FULLER O’BRIEN PRO 3515 User manual

OWNER’S MANUAL 308-526
Rev A
This manual contains IMPORTANT
WARNINGS
and INSTRUCTIONS
READ AND RETAIN FOR REFERENCE
FULLER O’BRIEN PRO 3515, 4020, 4030
Pressure W ashers
PRO 3515, 5 HP ENGINE
P/N 800–584, Series A
1500 psi (103 bar) OPERA TING PRESSURE
1900 psi (131 bar) MAXIMUM WORKING PRESSURE
PRO 4020, 8 HP ENGINE
P/N 800–585, Series A
2000 psi (138 bar) OPERA TING PRESSURE
2400 psi (165 bar) MAXIMUM WORKING PRESSURE
PRO 4030, 1 1 HP ENGINE
P/N 800–586, Series A
3000 psi (207 bar) OPERA TING PRESSURE
3400 psi (234 bar) MAXIMUM WORKING PRESSURE

FULLER O’BRIEN CORPORA TION, 450 EAST GRAND A VENUE, SAN FRANCISCO, CA 94080
COPYRIGHT 1990, GRACO INC.
TM
PRO 4030
PRO 3515
PRO 4020

308–526
INDEX
Warnings 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Startup 6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Shutdown, Flushing and Storage 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance 8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting Chart 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pro 3515 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pro 4020 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pro 4030 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Gear Reducer (3515) 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Gear Reducer (4020) 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pump (3515) 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pump (4020) 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pump (4030) 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pump Service 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Accessories 27 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Technical Data 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Warranty Back Cover. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TERMS
WARNING: Alerts user to avoid or correct conditions
that
could cause bodily injury .
CAUTION: Alerts user to avoid or correct conditions
that
could cause damage to the equipment.
NOTE: Identifies helpful procedures and information.

3
308–526
WARNING
HIGH PRESSURE SPRAY CAN CAUSE SERIOUS INJURY.
FOR PROFESSIONAL USE ONLY. OBSERVE ALL WARNINGS.
Read and understand all instruction manuals before operating equipment.
FLUID INJECTION HAZARD
General Safety
This pressure washer generates very high fluid
pressure. Spray from the gun, leaks or ruptured
components can inject fluid through your skin and into
your body and cause extremely serious bodily injury
including
the need for amputation. Also, fluid injected or
splashed into the eyes or on the skin can cause serious
damage.
NEVER point the spray gun or wand at anyone or at any
part of the body . NEVER put hand or fingers over the
spray
tip.
ALWAYS follow the Pressure Relief Procedure , before
cleaning or servicing any part of the sprayer .
NEVER try to stop or deflect leaks with your hand or
body.
Be sure equipment safety devices are operating
properly
before each use.
Medical Treatment
If any fluid appears to penetrate your skin, get
EMERGENCY
MEDICAL TREA TMENT A T ONCE. DO
NOT TREA T AS A SIMPLE CUT . T ell the doctor exactly
what fluid was injected.
NOTE TO PHYSICIAN: Injection in the skin is a
traumatic
injury . It is important to treat the injury
surgically as soon as possible. Do not delay
treatment
to research toxicity . T oxicity is a concern
with some exotic coatings injected directly into the
bloodstream. Consultation with a plastic surgeon
or
reconstructive hand surgeon may be advisable.
Pressure Relief Procedure
To reduce the risk of serious bodily injury , including fluid
injection and splashing in the eyes or on the skin, always
follow this procedure whenever you stop spraying for
more
than 10 minutes, when shutting down, and before
checking or repairing any part of the system.
1. Engage the trigger safety latch.
2. T urn the sprayer of f.
3.
Remove the ignition cable from the spark plug.
4. Shut of f the water supply .
5. Disengage the trigger safety latch and trigger the
gun
to relieve pressure, and then engage the trigger
safety latch again.
6. Before long–term (overnight) storage or
transporting
of the unit, disconnect the water supply
and turn of f the fuel supply valve.
Spray Gun Safety Devices
Be sure all gun safety devices are operating properly
before
each use. Do not remove or modify any part of the
gun; this can cause a malfunction and result in serious
bodily
injury .
SAFETY LATCH: Whenever you stop spraying for a
moment,
always set the gun safety latch in the engaged
or “safe” position, making the gun inoperative. Failure to
properly set the safety latch can result in accidental
triggering
of the gun.
SPRAY TIP SAFETY: Use extreme caution when
cleaning
or changing spray tips. If a spray tip clogs while
spraying, engage the gun safety latch immediately .
ALWAYS follow the Pressure Relief Procedure and
then
remove the spray tip to clean it.
MOVING P ARTS HAZARD
Moving parts can pinch or amputate fingers or other
body
parts. KEEP CLEAR of moving parts when starting
or operating the pressure washer .
NEVER operate the pressure washer without all guards
and interlocks installed and functioning. Follow the
Pressure Relief Procedure before checking or
servicing the pressure washer to prevent discharging
high
pressure fluid from the gun.
W arnings continued on page 4.

