RIDGID GP90150A User manual

GP90150A
OPERATOR’S MANUAL
WHEELBARROW
AIR
COMPRESSOR
Toreduce the risk of injury,the user
must read and understand the
Operator’s Manual before using this
product.
IN629100AV 12/08 Printed in U.S.A.

2
Table of Contents
Section Page
Table of Contents ................2
Safety Instructions ...............3
Safety Signal Words . . . . . . . . . . . . .3
Before Using the Air
Compressor . . . . . . . . . . . . . . . . . . . .3
Spraying Precautions . . . . . . . . . . . .5
Breathable Air Warning . . . . . . . . . . .5
Warning Labels . . . . . . . . . . . . . . . . .6
Glossary of Terms ...............7
Unpacking and Checking
Content ........................7
Getting to Know Your Air
Compressor ....................8
Operating Your Air Compressor ...10
Moisture in Compressed Air . . . . . .10
Lubricaton . . . . . . . . . . . . . . . . . . . .11
Start-up . . . . . . . . . . . . . . . . . . . . . .11
To Start Gasoline Engine . . . . . . . .12
Section Page
Maintenance ...................13
Maintenance Schedule . . . . . . . . . .13
Tank . . . . . . . . . . . . . . . . . . . . . . . . .14
Filter Removal, Inspection, and
Replacement . . . . . . . . . . . . . . . . . .14
Drive Belt . . . . . . . . . . . . . . . . . . . . .15
Storage . . . . . . . . . . . . . . . . . . . . . .15
Troubleshooting ................16
Notes .........................19
Repair Parts ...................20
Notes .........................22
Warranty ......................24

3
Safety Instructions
This manual contains information that is
very important to know and understand.
This information is provided for SAFETY
and to PREVENT EQUIPMENT PROB-
LEMS. To help recognize this informa-
tion, observe the following symbols.
Safety Signal Words
Danger indicates an imminently haz-
ardous situation which, if not avoided,
WILL result in death or serious injury.
Warning indicates a potentially haz-
ardous situation which, if not avoided,
COULD result in death or serious injury.
Caution indicates a potentially hazardous
situation which, if not avoided, MAY
result in minor or moderate injury.
Notice indicates important information,
that if not followed, may cause damage
to equipment.
Since the air compressor and other com-
ponents (pump, spray guns, filters, lubri-
cators, hoses, etc.) used make up a high
pressure pumping system, the following
safety precautions must be observed at
all times:
1. Read all manuals includ-
ed with this product care-
fully.Be thoroughly famil-
iar with the controls and
the proper use of the equipment.
2. Follow all local safety codes as well
as the United States Occupational
Safety and Health Act (OSHA).
3. Only persons well acquainted with
these rules of safe operation should
be allowed to use the compressor.
4. Keep visitors away and NEVER allow
children in the work area.
5. Wear safety glasses
(meeting ANSI Z87.1 or
in Canada CSA Z94.3-99)
and use hearing protec-
tion when operating the
pump or unit. Everyday glasses are
not safety glasses.
6. Do not stand on or use the pump or
unit as a handhold.
7. Before each use, inspect compressed
air system, fuel system and electrical
components for signs of damage,
deterioration, weakness or leakage.
Repair or replace defective items
before using.
8. Check all fasteners at frequent inter-
vals for proper tightness.
9. Do not wear loose clothing or jewelry
that will get caught in the moving
parts of the unit.
Before Using the Air Compressor
MANUAL
Never operate
compressor without a
beltguard. Com-pressors can
start automatically without
warning. Personal injury or
property damage could occur
from contact with moving parts.
CALIFORNIA PROPOSITION 65
This product or its power cord
may contain chemicals,
including lead, known to the
State of California to cause
cancer and birth defects or
other reproductive harm. Wash
hands after handling.

