Giant P300 Series User manual

Triplex Ceramic
Plunger Pump
Operating Instructions/
Repair and Service Manual
Contents:
Installation Instructions: page 2
Pump Specications: page 3
Exploded View: page 4
Parts List: page 5
Kits/Torque Specications: page 6
Pump Mounting Selection Guide: page 6
Trouble Shooting: page 7
Recommended Spare Parts List: page 7
Repair Instructions: pages 8-10
Dimensions: page 11
Warranty Info: back page
Updated 06/22
For Models:P316, P317, P319, P322, P323, P325, P328, P329, P332 & P340
P300 Series -
16 & 18 mm versions

2
INSTALLATION INSTRUCTIONS
recommended by Giant Industries, Inc. to further re-
duce system pulsation. Dampeners can also reduce
the severity of pressure spikes that occur in systems
using a shut-o󰀨 gun. A dampener must be positioned
downstream from the unloader.
5. When viewed from the side of the pump, crank-
shaft rotation is clockwise on pumps with left handed
shafts and counterclockwise on pumps with right
handed shafts. Reverse rotation may be safely
achieved by removing 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 instruc-
tions as necessary for the proper assembly se-
quence. Required horsepower for system operation
can be obtained from the date located on page 3.
6. Before beginning operation of your pumping
system, remember: Check that the crankcase and
seal areas have been properly lubricated per rec-
ommended 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 ow freely to the inlet of the pump.
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 dis-
charge port can also be used and the pump run “dry”
for 1-2 minutes for this purpose.
1. Prior to initial operation, add oil to the crankcase so that oil level is between the two lines on the oil dip-
stick. DO NOT OVERFILL.
Use Giant oil - P/N 01153 (20W-50 non-detergent motor oil)
Crankcase oil should be changed after the rst 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. A pressure relief device must be in-
stalled in the discharge of the system.
3. Acids, alkalines, or abrasive uids cannot be pumped unless approval in writing is obtained before opera-
tion from Giant Industries, Inc.
4. Run the pump dry approximately 10 seconds to drain the water before exposure to freezing temperatures.
Installation of the Giant Industries, Inc., pump is
not a complicated procedure, but there are some
basic steps common to all pumps. The follow-
ing information is to be considered as a general
outline for installation. If you have unique re-
quirements, please contact Giant Industries, Inc.
or your local distributor for assistance.
1. The pump should be installed at 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 ow
rate of the pump with no unnecessary restrictions
that can cause cavitation. Teon tape should be
used to seal all joints. If pumps are to be operated
at temperatures in excess of 1600F, it is important to
insure a positive head to the pump to prevent cavita-
tion.
*Make sure that suction pulsation is su󰀩ciently
dampened - water column resonance mus be
avoided.
3. The discharge plumbing from the pump should be
properly sized to the ow rate to prevent line pres-
sure 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-o󰀨 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
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.
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 on the next page.