4308–526
EQUIPMENT MISUSE HAZARD
General Safety
Any misuse of the pressure washer or accessories,
such as overpressurizing, modifying parts, using
incompatible chemicals and fluids, or using worn or
damaged
parts, can cause them to rupture and result in
fluid injection, splashing in the eyes or on the skin, or
other serious bodily injury , fire, explosion or property
damage.
NEVER alter or modify any part of this equipment; doing
so could cause it to malfunction.
CHECK all spray equipment regularly and repair or
replace
worn or damaged parts immediately .
ALWAYS wear protective eyewear and appropriate
clothing.
If using a chemical injector , read and follow the
chemical manufacturer ’s literature for
recommendations on additional protective equipment,
such
as a respirator .
System Pressure
This sprayer can develop high operating pressures. Be
sure that all spray equipment and accessories are rated
to withstand the maximum working pressure of this
sprayer.
DO NOT exceed the maximum working
pressure of any component or accessory used in the
system.
Chemical Compatibility
BE SURE that all chemicals used in the chemical
injector
are compatible with the wetted parts of the hose,
gun, wand and tip, as given in the T echnical Data (inside
back cover). Always read the chemical manufacturer ’s
literature before using any chemical in this pressure
washer.
HOSE SAFETY
High pressure fluid in the hoses can be very dangerous.
If the hose develops a leak, split or rupture due to any
kind
of wear , damage or misuse, the high pressure spray
emitted from it can cause a fluid injection injury or other
serious bodily injury or property damage.
ALL FLUID HOSES MUST HA VE STRAIN RELIEFS
ON BOTH ENDS.
The strain reliefs help protect the
hose from kinks or bends at or close to the coupling,
which
can result in hose rupture.
TIGHTEN all fluid connections securely before each
use.
High pressure fluid can dislodge a loose coupling or
allow high pressure spray to be emitted from the
coupling.
NEVER use a damaged hose. Before each use, check
entire hose for cuts, leaks, abrasion, bulging cover , or
damage or movement of the hose couplings. If any of
these conditions exist, replace the hose immediately .
DO NOT try to recouple high pressure hose or mend it
with tape or any other device. A repaired hose cannot
contain
the high pressure fluid.
HANDLE AND ROUTE HOSES CAREFULLY. Do not
pull
on hoses to move the pressure washer . Do not use
chemicals which are not compatible with the inner tube
and cover of the hose. DO NOT expose Graco hose to
temperatures above 200 _ F (93 _ C) or below –40 _ F
(–40_ C).
FUEL AND EMISSION HAZARDS
NEVER fill the fuel tank while the unit is running or hot.
The fuel used in this unit is combustible and when spilled
on a hot surface can ignite and cause a fire. ALWAYS fill
tank slowly to avoid spilling.
NEVER operate the unit in a closed building. The
exhaust contains carbon monoxide, a poisonous,
odorless,
invisible gas which can cause serious injury or
death if inhaled.
NEVER alter the throttle setting, which is factory set.
Tampering with this adjustment can damage the
pressure
washer and will void the warranty .
IMPORTANT
United States Government safety standards have been adopted under the Occupational Safety and Health Act. These
standards—particularly the General Standards, Part 1910, and the Construction Standards, Part 1926—should be
consulted.

5
308–526
INSTALLATION
Figure 1
SPRAY
GUN
SPRAY
HOSE
QUICK
COUPLER
QUICK
COUPLER
INLET WATER
CONNECTION 3/4”
GARDEN HOSE
HIGH
PRESSURE HOSE
CONNECTION
HIGH
PRESSURE
HOSE
CONNECTION
INLET WATER
CONNECTION 3/4”
GARDEN HOSE
PRO 4020
PRO 3515
PRO 4030
INLET WATER
CONNECTION 3/4”
GARDEN HOSE
HIGH PRESSURE
HOSE CONNECTION
Check for Shipping Damage
Check the unit for any damage that may have occurred
in shipping. Notify the carrier immediately if there is
any
damage.
Set Up
If you are using a downstream chemical injector , install it
between the pump unloader and the high pressure hose,
using the quick couplers provided.
Connect the high pressure hose between the pump
outlet and the gun inlet. Both of these connections are
made
with quick couplers.
CAUTION
Up to 100 ft (30 m) of high pressure hose may
be used. Longer hoses may af fect sprayer
performance, and chemical injector
performance,
if used.
Install the appropriate spray tip on the wand. See
Installing and Changing Spray T ips. If you are using a
sandblaster kit, see its separate manual for installation
instructions.
Connect to Water Supply
CAUTION
Before attaching to the water supply , check
your local plumbing code regarding cross–
connection to the water supply . A backflow
preventer,
P/N 801–133, is available to prevent
backflow of contaminated water into the fresh
water
supply . Install it upstream from the pump.
If inlet water pressure is over 60 psi (4.1 bar) a
regulating water valve, P/N 800–258, must be
installed
at the garden hose connection.
Do not exceed 160 _ F (70_ C) inlet water
temperature.
Connect
a hose with at least a 3/4 inch (19 mm) ID from
the water supply to the unit’ s 3/4 inch garden hose inlet.
The supply hose should not be more than 50 ft (15 m)
long.
NOTE: The water source at the unit
must have a
minimum
flow rate equal to that of the unit (see
Technical Data, inside back cover).