10. Keep fingers away from a running
compressor; fast moving and hot
parts will cause injury and/or burns.
11. If the equipment should start to
vibrate abnormally, STOP the
engine/motor and check immediately
for the cause. Vibration is generally a
warning of trouble.
12. Check fuel level before starting the
engine. Do not fill the gas tank
indoors. Wipe off any spilled gas
before starting the engine.
13. Toreduce fire hazard, keep
engine/motor exterior free of oil, sol-
vent, or excessive grease.
14. Do not tamper with governor setting
on engine. Overspeeding the unit
severely shortens engine life and may
also be very hazardous.
4
Safety Instructions (continued)
NEVER refuel a running
or hot engine. Explosive fuel
can cause fires and severe
burns. Avoid overfilling fuel
tank.
Gasoline vapor is highly flam-
mable. Refill outdoors or only
in well ventilated areas. Do not
store, spill or use gasoline near
an open flame or heat devices
such as a stove, furnace, or
water heater, which utilize a
pilot light, or any device that
can create a spark. If gasoline
is accidentally spilled, move
unit away from the spill area
and avoid creating any source
of ignition until gasoline vapors
have dissipated.
Motors, electrical
equipment and controls can
cause electrical arcs that will
ignite a flammable gas or vapor.
Never operate or repair in or
near a flammable gas or vapor.
Never store flammable liquids
or gases in the vicinity of the
compressor.
Carbon monoxide can
cause severe nausea, fainting
or death. Do not operate unit
inside a closed building or a
poorly ventilated area.
Never remove or attempt to
adjust safety valve. Keep safety
valve free from paint and other
accumulations.
Never attempt to repair
or modify a tank! Welding,
drilling or any other modifica-
tion will weaken the tank result-
ing in damage from rupture or
explosion. Always replace worn
or damaged tanks.
Compressor parts may
be hot even if the unit is
stopped.

15. Tanks rust from moisture build-up,
which weakens the tank. Make sure to
drain tank daily and inspect periodical-
ly for unsafe conditions such as rust
formation and corrosion
.
16. Fast moving air will stir up dust and
debris which may be harmful.
Release air slowly when draining
moisture or depressurizing the com-
pressor system.
17.
STOP the engine whenever leaving the
work area, before cleaning, making
repairs or inspections. When cleaning,
repairing or inspecting, make certain all
moving parts have stopped. Disconnect
the spark plug wire and keep the wire
away from the plug to prevent acciden-
tal starting.
18. Allow engine to cool before storing.
5
19. Do not smoke when spraying paint,
insecticides, or other flammable sub-
stances.
20. Use a face mask/respirator when
spraying and spray in a well ventilat-
ed area to prevent health and fire
hazards.
21. Do not direct paint or other sprayed
material at the compressor. Locate
compressor as far away from the
spraying area as possible to mini-
mize overspray accumulation on the
compressor.
22. When spraying or cleaning with sol-
vents or toxic chemicals, follow the
instructions provided by the chemi-
cal manufacturer.
Spraying Precautions
Do not spray flammable
materials in vicinity of open
flame or near ignition sources
including the compressor unit.
Breathable Air Warning
This compressor/pump is not equipped and should not be used “as
is” to supply breathing quality air. For any application of air for
human consumption, the air compressor/pump will need to be fitted
with suitable in-line safety and alarm equipment. This additional
equipment is necessary to properly filter and purify the air to meet
minimal specifications for Grade D breathing as described in
Compressed Gas Association Commodity Specification G 7.1 - 1966,
OSHA 29 CFR 1910. 134, and/or Canadian Standards Associations
(CSA).
DISCLAIMER OF WARRANTIES
In the event the compressor is used for the purpose of breathing air
application and proper in-line safety and alarm equipment is not
simultaneously used, existing warranties shall be voided, and
Campbell Hausfeld disclaims any liability whatsoever for any loss,
personal injury or damage.

6
Safety Instructions (continued)
Find and read all warning labels found on
the air compressor shown below
Warning Labels
DK724100AV 10003