3
Horsepower Ratings:
We recommend a 1.15 service factor be specied when selecting an electric motor as the power source.
To compute electric motor horsepower required, use the following formula: HP = (GPM X PSI) / 1450.
The formula to determine the horsepower required for a gas engine is: HP = (GPM X PSI) / 1150.
The formula to determine the horsepower required for a diesel engine is: HP = (GPM X PSI) / 1250.
For the Application of a Hydraulic Motor:
To Determine the Torque of a Hydraulic Motor -- (GPM x PSI x 36.77) / RPM = Torque (in-lbs)
Calculating RPM / GPM of Pump:
A pump must be connected to an electric motor or gas or diesel engine with the correct ratio of pulleys
and belts to attain the required speed and GPM. The use of a Variable Frequency Drive (VFD) may also
be used to control the RPM of a properly sized electric motor when variable ows are required.
(Max. Pump RPM / Rated Pump GPM) x Required Pump GPM = Required Pump RPM
To calculate a pulley diameter one (1) pulley diameter and the required pump RPM must be known:
(Pump RPM x Pump Pulley Diameter) / Motor RPM = Motor Pulley Diameter
(Motor RPM x Motor Pulley Diameter) / Pump RPM = Pump Pulley Diameter
Common Specications:
Inlet Pressure ......................145 PSI (10 Bar)*
Crankshaft Diameter............0.94” (24mm)
Max. Temperature................160° F (70° C)
Oil Capacity (short)..............14.2 . oz. (0.42 L)
Oil Capacity (extended).......17.0 . oz. (0.5 L)
Inlet Ports ............................(2) 1/2” BSP
Discharge Ports...................(2) 3/8” BSP
Weight .................................16 lbs (7.3 kg)
Shaft Rotation.......................Top of Pulley Towards
Fluid End
Materials Used for P300 Pumps:
Manifold ........ Forged Brass
Plungers ....... Solid Ceramic Oxide
Valves ............. High Grade Stainless Steel
Seals............... Nitrile with Fabric Reinforcing
Gear End ........ Aluminum Die-Cast
Pump Specications
Max.
Flow
Max.
Flow
Nominal/In-
termittent
Pressure
Nominal/
Intermittent
Pressure
Max.
Speed
Power
Req’d
Power
Req’d
Plunger
Diameter
Plunger
Diameter
Stroke Stroke NPSH
Req’d
NPSH
Req’d
Model GPM l/min PSI bar RPM BHP kW in mm in mm Ft.-Head mWs
P317 3.5 13.2 3045/3350 210/230 1750 7.4/8.1 5.5/6.0 0.71 18 0.42 10.6 26.2 8.0
P323 3.5 13.2 3685 255 1750 8.9 6.6 0.71 18 0.42 10.6 26.2 8.0
P340 3.7 14.1 3500/4000 240/280 1750 8.9/10.2 6.6/7.6 0.63 16 0.56 14.1 N/A N/A
P316 4.0 15.1 3045/3350 210/230 1450 8.4/9.2 6.3/6.9 0.71 18 0.56 14.1 19 5.8
P322 4.0 15.1 3500 240 1450 9.7 7.2 0.71 18 0.56 14.1 19 5.8
P328 4.1 15.5 3200/3500 220/240 3450 9.0/9.9 6.7/7.4 0.63 16 0.31 8.0 N/A N/A
P329 4.1 15.5 3500/4000 240/275 3450 9.9/11.3 7.4/8.4 0.63 16 0.31 8.0 N/A N/A
P316 4.7 17.8 2500/2750 170/190 1750 8.1/8.9 6.0/6.6 0.71 18 0.56 14.1 19 5.8
P322 4.7 17.8 3000 200 1750 9.7 7.2 0.71 18 0.56 14.1 26.2 8.0
P319 4.8 18.2 2500/2750 170/190 3450 8.3/9.1 6.2/6.8 0.71 18 0.31 8.0 N/A N/A
P332 4.8 18.2 3000 200 1450 9.9 7.4 0.71 18 0.63 16 31.2 9.5
P325 4.8 18.2 3045 210 3450 10.1 7.5 0.71 18 0.31 8.0 N/A N/A
White= US measurements
Grey= Metric measurements
*See note page 2

4
Exploded View - P300 Series - 16 and 18mm

5
P300 SERIES PARTS LIST
ITEM PART # DESCRIPTION QTY.
1 08326 Crankcase 1
2 06773 Dipstick Assembly 1
3 08410B Crankcase Cover, Short 1
3 08410-LG Crankcase Cover, Extended 1
3A 07190 Oil Drain Plug 1
3B 13262A Gasket for Plug 1
4 08328 O-Ring 1
5 06273 Oil Drain Plug 1
5A 08192 Gasket 1
6 07188 Screw, Short Cover 4
6A 01176-2 Spring Washer 12
6B 01196 Screw, Long Cover 4
7 08303 Bearing Cover I 2
8 08491 Sight Glass 1
9 07193 O-Ring 1
10 07225 Screw with Lock Washer 8
11 08331 Radial Shaft Seal 1
12 01086 Ball Bearing (A,D,F,H) 2
12 01086A Ball Bearing (B,C,E,G,I,J) 1
12A 07760 Roller Bearing (B,C,E,G,I,J) 1
13 08478 Crankshaft (A,B) 1
13 08332 Crankshaft (C,D,E,) 1
13 06508 Crankshaft (F,G,H,I) 1
13 08340 Crankshaft (J) 1
14 06207 Straight Key 1
15 08333 Connecting Rod 3
16 08453 Plunger Assembly Complete,
18mm (A,B,D,E,F,G,J) 3
16 06540 Plunger Assembly, Complete,
16mm (C,H,I) 3
16A 08367 Plunger Base 3
16B 08455 Plunger Pipe (A,B,D,E,F,G,J) 3
16B 06541 Plunger Pipe (C,H,I) 3
16C 08456 Tension Screw 3
16D 07676 Copper Washer 3
ITEM PART # DESCRIPTION QTY.
17 06542 Wrist Pin 3
17A 22723 Clip Ring 6
18 07770 O-Ring 3
19 08356 Oil Seal 3
20 08458 Seal Case (A,B,D,E,F,G,J) 3
20 06543 Seal Case (C,H,I) 3
21 07780 O-Ring 3
22 12027 O-Ring 3
23 08477 V-Sleeve (A,B,D,E,F,G,J) 3
23 07767 Grooved Seal (C,H,I) 3
23A 08087 Grooved Seal (A,B,D,E,F,G,J) 3
23A 06315 Grooved Seal (C,H,I) 3
24 07904 Pressure Ring (A,B,D,E,F,G,J) 6
24 07768 Pressure Ring (C,H,I) 3
25 08337 Weep Return Ring
(A,B,D,E,F,G) 3
25 06544 Weep Return Ring (C,H,I) 3
26 06349* Valve Casing (A,B,D,E,F,G,J) 1
26 06545 Valve Casing (C,H,I) 1
27 07849 Valve Seat 6
28 07491 Valve Plate 6
29 07906 Valve Spring 6
30 07907 Valve Spring Retainer 6
31 07853 O-Ring 6
32 06350* Valve Plug (A,B,D,E,F,G,J) 6
32 06546 Valve Plug (C,H,I) 6
32X 07946A Valve Assembly, Complete 6
33 07913 O-Ring 6
34 08363 Hex Head Cap Screw 6
36 13338 Plug, 3/8” BSP 1
36A 08486 Copper Crush Washer, 3/8” 1
37 07109 Plug, 1/2” BSP 1
37A 07661 Seal 1
*For P316/P317 pumps manufactured prior to 5/98, Item
26=08459 & Item 32=07928
A= P317 B= P323 C= P340 D= P316 E= P322 F= P319 G= P325 H= P328 I= P329 J=P332