6308–526
STARTUP
Always use this start–up procedure to ensure that the
unit
is started safely and properly .
1. Check oil levels.
Engine: Add SAE 30 or 10W–30 weight detergent oil
as necessary .
Pump: Add SAE 20 or 30 weight non–detergent oil
as necessary .
NOTE: All units are equipped with a low–oil sensor
that shuts the engine of f if the oil level falls
below a certain level. If the unit stops
unexpectedly, check both the oil and the fuel
levels.
Check the oil level each time the unit is
refueled.
2. Check
fuel level.
WARNING
DO NOT refuel a hot engine. Refueling a hot
engine
could cause a fire. Use only fresh, clean
regular or unleaded gasoline. Close the fuel
shutoff
valve during refueling.
3. T urn on the water supply .
CAUTION
Never run the unit dry . Costly damage to the
pump will result. Always be sure the water
supply is completely turned on before
operating.
4. Trigger the gun until water sprays from the tip
indicating
that the air is purged from the system.
5. Open the fuel shutof f valve. Be sure the spark plug
ignition cable is pushed firmly onto the spark plug.
On those units equipped with an ignition shutof f
switch,
put the switch in the “on” position and put the
throttle in the “run” position.
6. Start the engine.
NOTE: For easier starting, have one person start the
pressure washer while another person
triggers
the spray gun.
If the engine is cold, completely close the engine
choke.
Grasp the starter rope, brace one foot on the
pressure washer chassis and pull rope rapidly and
firmly. Continue holding the rope as it returns. Pull
and return the rope until the engine starts. In cool
weather, the choke may have to be kept closed for
10 to 30 seconds before opening it to keep the
engine
running. Otherwise, open the choke as soon
as the engine starts.
If the engine is warm, leave the choke open, or just
partly close it. Start the engine as described in the
preceding paragraph. When it starts, be sure to
open
the choke completely .
CAUTION
On r ecoi l s tar t e ngines , n eve r l e t t h e s tarte r r ope
return
b y i tself . I t c oul d j am the recoi l s ystem.
7.
ALWAYS engage the gun’ s trigger safety latch
whenever
you stop spraying, even for a moment, to
reduce the risk of fluid injection or splashing in the
eyes
or on the skin if the gun is bumped or triggered
accidentally.
8.
ALWAYS observe the following CAUTIONS to
avoid
costly damage to the pressure washer .
CAUTION
DO NOT allow the pressure washer to idle for
more
than 10 minutes. Doing so may cause the
recirculating water to overheat and seriously
damage the pump. T urn of f the pressure
washer if it will not be spraying or cleaning at
least every 10 minutes. If heated inlet water is
used,
reduce this time further .
DO NOT run the pump dry , which will quickly
damage
the pump. Be sure the water supply is
fully turned on before starting the pump.
DO NOT operate the pressure washer with the
inlet water screen removed. This screen helps
keep abrasive sediment out of the pump, which
could clog or scratch the pump. Keep this
screen
clean.
DO NOT pump caustic materials; such
materials
may corrode the pump components.
9. See the chemical injector or sandblaster kit manual
for detailed cleaning information if these
accessories
are used.

7
308–526
Trigger Safety Latch
WARNING
To reduce the risk of serious bodily injury ,
including
fluid injection, splashing in the eyes or
on the skin, ALWAYS engage the trigger safety
latch whenever spraying stops, even for a
moment.
In
the engaged position, the trigger safety latch
prevents the gun from being triggered
accidentally by hand or if it is dropped or
bumped.
Be sure the latch is pushed fully down
when engaging it or it cannot prevent the gun
from
being triggered. See Figure 2.
Figure 2
TRIGGER SAFETY LA TCH SHOWN ENGAGED
TRIGGER SAFETY LA TCH SHOWN
DISENGAGED
Installing and Changing Spray Tips
WARNING
To reduce the risk of serious bodily injury ,
including
fluid injection or splashing in the eyes
or onto the skin, use extreme caution when
changing spray tips.
ALWAYS follow the
procedure
below .
1.
Follow the Pressure Relief Procedure .
2. Point the gun and wand away from yourself and
anyone
else.
3. Without holding your hand over the spray tip (A), pull
back the quick coupler ring (B). Remove the old tip
and/or install a new one, and then release the ring.
See Figure 3.
4. Be sure the tip is secure before starting to spray
again.
5. Tip
holding holes are provided on the chassis.
CAUTION
To avoid blowing the o–ring out of the quick
coupler,
due to the high pressure in the system,
never operate the pressure washer without a tip
securely mounted in the quick coupler .
Figure 3
A
B

