GNC P550 Guide

P550 PUMP
Operations and Parts
Manual
GNC Industries, Inc.,
1-870-248-9901
Fax: [phone] Email: [e-mail]
Website: www.gncindustries.com

Page 1
WARRANTY
GNC Industries, Inc. (GNC), P-Series Pumps are warranted for 1 year from
date of purchase or 2 year from manufactured date when properly in-
stalled, maintained and operated. In no event will GNC have a warranty
obligation for normal wear and tear, or for products that have, at GNC's
determination, been subject to accident, abuse, misapplication, improper
installation or improper maintenance. Common examples of normal wear
and tear would include, but not limited to: packings, valves and belts. GNC
limited warranty covers unmistakable defect in material or work-manship.
In this event, GNC will repair or replace, at GNC's option, any part or as-
sembly. Labor is not covered by warranty.
GNC Industries, Inc. makes no warranties, express or implied, other than
those included in this warranty statement, and we disclaim any implied
warrant of merchantability or fitness for any particular purpose. GNC will
not be liable for any consequential, incidental, or indirect damages from
any cause whatsoever.
GNC Industries, Inc. assumes no responsibility for accidents or injuries re-
sulting from maintenance or adjustment of product while product is in op-
eration.
GNC Industries, Inc. has no control over the operational techniques or
chemicals used by consumer. Thus GNC Industries, Inc. assumes no liabil-
ity for the consequences of the use or misuse of any equipment by the
purchaser, their employees or others.
Failure to use properly sized pulleys or operate within recommended speed
and pressure will void warranty. Failure to maintain proper oil levels and
maintenance will void warranty. Modification of equipment will void war-
ranty. Components not manufactured by GNC Industries, Inc will be sub-
ject to the original manufacturers’ warranties.
GNC Industries, Inc. reserves the right to modify or alter materials, dimen-
sions, design, and construction when necessary to improve the perfor-
mance of the pump and/or accessories, or to meet delivery requirements.
GNC is not obligated to provide that change on equipment sold and/or
shipped prior to the product change.

Page 2
• Warning:
1. Never point the spray gun at people or animals.
2. The pump will produce high temperatures when
operating.
3. Keep hands and clothing clear of the belts and
pulleys when operating the pump.
• Before Use/Start Up:
1. Check every fastener, including all hose clamps,
to make sure that the sprayer and the engine are
installed firmly to the frame.
2. Align the pump and engine pulleys in a straight
line and tighten the belts appropriately.
3. Check engine (see engine manual) and pump oil
(non-detergent). Fill as needed to recommended
levels. DO NOT OVER FILL!
4. Check engine fuel. Fill as needed,
with engine manufacture recom-
mended fuel.
5. Attached the spray gun to the spray
hose and tighten all clamps.
6. Set the pump pressure regulator to “Pressure
Release” and make sure the pressure regulator
knob is set to “Start”.
7. Check the on/off switches of engine.
8. Start engine.
9. Set the pump pressure regulator to “Spraying”.
10.Adjust the pressure by turning the adjustable
pressure regulator valve clockwise.

Page 3
• During Use:
1. Make sure the pump has sufficient liquid supply
to allow the pump to reach its working pressure.
2. To prolong the life of the pump, always operate
the machine within its specified pressure limits.
Adjust the pressure by turning the adjustable
regulator knob clockwise.
3. In order to avoid any damage to the packing and
the pump, shut off the engine or motor when
temporarily stopping the unit for more than 5
minutes.
4. Avoid running the pump without liquid.
• After Each Use:
1. Before adding chemical, set the pressure
regulator switch to “Pressure Release”, and run
the pump with clean water to prevent build-up.
2. Set the pressure regulating knob to “START”
when the pump is not in use.
• Maintenance:
1. Change the oil in the pump after the first 10-15
hours of use. After this, change the oil in the
pump after every 70 hours of use. NOTE: Always
make sure the oil is clean and visible thru the oil
sight gauge Ref#11A before operating.
2. Change or replace components, based on the
symptoms as listed in the trouble shooting
section.
• How to Change Oil:
1. Remove Ref # 12A Drain Plug. Allow the oil and
any sludge to drain form the crankcase into an EPA
approved collection device.
2. Replace Ref # 12A Drain Plug once the crankcase
has been drained.