6
Position Item# Description Torque Amount
3A 07190 Oil Drain Plug w/ Gasket 266 in.-lbs. (30 Nm)
5 06273 Oil Dran Plug 266 in.-lbs. (30 Nm)
6/6B 07188/1196 Screw 88 in.-lbs (10 Nm)
10 07225 Screw with Lock Washer 88 in.-lbs. (10 Nm)
16C 08456 Tension Screw, Plunger 221 in.-lbs. (25 Nm)
32 06350/06546 Plug 55 ft.-lbs. (80 Nm)
34 08363 Hex Head Cap Screw, Valve Casing 221 in.-lbs.(25 Nm)
P300 SERIES REPAIR KITS
Plunger Packing Kits
P316/P317/P319/P322/
P323/P325/P332 - # 09119
Item Part # Description Qty.
23 08477 Grooved Seal, Black 3
23A 08087 Grooved Seal, Brown 3
24 07904 Pressure Ring, 18mm 6
P328/P329/P340 - # 09507
Item Part # Description Qty.
23 07767 Grooved Seal, 16mm 3
23A 06315 Grooved Seal,16mm 3
24 07768 Pressure Ring 3
Valve Assembly Kit - # 09116
Item Part # Description Qty.
31 07853 O-Ring 6
32X 07946A Valve Assembly 6
33 07913 O-Ring 6
Oil Seal Kit - # 09144
Item Part # Description Qty.
19 08356 Oil Seal 3
Pump Mounting Selection Guide
Bushings
01074 - 24 mm Tapered H Bushing
Pulley & Sheaves
01061 - 7.75” Cast Iron 1 gr. - AB Section
01062 - 7.75” Cast Iron - 2 gr. - AB Section
Rails
01160 Plated Steel Channel Rails
(L=5.75”X W=1.0” x H+1.812”)
01161 Plated Steel Channel Rails
(L+5.75”x W+1.00”x H=2.50”)
01163 Retro-Fit Rail
(L=12” x W=1.5” x H=3”)
Optional Viton Seal Kits
P316/P317/P319/P322/P323/P325 - # 09456
Item Part # Description Qty.
18 07770-0001 O-Ring, Viton 3
21 07780-0001 O-Ring, Viton 3
22 12027-0001 O-Ring, Viton 3
23/23A 07902-0010 V-Sleeve, Viton 6
24 07904 Pressure Ring 6
31 07853-0001 O-Ring, Viton 6
33 07913-0001 O-Ring, Viton 6
Optional High-Temp Seal Kits
P316/P317/P319/P322/P323/P325 - # 09599
Item Part # Description Qty.
23/23A 08477-0030 High-Temp Seals 6
24 07904 Pressure Ring 6
Torque Specications