8308–526
SHUTDOWN, FLUSHING
AND STORAGE
WARNING
Pressure Relief Procedure
To reduce the risk of serious bodily injury ,
including fluid injection and splashing in the
eyes, or on the skin, always follow this
procedure whenever you stop spraying for
more than 10 minutes, when shutting down,
and
before checking or repairing any part of the
system.
1. Engage the trigger safety latch.
2. T urn the sprayer of f.
3. Remove the ignition cable from the spark
plug.
4. Shut
of f the water supply .
5. Disengage the trigger safety latch and
trigger
the gun to relieve pressure, and then
engage the trigger safety latch again.
6. Before long–term (overnight) storage or
transporting of unit, disconnect the water
supply,
and turn of f the fuel supply valve.
1. If the pressure washer will be exposed to freezing
temperatures, drain all water out of the pump. If it
must be stored in freezing temperatures, flush the
unit with a 50% anti–freeze solution. Relieve
pressure.
Flush the pressure washer before using it
again to remove the anti–freeze.
NOTE: An anti–freeze flush kit, P/N 802–327, is
available
to make flushing easier .
CAUTION
If water does freeze in the pressure washer ,
thaw it in a warm room before trying to start it.
DO NOT pour hot water on or into the pump; it
may crack the ceramic plungers!
2. After each use, wipe all surfaces of the pressure
washer
with a clean, damp cloth.
3. Perform the appropriate maintenance. See
maintenance
chart.
MAINTENANCE
Observing regular maintenance intervals helps ensure
that you get maximum performance and life from the
pressure
washer .
There
is a break–in period for the engine, pump and gear
reducer (if used). After changing the oil in these
components
following their respective break–in periods,
the interval between required changes is longer .
If the unit is operating in dusty conditions, these
maintenance
checks should be made more often.
WARNING
To reduce the risk of serious bodily injury ,
including
fluid injection, splashing in the eyes or
on the skin or injury from moving parts, always
follow the Pressure Relief Procedure
Warning
before proceeding.
Interval
Daily
After first 5
hours of
operation
Each 25 hours
of operation
After first 50
hours of
operation
Each 100 hours
of operation
or 3 months
Each 500 hours
of operation
or 6 months
What to do
Clean water inlet screen and
filter . Check engine and pump oil
levels. Fill as necessary . Check
gasoline level. Fill as necessary .
Change engine break–in oil.
Drain oil when warm. Use SAE
30 or 10W–30 detergent oil.
Clean and remove air cleaner
foam. Wash with water and
detergent. Dry thoroughly . Rub
with oil and squeeze to distribute
oil.
Change pump break–in oil. Use
SAE 20 or 30 non–detergent oil.
Change gear reducer oil. Use
SAE 90 gear oil.
Clean or replace paper air
cleaner cartridge. T ap gently to
remove dirt. Change engine oil.
Use SAE 30 or 10W–30
detergent oil.
Change pump oil. Use SAE 20
or 30 non–detergent oil. Change
gear reducer oil. Use SAE 90
gear oil.