7
ASME Safety Valve
A safety valve that automatically releases
the air if the air receiver (tank) pressure
exceeds the preset maximum.
PSI (Pounds per Square Inch)
Measurement of the pressure exerted by
the force of the air. The actual psi output
is measured by a pressure gauge on the
compressor
SCFM (Standard Cubic Feet per
Minute)
Sometimes called CFM (Cubic Feet per
Minute). Measurement of air volume
delivered by the compressor.
Air Delivery
A combination of psi and SCFM. The air
delivery required by a tool is stated as
(number) SCFM at (number) psi. The
combination of these figures determines
what size unit is needed.
Air Tank Capacity
The volume of air stored in the tank and
available for immediate use. A large tank
allows the intermittent use of an air tool
with an air requirement higher than the
compressor’s rated delivery.
Regulator
A control that adjusts the line pressure to
the proper amount needed to operate
spray guns and air tools.
Tank Pressure Gauge
Indicates tank pressure in psi.
Line Pressure Gauge
Displays the current line pressures. It is
regulated by the regulator knob.
Cut-in/Cut-off Pressure
Specific psi at which a compressor starts
and stops while refilling the air tank.
Glossary of Terms
1. Remove the air compressor from the
carton.
2. Place the compressor on a secure,
stationary work surface and look it
over carefully.
Unpacking and Checking Contents
Do not operate unit if damaged
during shipping, handling or
use. Damage may result in
bursting and cause injury or
property damage.
For your own safety,never
operate unit until all assembly
steps are complete and until
you have read and understood
the entire operator’s manual.
To reduce the risk of injury, if
any parts are missing, do not
attempt to assemble the air
compressor until the missing
parts are obtained and installed
correctly.

ridgid.com 1-800-474-3443
DK724300AV 0104
8
Getting to Know Your Air Compressor
2Air Filter
3Dipstick/Oil Sight Glass
11 ASME
Safety Valve
9Regulator Knob
5Tank
Drain
Valve
6Unloader
1Beltguard
4Handles
7Air Storage Tank
12 Air Outlet Fittings
10 Tank
Pressure
Gauge
8Regulated
Outlet
Gauge
Model/Serial Number Decal

9
1.Belt Guard. The belt guard encloses
the pulleys and drive belt. It protects
the user from moving parts and
directs cooling air to the compressor
pump
2. Air Filter. The air filter keeps dirt and
debris from entering the compressor
pump and reduces compressor noise.
3. Dipstick/Oil Sight Glass. The dip-
stick and oil sight glass both measure
the oil level in the compressor pump.
Your compressor may have either a
dipstick or an oil sight glass.
4. Handles. Used to move the compres-
sor.
5. Tank Drain Valve. The tank drain
valve allows moisture to be removed
from the tank.
NOTE: Each tank has its own tank
drain valve.
6. Unloader. The unloader controls the
engine rpm. When loaded, the engine
will run at maximum operating speed
and air will enter the tank. When
unloaded, the engine will slow to an
idle and air will vent to atmosphere.
7. Air Storage Tanks. The tanks store
air for later use.
8.Regulated Outlet Gauge. This gauge
shows at-a-glance, air pressure at
outlet. Air pressure is measured in
pounds per square inch (PSI). Most
tools have maximum pressure ratings.
Never exceed the maximum pressure
rating of the tool you are using. Be
sure this gauge reads ZERO before
changing air tools or disconnecting
hose from outlet.
9. Regulator Knob. This knob controls
air pressure to an air operated tool or
paint spray gun. Turning the knob
clockwise increases air pressure at
the outlet. Turning counterclockwise
will lower air pressure at the outlet.
Fully counterclockwise will shut off the
flow of air completely.
10. Tank Pressure Gauge. Gauge
shows pressure in air receiver
indicating compressor is building
pressure properly.
11. ASME Safety Valve. This valve
automatically releases air if the
tank pressure exceeds the preset
maximum.
12. Air Outlet Fittings. These fittings
are 1/4” universal-style quick connect
fittings and allow rapid tool changes.
Close Open
Dipstick
Add Oil Fill
Line
Max
Low
Full
Add Oil

All lubricated compressor pumps dis-
charge some condensed water and oil
with the compressed air. Install appropri-
ate water/oil removal equipment and con-
trols as necessary for the intended appli-
cation.
10
Operating Your Air Compressor
Before starting the compressor,
thoroughly read all component
instruction manuals, especially
the engine manual.
Failure to install appropriate
water/oil removal equipment
may result in damage to
machinery or workpiece.
Drain liquid from tank daily.
Do not attach air tools to open
end of the hose until start-up is
completed and unit checks OK.
Moisture in Compressed Air
Moisture in compressed air will form into
droplets as it comes from an air compres-
sor pump. When humidity is high or when
acompressor is in continuous use for an
extended period of time, this moisture will
collect in the tank. When using a paint
spray or sandblast gun, this water will be
carried from the tank through the hose,
and out of the gun as droplets mixed with
the spray material.
IMPORTANT:This condensation will
cause water spots in a paint job, especial-
ly when spraying other than water based
paints. If sandblasting, it will cause the
sand to cake and clog the gun, rendering
it ineffective.
A filter in the air line, located as near to the
gun as possible, will help eliminate this
moisture.