7
Check Daily Weekly 50 Hrs.
Every 500
Hours
Every 1500
Hours
Every 3000
Hours
Oil Level/Quality X
Oil Leaks X
Water Leaks X
Belts, Pulley X
Plumbing X
Oil Change p/n 01153 X X
Plunger Seal Kit (1 kit/pump) X
Oil Seal Kit (1 kit/pump) X
Valve Repair Kit (1 kit/pump) X
Preventative Maintenance Check List & Recommended Spare Parts List
Recommended Spare Parts
TROUBLESHOOTING GUIDE
MALFUNCTION CAUSE REMEDY
The Pressure and/ Worn packing seals Replace packing seals
or the Delivery Broken valve spring Replace spring
Drops Belt slippage Tighten or Replace belt
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

8
REPAIR INSTRUCTIONS - P300 SERIES - 16 & 18 MM VERSIONS
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.
1.With a 24mm socket wrench,
remove the (3) discharge
valve plugs and (3) inlet
valve plugs (#32). Inspect
the o-ring (#33) for wear and
replace if damaged.
2. Using a needle nose
pliers, remove the inlet and
discharge valve assemblies
(#32X).
3. The valve assemblies can
be separated by inserting a
small screw driver between
the valve seat (#27) and its
valve spring retainer (#30).
4. Remove each o-ring (#31).
Inspect all parts for wear
and replace as necessary.
Reassemble valve assy’s
(32X) & place in valve casing
(26)
5. Apply one drop of Loctite 243
to valve plugs (32) and tighten
to 55 ft.-lbs. (75 Nm). For
pumps manufactured prior to
5/97 tighten plugs to 37 ft-lbs.
(50 Nm).
6. Next, use a 6mm allen
wrench to remove the 6 hex
head cap screws (#34).
7. Carefully slide the valve
casing (#26) out over the
plungers with a screwdriver
placed between the valve
casing and crankcase.
8. Remove weep return rings
(#25) from the plungers (#16).
Remove the seal case (#20)
from either crankcases (#1)
or manifold (#26) by using a
screwdriver as shown above.
NOTE: If there are deposits of
any kind (i.e., lime deposits) in
the valve casing, be certain the
weep holes in the weep return
ring (#25) and valve casing
(#26) have not been plugged.

9
11. Inspect o-rings (#21
and 22) and replace as
necessary.
9. Remove the pressure
rings (#24) and grooved
seals (#23) from the valve
casing (#26). Inspect parts
for wear and replace if
necessary.
10. Remove the weep grooved
seals (23A) from the seal
case (#20). Remove the
pressure rings (#24).
12. Use a at screw driver
to pry the oil seals (#19)
loose from the seal case
(#20).
REPAIR INSTRUCTIONS - P300 SERIES - 16 & 18 MM VERSIONS
13. Check surfaces of the
plunger bases and plunger
pipes (#16B). A damaged
surface will cause
accelerated wear on the
seals. Deposits of any kind
must be carefully removed
from the plunger surface.
A damaged plunger must
be replaced!

10
Reassembly sequence of the P300 Series pump
REPAIR INSTRUCTIONS - P300 SERIES - 16 & 18 MM VERSIONS
14. If the oil seals (#19) were
removed, replace them
with the primary seal lip
(grooved side) towards the
crankcase and the dust
lip (tapered end) towards
the valve casing (#26).
Lubricate the seal before
replacing. Install the oil
scraper (#18) over the
plunger.
15. Place each seal case
(#20) with o-rings (#21, 22)
over the plungers (#16).
Be certain the oil seal is
centered with the seal case
and tap rmly until the seal
case is seated squarely on
the crankcase (#1). Place
pressure ring (#24) in seal
case).
16. With the grooved side
pointed toward the valve
casing, place the weep
grooved seals (23A) over
each plunger and into each
seal case (#20).
17. Generously lubricate the grooved seals (#23) and assemble these
items into the valve casing. Place the weep return rings (#25)
onto each plunger (#16). Place the pressure rings (#24) over the
plungers. Slide the valve casing over the plungers and seat rmly.
Replace the 6 hex head cap screws (#34) and tighten to 221 in.-
lbs. (25 Nm) in a crossing pattern.
Contact Giant Industries or you local
distributor for maintenance of the gear
end of your pump. Phone: [phone]

11
P300 SERIES DIMENSIONS - INCHES (mm)

GIANT INDUSTRIES, INC., 900 N. Westwood Ave., Toledo, Ohio 43607
PHONE [phone], FAX [phone], www.giantpumps.com
Copyright 2022 Giant Industries, Inc. 06/22 P300-16_18mm.indd
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 [phone] 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