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5.  Crankshaft rotation on Giant Industries, 

Inc. pumps should be made in the direction 

designated by the arrows on the pump crank-

case. 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 ob-

tained from the charts on pages 4 and 5. 

Dur-

ing operation, all rotating parts, shaft(s) and 

coupling, must be covered with a protective 

guard. Plunger area must have the cover plate 

(30) secured in place. Do not step on or place 

weight on the plate (30).

6.  Before beginning operation of your pump

-

ing system, remember: Check that the crank

-

case 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.

IMPORTANT:  

The service life of the seals is 

maximized if a small amount of leakage occurs 

(a few drops per minute from each plunger). 

Leakage must be checked every day. If leak

-

age becomes a constant dripping, the plunger 

seals must be changed.

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. 

2

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 instal-

lation. 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 inclina

-

tion to ensure optimum lubrication. 

IMPORTANT : 

If mounted on a vehicle with 

the possibility of unlevelness and/or the pump 

speed is betwen 300 and 500 RPM, the volume 

of oil should be 1.9 Gal.(7.3 liters). To check, 

put the oil dipstick in the bore situated next to 

the eye bolt (31).

2.  The inlet to the pump should be sized for the 

flow rate of the pump with no unnecessary re

-

strictions 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

o

 

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, con

-

nections, 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 pulsa

-

tion.  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.

INSTALLATION INSTRUCTIONS

NOTE:  Contact Giant Industries for Service School Information.  Phone:  (419)-531-4600.

Summary of Contents for GP7145

Page 1: ...ns GP7255A page 5 Exploded View page 6 Parts List page 7 Kits Torque Specifications page 8 Repair Instructions page 9 Troubleshooting Guide page 10 Dimensions page 11 Warranty Information back page Tr...

Page 2: ...ion is to be considered as a general outline for instal lation If you have unique requirements please contact Giant Industries Inc or your local distributor for assistance 1 The pump should be install...

Page 3: ...ged if condensate or frothy oil occurs in crankcase 2 Pump operation must not exceed rated pressure volume or RPM A pres sure relief device must be installed in the discharge of the system 3 Acids alk...

Page 4: ...inuous 750 RPM Speed Intermittent 947 RPM Inlet Pressure maximum 145 PSI 10 bar Plunger Diameter 1 77 45mm Plunger Stroke 2 0 52mm Crankshaft Diameter 1 9 48mm Key Width 0 6 14mm Crankshaft Mounting E...

Page 5: ...Speed Continuous 700 RPM Speed Intermittent 851 RPM Inlet Pressure maximum 145 PSI 10 bar Plunger Diameter 2 17 55mm Plunger Stroke 2 0 52mm Crankshaft Diameter 1 9 48mm Key Width 0 6 14mm Crankshaft...

Page 6: ...6 Exploded View GP7145 SSP and GP7255A SSP...

Page 7: ...38A 13156 O Ring for 38 3 38B 06258 O Ring for 38 GP7145 SSP 3 PARTS LIST GP7145 SSP and GP7255A SSP 7 ITEM PART DESCRIPTION QTY 38B 07721 O Ring for 38 GP7255A SSP 3 39 06171 Seal Sleeve GP7145 SSP 3...

Page 8: ...Radial Shaft Seal Loctite 403 36A 07667 Plunger Connection 33 ft lbs 45 Nm 36C 07664 Tension Screw Loctite 243 30 ft lbs 40 Nm 49 13159 Stud Bolt Loctite 270 49A 13160 Hexagon Nut 103 ft lbs 140 Nm 5...

Page 9: ...ge becomes too heavy and causes output and operating pressure to drop MOUNTING VALVE CASING Check O rings 38A 38B on the seal case 38 Clean surfaces of seal sleeves in gear box and sealing surfaces of...

Page 10: ...Check inlet lines for restrictions and or proper sizing Rough Pulsating Operation with Pressure Drop Worn packing Replace packing Inlet restriction Check system for stoppage air leaks correctly sized...

Page 11: ...GP7145 SSP and GP7255A SSP Dimensions Inches mm 11 NPT NPT...

Page 12: ...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...

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