11
This compressor is shipped with oil.
Use single viscosity, ISO 100 (SAE 30),
non-detergent compressor oil; or Mobil 1®
5W30 or 10W30 synthetic oil may also be
used. See illustration for proper oil fill.
Refer to engine manual for proper oil level
and type.
Lubrication
1. Fill engine with oil and gasoline per
instructions furnished with engine.
2. Remove the compressor dipstick
breather or check oil sight glass to ver-
ify proper oil level.
3. Turn manual unloader lever up to a
horizontal position to allow the com-
pressor pump to run without com-
pressing air.
Start-Up
Toensure proper operation,
unit must be on a level surface.
Manual Unloader Lever in the
Unloaded Position
Dipstick
Add Oil Fill
Line
Max
Low
Full
Add Oil

12
Operating Your Air Compressor
(continued)
4. Move the choke lever to the CHOKE
position, turn the fuel lever ON, and
turn the engine stop switch to the ON
position.
5. Pull start grip lightly until resistance is
felt, and then pull briskly.
6. As the engine warms up, gradually
move the choke lever to the open posi-
tion. See gas engine manual for more
details.
7. Run the compressor unloaded for
approximately 30 minutes to break in
the pump.
8. After approximately 30 minutes, move
the unloader lever down to the loaded
position. The compressor will begin to
pump air into the tank.
When maximum tank pressure is
reached, the compressor automatically
unloads, bringing the engine to idle. The
engine remains at idle until tank pressure
falls to a preset level. The engine then
accelerates and the compressor pumps
additional air into the tank.
To Start Gasoline Engine
Manual Unloader Lever
in the Loaded Position

13
In order to maintain efficient operation of
the compressor system, check the air fil-
ter weekly (per maintenance schedule),
oil level and gasoline level before each
use. The ASME safety valve should also
be checked weekly. Pull ring on safety
valve and allow the ring to snap back to
normal position. This valve automatically
releases air if the tank pressure exceeds
the preset maximum. If air leaks after the
ring has been released, or the valve is
stuck and cannot be actuated by the ring,
the ASME safety valve MUST be
replaced.
With engine OFF, clean debris from
engine, flywheel, tank, air lines and
pump cooling fins.
Maintenance
Release all pressure from the
system before attempting to
install, service, relocate or per-
form any maintenance.
Do not attempt to tamper with
the ASME safety valve!
Operation Daily Weekly Monthly 3 Months
Check Oil Level l
Drain Tank l
Check Air Filter l
Check Safety Valve l
Blow Dirt From Unit l
Check Belt Tightness l
Change Oil l
Maintenance Schedule

14
To change a filter, pull off the filter housing
cover.If filter element is dirty,replace ele-
ment or entire filter.
Filter Removal, Inspection and Replacement
Maintenance (continued)
The tanks should be carefully inspected
at a minimum of once a year. Look for
cracks forming near the welds. If a crack
is detected, remove pressure from tank
immediately and replace.
Tank
Never attempt to repair or modi-
fy a tank! Welding, drilling or
any other modification will
weaken the tank resulting in
damage from rupture or explo-
sion. Always replace worn,
cracked or damaged tanks.
Drain liquid from tanks daily.
Tank Drain (2)

15
Belt stretch is a result of normal use.
When properly adjusted, the belt deflects
about 1/2” with five pounds of pressure
applied midway between the engine pul-
ley and pump.
To adjust drive belt tension:
1. Remove belt guard and loosen
engine brace.
2. Loosen the four fasteners holding the
engine to the baseplate.
3. Shift the engine in the proper direc-
tion. The belt must be properly
aligned when adjustment is made.
4. To align belt, lay a straight edge
against the face of the flywheel,
touching the rim at two places.
5. Adjust flywheel or engine pulley so
that the belt runs parallel to the
straight edge.
6. Use a gear puller to move the pulley
on the shaft and tighten fasteners.
7. Adjust brace and reinstall belt guard.
Drive Belt
1/2” Deflection
Touch Rim of
Flywheel in Two
Places
Straight Edge Parallel With Belt
1. When not in use, hose and compres-
sor should be stored in a cool, dry
place.
2.
Tanks should be drained of moisture.
3. Hose should be disconnected and
hung with open ends down to allow
any moisture to drain.
Storage
Belt Straight Edge

