemical or mineral deposits taking care not to damage the
surface of the plunger. If plunger pipe is worn, remove the
plunger bolt (29C) , plunger pipe (29B) and spacer (29E).
Replace worn parts necessary. Note:
Always use a new copper
gasket (29) when repairing the plunger assembly.
8
oil.
7. For LP122A & LP122A-4000
pumps, oil seal replacement
can be accomplished by pulling the retainer forward out of
the crankcase. The o-ring
around the outside of the retainer should be replaced and
lubricated with a light film of
8. The back-up seal (33) can be
pried out of the back of the
retainer (32) with a small
screwdriver. To replace with
new seal, lubricate edges of
new seal, then squeeze outside edges of seal, forcing the
seal to collapse into a figure 8.
Tuck the two outside edges of
the figure 8 into the rear of the
retainer, making sure that the
inner lip of the seal faces the
oil. The seal may now be
pressed firmly into place.
TO REASSEMBLE PROCEED AS FOLLOWS:
9. The front oil seal (31A) can
now be removed by inserting a
screwdriver through the rear
of the retainer and tapping the
seal out through the front of
the retainer. Remove any excess old loc-tite from retainer.
To replace oil seal, apply a
light film of loc-tite around
outside edges of seal. Tap seal
firmly into the retainer with a
wooden dowel making certain
that the spring side of the seal
is installed first and that the
seal sits squarely in the retainer.
10. For LP122A & LP122A-4000
pumps, generously lubricate the
inside of the oil seals (31A &
33) and o-ring (32A). Next,
place the seal retainer, complete
(31) over the steel plunger base
seat firmly into the crankcase.
Replace the flinger (30).
29E 29A 29B 29D 29C
11. If previously disassembled thoroughly clean all exposed surfaces on the
spacer (29E) and all exposed threads on the plunger bolt (29C) and the
steel plunger base (25). Threads MUST be free of old loc-tite and any
other material such as oil, grease, etc. This is necessary to ensure proper
curing of new loc-tite. Giant recommends cleaning the threads with
acetone or other suitable cleaner. Reassemble plunger assembly parts
(29A, 29B, & 29E) using a new copper gasket (29D) and the cleaned
plunger bolt (29C). Slide the bolt through the center of the four (4) pieces
so that the threaded end is exposed. Apply several drops of loc-tite 243
(or equivalent) adhesive to the threads. Thread into steel plunger base and
tighten to 26 ft.-lbs. BE CERTAIN ALL PARTS ARE CENTERED
WITH THE BOLT!
9
36A 36 35 35A 35B (LP255 only) 39
12. Lubricate weep seal (36). Place, weep seal (36), and pressure ring (36A)
into the seal sleeve (35). Assemble the o-ring (35A and 35B for LP255
only) onto seal sleeve and lubricate.
14. Press seal sleeve assembly into
the manifold and seat firmly.
Put the support ring (41) on
plunger with v-side facing the
manifold.
15. Place entire manifold/seal
sleeve assembly over the studs
and push firmly until seated
13. For LP255 pumps, insert support ring (37) into valve casing
(43). Place support ring (41) and
v-sleeves (40) into valve
casing.
6
4 2
1 3
8
against the crankcase.
16. Tighten hex nuts (49A) in a
crosswise pattern (shown
above) to 60 ft.-lbs.
48A) and tighten to 160 ft.-lbs.
19. Fill crankcase with approximately 116 fluid ounces of Giant oil or equivalent SAE 90
industrial gear oil and check oil
level of the crankcase with the
dipstick. Proper level is center
of two lines. Reinstall your Giant LP pump into your system.
7
5
firmly into manifold.
17. Next, place valve assemblies
(46A) into manifold after first
lubricating the o-ring (44A). Seat
18. Replace plug with o-ring (48, &
Contact Giant Industries or your local distributor for maintenance
of the gear end of your pump. Phone: 419/531-4600
Contact Giant Industries for service school information. Phone: (419) 531-4600
10
11
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 self-service 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 dateof 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
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 REPRESENTA-
TION, 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
GIANT INDUSTRIES, INC., 900 N. Westwood Avenue, P.O. Box 3187, Toledo, OH 43607
PHONE: (419) 531-4600, FAX: (419) 531-6836, www.giantpumps.com
Ó Copyright 2001 Giant Industries, Inc.
05/01 LP122A/LP123/LP255.PM6
Loading...