9
308–526
TROUBLESHOOTING CHART
WARNING
To reduce the risk of serious bodily injury , including fluid injection, splashing in the eyes or on the skin or
injury from moving parts, always follow the Pressure Relief Procedure W arning before proceeding.
PROBLEM CAUSE SOLUTION
Low
pressure and/or
pump runs rough
Partially plugged air cleaner filter .
Spark plug dirty , wrong gap or wrong type.
Remove and clean.
Clean, adjust the gap or replace.
Replace with tip of proper size.
Clean. Check more frequently .
Check filter. Replace packings. See PUMP SERVICE.
Check water flow rate to pump.
Clean inlet and discharge valve assemblies. Check
filter.
T
ighten or replace; use correct belts and replace both
at same time.
Check garden hose, may be collapsed or kinked.
Replace worn valves.
Replace high pressure hose.
W orn or wrong size tip.
Inlet filter clogged.
W orn packings, abrasives in water or
natural wear .
Inadequate water supply .
Fouled or dirty inlet or discharge valves.
Even a small particle can cause the valve
to stick.
Belt slippage.
Restricted inlet.
W orn inlet or discharge valves.
Leaking high pressure hose.
Engine misses or
lacks power
Engine will not start or
is hard to start
Fill the tank with gasoline, open fuel shut of f valve.
Check fuel line and carburetor .
Add to proper level.
Move switch to start position.
Drain fuel tank and carburetor . Use new fuel and dry
spark plug.
Open choke and crank engine several times to clear
out gas.
Remove and clean.
Clean, adjust the gap or replace.
T rigger spray gun.
No gasoline in fuel tank or carburetor .
Low oil.
Start/Stop switch in Stop position.
W ater in gasoline or old fuel.
Choked improperly . Flooded engine.
Dirty air cleaner filter .
Spark plug dirty , wrong gap or wrong type.
Spray gun closed.
W ater leakage from
under pump manifold
Install new packings. See PUMP SER VICE.W orn packings.
W ater in pump
Humid air condensing inside crankcase.
W orn packings.
Oil seals leaking.
Change oil as specified in MAINTENANCE.
Install new packings. See PUMP SER VICE.
Install new oil seals. See PUMP SER VICE.
Frequent or premature
failure of the packings
Scored, damaged or worn plungers.
Abrasive material in the fluid being pumped.
Inlet water temperature too high.
Overpressurizing pump.
Excessive pressure due to partially plugged
or damaged tip.
Pump running too long without spraying.
Running pump dry .
Install new plungers. See PUMP SER VICE.
Install proper filtration on pump inlet plumbing.
Check water temperature; may not exceed 160 F.
Do not modify any factory–set adjustments. See
EQUIPMENT MISUSE HAZARD.
Clean or replace tip. See Installing and Changing
Spray Tips.
Never run pump more than 10 minutes without
spraying.
Do not run pump without water .
Strong surging at the
inlet and low pressure
on the discharge side
Foreign particles in the inlet or discharge
valve or worn inlet and/or discharge valves.
Clean or replace valves. See PUMP SER VICE.
Oil leakage between
the gear reducer cover
and case
W orn gasket. Replace the gasket. See SER VICE SECTION.
Oil leakage between
the gear reducer cover
and the pump
W orn oil seals and/or o-ring. Replace oil seals and/or o-ring. See SER VICE
SECTION.
Oil leakage between
the gear reducer case
and the engine
W orn oil seal. Replace oil seal. See SER VICE SECTION.

10 308–526
PARTS DRAWING
800–584 PRO 3515 Pressure W asher
4
56 57
55
20
17 11
11
18
14
10
46
6
60
63
29
31
61
16
27
30
9
16
18
19
7
13
54
3
2
53
33
44
46
6
645
41
32
40
39
36 35
34
38
37
36
67
36
50
51
36
35
40
52
42
43
47
64
48
49
66
6
46
6
8
1
12
27
30
22
23
24
25
26
21