16
Troubleshooting
For your own safety do not try
and run the air compressor
while troubleshooting.
TROUBLE PROBABLE CAUSE REMEDY
Low discharge pres-
sure
1. Air leaks
2. Leaking valves
3. Restricted air intake
4. Slipping belts
5. Blown gaskets
6. Low compression
1. Listen for escaping air.
Apply soap solution to all fit-
tings and connections.
Bubbles will appear at
points of leakage. Tighten or
replace leaking fittings or
connections
2. Remove head and inspect
for valve breakage, weak
valves, scored valve seats,
etc. Replace defective parts
and reassemble.
Be sure that the old head
gasket is replaced with a
new one each time the head
is removed
3. Clean the air filter element
4. Loosen engine clamping
bolts and move the engine
in a direction away from the
compressor, being sure that
the engine pulley is perfectly
aligned with the flywheel.
Tighten engine clamping
bolts. The belt should
deflect about 1/2” under 5-
lbs of force. Do not “roll”
belts over pulleys
5. Replace any gaskets proven
faulty on inspection
6. Low pressure can be due to
worn rings and cylinder
walls. Correction is made by
replacing the rings, cylin-
ders, and pistons as
required

17
TROUBLE PROBABLE CAUSE REMEDY
Overheating
Excessive belt wear
Unit stalls
Excessive noise
(knocking)
1. Poor ventilation
2. Dirty cooling surfaces
1. Pulley out of alignment
2. Belt too loose or too tight
3. Belt slipping
4. Pulley wobbles
1. Low engine idle
2. Improper lubrication
3. Low oil level
4. Defective unloader valve
1. Loose engine or com-
pressor pulley
2. Lack of oil in crankcase
3. Worn connecting rod
4. Worn piston pin bushing
1. Relocate the compressor
to an area where an ample
supply of cool, clean, dry
and well-circulated air is
available
2. Clean the cooling surfaces
of pump and motor/engine
1. Realign engine pulley with
compressor pulley
2. Adjust tension (See Drive
Belt Section)
3. Adjust tension or replace
belt (See Drive Belt
Section)
4. Check for worn crankshaft,
keyway or pulley bore
resulting from running the
compressor or motor with
loose pulleys. Check for
bent pulleys or bent crank-
shaft
1. Increase idle, refer to
engine manual for details
2. See LUBRICATION, under
Assembly
3. Check oil level. Fill if nec-
essary
4. Replace
1. Loose engine or compres-
sor pulleys are a very com-
mon cause of compressors
knocking. Tighten pulley
clamp bolts and set-screws
2. Check for proper oil level; if
low, check for possible
damage to bearings. Dirty
oil can cause excessive
wear
3. Replace connecting rod
4. Remove piston assemblies
from the compressor and
inspect for excess wear.
Replace excessively worn
piston pin or pistons, as
required

18
Troubleshooting
TROUBLE PROBABLE CAUSE REMEDY
Excessive noise
(knocking)
Continued
Oil in the discharge
air
5. Worn bearings
6. Piston hitting the valve
plate
7. Noisy check valve
1. Worn piston rings
2. Compressor air intake
restricted
3. Restricted breather
4. Excessive oil in compres-
sor
5. Wrong oil viscosity
6. Connecting rod out of
alignment
5. Replace worn bearings
and change oil
6. Remove the compressor
head and valve plate and
inspect for carbon deposits
or other foreign matter on
top of piston. Replace
head and valve plate using
new gasket
7. Replace
1. Replace with new rings
2. Clean filter. Check for other
restrictions in the intake
system
3. Clean and check breather
for free operation
4. Drain down to full level
5. Use SAE 30 (ISO 100)
non-detergent compressor
oil
6. Replace rod

19
Notes

20
Repair Parts
1
23
24
22
25
26 27
28
29
30
31
32
33
34 35
2
3
4
5
8
6
9
7
10
11
13
14
15
18
16
17
20
19
21
11
19
7
12
36 44
45
37
38
39
40
41
46
42
43