3. Remove Ref # 7A Oil Fill Cap and fill crankcase with
NON Detergent SAE30 oil until the oil level is cover-
ing 2/3 of Ref # 11A Oil Window.
4. Once filled, replaced Ref # 7A Oil Fill Cap.
Page 4
Specifications
Maximum Flow………………………………………………… 15 GPM
Maximum Pressure………………………………………….. 600 PSI
Maximum RPM………………………………………………. 800 RPM
Maximum Temperature………………………………………. 140 F
Inlet Port……………………………………………………………..1¼“
Outlet Port (QTY 2)………………………….…………………….½”
Outlet Port (Regulator Return Line)………………….………¾”
Shaft Size…………………………………………….……………24mm
Dimensions:
Standard Mounted:…………….…18”T x 13”W x 18”L
Weight………………………………………………………….. 60 Lbs
NOTE: Not following proper procedures as listed in the
detailed product manual may void all warranties
Pump Oil
Non-
Detergent
SAE30
Weight

Page 5

Page 6

REF # PART # DESCRIPTION
1A 42-550-01 Crankcase, Set Pins, & Plate
2A 42-550-02 Piston Oil Seal
342-550-03 Dust Cover
542-530-05 Screw
642-530-06 Crankshaft Oil Seal Cover
7A 42-550-07 Oil Inlet Cover Assy.
842-550-08 Rear Cover Packing
942-550-09 Crankshaft Rear Cover
10 42.530.10 Screw
11A 42-530-11 Oil Window Assy.
12A 42-530-12 Drainage Screw Assy.
13 42-530-13 Crankshaft Key
14 42-550-14 Crankshaft
15A 42-550-15 Connecting Rod Assy.
16 42-550-16 Bearing
17 42-550-17 Crankshaft Oil Seal
18 42-530-18 Crankshaft Oil Seal Cover
19A 42-550-19 Piston Assy.
26 42-550-26 Piston Pin
28 42-530-28 Crankcase Stand (Short)
29A 42-530-29 Bolt & Washer
31A 42-550-31 Pulley with Set Bolt
41 42-550-41 Bolt & Washer
42A 42-550-42 Double-End Screw, Nut & Lock Washer
51A 42-550-51 Suction Chamber w/Connector
53A 42-550-53 Bolt & Washer
60A 42-530-60 Connecting Hose w/O-Ring
65 42-550-65 Outlet Chamber
70 FT-F12B ½” Brass Plug
Page 7

REF # PART # DESCRIPTION
75 42-550-75 Air Chamber Surge Tank with O-Ring
74 42-530-74 Air Chamber—O-Ring
75 42-530-75 Air Chamber / Surge Tank
76 FT-GAL-SE14 ¼” Street Elbow
77 FT-TW12B ½” MNPT x ½” HB Swivel
78 FT-3LL34 ¾”x¾” FNPT Fitting
79 FT-3A34 ¾” MNPT x ¾” HB Poly Fitting
200 43-530-200 Complete Regulator
535 43-550-535 Cylinder Head w/ Preinstalled Packing
550 43-550-550 Replacement Valve Kit (6pcs)
NA 43-550-580 Rebuild Kit (ref#s 550 & 525)
NA 43-550-600 Master Rebuild Kit (ref#s 550 & 535)
600 42-950-600 0-600psi Pressure Gauge
Page 8
1-870-248-9901
Fax: [phone]
Email: [email protected]g
For more information and videos visit our
support page:
https://gncindustries.com/support/

Ref: 2, 3, 6, 7, 8, 11, 15,16
Ref: 1,2, 3, 4, 5, 6, 10, 11,
12, 13, 14, 15, 16
Abnormal Vibration
No Liquid at Spray Gun Abnormal Pump Noise
Ref: 2, 11, 14, 15, 16 Ref: 2, 3, 7, 8, 11, 15, 16
Abnormal SuctionLow or Lost Pressure
Ref: 9
Page 9
1. Spray gun tip too large or worn
2. Suction filter clogged
3. Loose suction line connection
4. Malfunctioning pressure gauge
5. Malfunctioning pressure regu-
lator
6. Worn pump suction and dis-
charge valves
7. Over speeding the pump
8. Suction line too small
9. Pulsation dampening chamber
full of water
10. Worn pump valve chamber
11. Foreign object in suction line
12. Plunger packing worn
13. Pump drive belts loose
14. Pressure regulator by-pass
valve open
15. Suction line valve closed
16. Drive pulley spinning on pump
or engine shaft. Replace
drive key.
TROUBLESHOOTING REFERENCE NUMBERS

Page 10
Date Tech DESCRIPTION
Maintenance Log

Read complete manual for full details.
www.gncindustries.com
Quick Reference
Initial Set-Up
• Set engine switch to “ON”
• Set engine gas shut-off to “OPEN” position
• Set engine choke to “OPEN”
• Set engine throttle to “FULL” (Rabbit)
• Set pump regulator red knob to “START”
• Set pump regulator black knob to “PRESSURE RELEASE”
• Pull engine recoil cord to start engine
• Set engine choke to “CLOSE”
• Set regulator valve - To “SPRAY”
• Adjust regulator knob to desired PSI
• Start Spraying. See calibration in Owners Manual
• Check pump and engine oil levels
• Check engine gas level. Add fuel as needed
• Fill Tank—DO NOT RUN UNIT DRY
Operations
Initial Set-Up
Video
Operation
Video
Air Chamber
Pressure Regulator
Pressure Gauge
Return Port
Oil Fill Plug
10” Belt Pulley
1/2” Output
1-1/4” Output
1-1/4” Input
1/2” Output Pump Stands