11
308–526
PARTS LIST
800–584 PRO 3515 Pressure W asher
REF PART
NO. NO. DESCRIPTION QTY
1 803–264
ENGINE, 5 hp, Honda OHV 1
2 802–300
PUMP & GEAR REDUCER
ASSEMBL Y (incl. 3, 13) 1
3 802–266
GEAR REDUCER (see page 16) 1
4 802–127 SCREW
, Cap, hex hd.
5/16–18 x 1-3/4 4
6 100–527 W
ASHER, Flat 5/16 18
7 803–893 BRACKET
, Support 1
8 801–367
BUMPER, Rubber 2
9 801–907 W
ASHER, Flat 1
10 801–905
ADAPTER, 3/8 G x 3/8 NPT 1
11 156–849
NIPPLE, Hex 3/8 2
12 802–316
UNLOADER, Preset 1500 psi 1
13 802–265
PUMP ASSEMBL Y , 1500 psi
(see page 20) 1
14 801–709
PLUG, Square hd. 1/4 1
16 801–568
QUICK COUPLER, Male 3/8 2
17 802–627
NIPPLE, Hex 3/8 NPSM x
1/4 NPT 1
18 803–869
HOSE, Bypass 1
19 801–622
CROSS, 1/2 1
20 801–523
NIPPLE, 1/2 x 2 1
21 800–115 VAL
VE, Thermal Relief 1
22
804–073 ADAPTER, 1/2 1
23 801–111 NUT
, Garden Hose 1
24 801–110
ADAPTER, Garden Hose 1
25 804–051 STRAINER/FILTER 1
26 402–278
PLUG, Plastic 1
27 156–082
O–RING, Quick Coupler 3/8 2
28 154–594
O–RING, Quick Coupler 1/4 1
29 802–579
HOSE, High Pressure, 3/8 x 50’ 1
30 801–569
QUICK COUPLER, Female
3/8 (incl. 27) 2
31 800–392
GUN & W AND ASSEMBL Y
(incl. 1 1, 59, 60, 61, 62, 63) 1
32 800–662 CHASSIS 1
33 803–925 HANDLE 1
34 800–561
FRONT LEG ASSEMBL Y
(incl. 35, 36, 50, 51, 67) 1
REF P
ART
NO. NO. DESCRIPTION QTY
35 801–546 SCREW
, Cap, hex hd.
3/8–16 x 1-1/4 5
36 100–023 W
ASHER, Flat 3/8 10
37 100–133 W
ASHER, Lock 3/8 4
38 100–307 NUT
, Hex 3/8–16 4
39 802–139 AXLE 1
40 801–235 W
ASHER, Flat 5/8 4
41 106–062
WHEEL & TIRE ASSEMBL Y2
42 101–545
PIN, Cotter 1/8 x 1-1/2 2
43 104–811
HUB CAP 2
44 801–539 BUMPER 1
45 801–941 SCREW
, Cap, hex hd.
5/16–18 x 1 4
46 111–040 NUT
, Lock 5/16–18 10
47 801–012 GROMMET
, Rubber 4
48 800–174
TIP ASSEMBL Y , 00055
(incl. 64, 66) 1
49 800–173
TIP ASSEMBL Y , 15055
(incl. 64, 66) 1
50 800–564 BRACKET, Front Leg 1
51 801–504
BUMPER, Rubber 1
52 179–885
LABEL, Chassis 1
53 802–781 KEY
, Square 1/4 x 2 1
54 803–083
LABEL, Keep From Freezing 1
55 181–867
LABEL, W arning 1
56 803–496
LABEL, Model 3515 1
57 802–363
LABEL, Caution 1
59 801–009
QUICK COUPLER, Female 1/4
(incl. 28) 1
60 801–134 W
AND, 32” 1
61 801–674
SLEEVE, 28” 1
63 803–350
GUN, Spray
(see Inst. Manual 308–51 1) 1
64 801–090
QUICK COUPLER, Male 1/4 4
65 801–730 TIP
, Spray 00055 1
66 801–729 TIP
, Spray 15055 1
67 801–499 NUT
, Lock 3/8–16 1

12 308–526
PARTS DRAWING
800–585 PRO 4020 Pressure W asher
4
6
1
57
33
44
46
6
645
41
32
40
43
39
36 35
58
34
38 37
36
67
36
50
51
36
35
20
12
17 11
11
18
16
18
14
10
46
6
78
40
52
42
53
2
3
13
54
60
63
29
31
61
16
9
19
59
47
64
48
49
66
6
46
55
27
30
19
22
23
24
25
26
21

13
308–526
PARTS LIST
800–585 PRO 4020 Pressure W asher
REF PART
NO. NO. DESCRIPTION QTY
1 802–998
ENGINE, 8 hp, Honda OHV 1
2 802–299
PUMP & GEAR REDUCER
ASSEMBL Y (incl. 3, 13) 1
3 802–143
GEAR REDUCER (see page 18) 1
4 802–127 SCREW
, Cap, hex hd.
5/16–18 x 1-3/4 4
6 100–527 W
ASHER, Flat 5/16 18
7 803–491 BRACKET
, Support 1
8 801–367
BUMPER, Rubber 2
9 801–907 W
ASHER, Flat 1
10 801–905
ADAPTER, 3/8 G x 3/8 NPT 1
11 156–849
NIPPLE, Hex 3/8 2
12 802–315
UNLOADER, Preset 2000 psi 1
13 803–405
PUMP ASSEMBL Y , 2000 psi
(see page 22) 1
14 801–709
PLUG, Square hd. 1/4 1
16 801–568
QUICK COUPLER, Male 3/8 2
17 802–627
NIPPLE, Hex 3/8 NPSM x
1/4 NPT 1
18 803–869
HOSE, Bypass 1
19 801–622
CROSS, 1/2 1
20 801–523
NIPPLE, 1/2 x 2 1
21 800–115 VAL
VE, Thermal Relief 1
22 804–073
ADAPTER, 1/2 1
23 801–111 NUT
, Garden Hose 1
24 801–110
ADAPTER, Garden Hose 1
25 804–051 STRAINER/FILTER 1
26 402–278
PLUG, Plastic 1
27 156–082
O–RING, Quick Coupler 3/8 2
28 154–594
O–RING, Quick Coupler 1/4 1
29 802–579
HOSE, High Pressure, 3/8 x 50’ 1
30 801–569
QUICK COUPLER, Female
3/8 (incl. 27) 2
31 800–392
GUN & W AND ASSEMBL Y
(incl. 1 1, 59, 60, 61, 62, 63) 1
32 800–662 CHASSIS 1
33 803–925 HANDLE 1
34 800–561
FRONT LEG ASSEMBL Y
(incl. 35, 36, 50, 51, 67) 1
REF P
ART
NO. NO. DESCRIPTION QTY
35 801–546 SCREW
, Cap, hex hd.
3/8–16 x 1-1/4 1
36 100–023 W
ASHER, Flat 3/8 10
37 100–133 W
ASHER, Lock 3/8 4
38 100–307 NUT
, Hex 3/8–16 4
39 802–139 AXLE 1
40 801–235 W
ASHER, Flat 5/8 4
41 106–062
WHEEL & TIRE ASSEMBL Y2
42 101–545
PIN, Cotter 1/8 x 1-1/2 2
43 104–811
HUB CAP 2
44 801–539 BUMPER 1
45 801–941 SCREW
, Cap, hex hd.
5/16–18 x 1 4
46 111–040 NUT
, Lock 5/16–18 6
47 801–012 GROMMET
, Rubber 4
48 800–174
TIP ASSEMBL Y , 00055
(incl. 64, 66) 1
49 800–173
TIP ASSEMBL Y , 15055
(incl. 64, 66) 1
50 801–564 BRACKET, Front Leg 1
51 801–504
BUMPER, Rubber 1
52 179–885
LABEL, Chassis 1
53 802–781 KEY
, Square 1/4 x 2 1
54 803–083
LABEL, Keep From Freezing 1
55 181–867
LABEL, W arning 1
57 802–363
LABEL, Caution 1
58 803–497
LABEL, Model, 4020 1
59 801–009
QUICK COUPLER, Female 1/4
(incl. 28) 1
60 801–134 W
AND, 32” 1
61 801–674
SLEEVE, 28” 1
63 803–350
GUN, Spray
(see Inst. Manual 308–51 1) 1
64 801–090
QUICK COUPLER, Male 1/4 4
65 801–730 TIP
, Spray 00055 1
66 801–729 TIP
, Spray 15055 1
67 801–499 NUT
, Lock 3/8–16 1

14 308–526
PARTS DRAWING
800–586 PRO 4030 Pressure W asher
36
2
39
38
45
44
46
62
60
61
63
64
59
2
18
19
4
892
23
10
2
9
22
7
14
11 12
13
2
51
66
67
68
69
53
56
21
16
20
1
28
65
29
30
31
32
92
25
2915
43
54
37
27
26
17
40 41
9
8
33
47
42
9
2
6
2
3
5
49
48
23

15
308–526
PARTS LIST
800–586 PRO 4030 Pressure W asher
REF PART
NO. NO. DESCRIPTION QTY
1 800–392
GUN & W AND ASSEMBL Y (incl.
16, 21, 52, 53, 54, 56, 57) 1
2 100–023 W
ASHER, Flat 5/16 30
3 801–941 SCREW
, Cap, hex hd.
5/16–18 x 1 9
4 801–539 BUMPER 1
5 803–927 BEL
T GUARD 1
6 803–534
LABEL, Belt Guard 1
7 800–587 CHASSIS 1
8 100–188 NUT
, Hex 5/16–18 9
9 100–214 W
ASHER, Lock 5/16 15
10 801–550
WHEEL & TIRE ASSEMBL Y2
11 801–612 W
ASHER, Flat 1/2 2
12 801–020 NUT
, Lock 1/2–13 2
13 801–556 AXLE 1
14 800–678 BRACKET
, Rail Stif fener 1
15 801–546 SCREW
, Cap, hex hd.
3/8–16 x 1-1/4 4
16 801–569
QUICK COUPLER, Female 3/8
(incl. 34) 2
17 801–522 SCREW
, Cap, hex hd. 2
18 800–565
FRONT LEG ASSEMBL Y
(incl. 2, 59, 60, 61, 62, 63, 64) 1
19 803–925 HANDLE 1
20 801–571
HOSE, High Pressure 3/8 x 50’ 1
21 801–568
QUICK COUPLER, Male 3/8 2
22 803–298 SCREW
, Cap, hex hd.
5/16–18 x 3-1/2 1
23 800–375
HOSE ASSEMBL Y W/QUICK
COUPLERS (incl. 16, 20, 21) 1
25 802–016 BRACKET
, Rail Stif fener 1
26 176–250
LABEL, Chassis 1
27 172–981
LABEL, Chassis 1
28 801–548 GROMMET
, Rubber 5
29 800–314
TIP ASSEMBL Y , 00045
(incl. 65, 66) 1
30 800–315
TIP ASSEMBL Y , 15045
(incl. 65, 67) 1
31 800–316
TIP ASSEMBL Y , 25045
(incl. 65, 68) 1
32 800–317
TIP ASSEMBL Y , 40045
(incl. 65, 69) 1
REF P
ART
NO. NO. DESCRIPTION QTY
33
PUMP ASSEMBL Y
(see page 20) 1
34 156–082
O–RING, Quick Coupler 3/8 2
35 154–594
O–RING, Quick Coupler 1/4 1
36 801–022 SCREW
, Cap, hex hd.
5/16–18 x 3/4 4
37 802–363
LABEL, Caution 1
38 181–867
LABEL, W arning 1
39 803–158
ENGINE, 1 1 hp, Honda OHV 1
40 803–526 SPACER 1
41 801–217
BUMPER, Rubber 1
42 801–559 SCREW
, Cap, hex hd. 1
43 801–285 BELT
, Drive 2
44 801–898
HUB, Engine 1
45 803–941 SHEA
VE, Engine 1
46 801–135
HUB, Pump 1
47 803–890 SHEA
VE, Pump 1
48 177–144
LABEL, Belt Guard 1
49 803–909 BASEPLA
TE, Belt Guard 1
51 111–040 NUT
, Lock 5/16–18 4
52 801–009
COUPLER, Female 1/4
(incl. 35) 1
53 801–134 W
AND, 32” 1
54 801–674
SLEEVE, 28” 1
56 803–350
GUN, Spray
(see Inst. Manual 308–51 1) 1
57 156–849
NIPPLE, Hex 3/8 1
58 801–531 SCREW
, Cap, hex hd.
3/8–16 x 7 1
59 801–504
BUMPER, Rubber 1
60 801–505 RET
AINER, Spring 1
61 801–593 SPRING 1
62 801–506 BOOT 1
63 800–564
LEG, Front 1
64 801–499 NUT
, Lock 3/8–16 1
65 801–090
QUICK COUPLER, Male 1/4 4
66 803–106 TIP
, Spray 00045 1
67 803–107 TIP
, Spray 15045 1
68 803–108 TIP
, Spray 25045 1
69 803–109 TIP
, Spray 40045 1

16 308–526
PARTS DRAWING
802–266 Gear Reducer (PRO 3515)
20 19
8
96
14
13
12
11
10
18
8
17
16
15
5
4
2
1
37
PARTS LIST
802–266 Gear Reducer (PRO 3515)
REF PART
NO. NO. DESCRIPTION QTY
1 802–350 GASKET 1
2 802–351
COVER, Mounting 1
3 802–334 SCREW
, Set 1
4 802–352
GEAR, Pump 1
5 802–353 O–RING 1
6 801–659 DIPSTICK 1
7 802–354
CASE, Mounting 1
8 100–527 W
ASHER, Lock 8
9 802–342 SCREW 4
10 802–355
SEAL, Oil 1
11 802–356
RING, Snap 1
12 802–357
RING, Snap 1
13 802–358 BEARING 1
14 802–359
GEAR, Engine 1
15 801–484 CAP
, G 3/8 BSP 1
16 802–344 O–RING 1
17 802–345
GAUGE, Sight 1
18 802–331 BOLT
, 5/16–24 x 1” 4
19 802–360 SCREW 4
20 803–278
SEAL, Oil 4

17
308–526
GEAR REDUCER SERVICE (PRO 3515)
WARNING
To reduce the risk of serious bodily injury , including fluid injection, splashing in the eyes or on the skin or injury
from moving parts, always follow the Pressure Relief Procedure W arning on page 2 before proceeding.
Replacing the O–Ring (5)
1. Remove the four bolts, lockwashers and washers.
Pull the pump and gear reducer assembly of f the
engine.
2. Drain the gear reducer oil by placing a container
under
it and removing the drain plug with a 22 mm
wrench. Replace the o–ring (16) if damaged.
3. Remove the four screws and lockwashers with a
6 mm wrench and pull the gear case of f the gear
cover.
4. Remove
the old o–ring (5). Clean the gear cover and
case surface. Lightly coat the new o–ring with
grease
and install it in the gear case.
5. Follow steps 4 through 6 under Assembling the
Gear
Reducer if this is all the service required.
Replacing the Gasket (1)
1. Follow steps 1 through 3 under Replacing the
O–Ring.
2. Using
a 4 mm wrench, loosen the setscrew and pull
the gear (4) of f the pump with a gear puller .
3. Remove
the four screws and lockwashers from the
gear cover .
4. Remove the gear cover and gasket (1) from the
pump. Clean the gear cover and pump surface.
Lightly
coat both sides of the gasket with grease and
install it on the gear cover .
5.
Follow the instructions under Assembling the Gear
Reducer if this is all the service required.
Replacing the Oil Seal (10)
NOTE: The oil seal MUST be replaced if removed.
1. Follow steps 1 and 2 under Replacing the O–Ring.
2. Pry the oil seal out of the gear case. Be careful not to
damage the gear case.
3. Wipe the inner surface of the gear case clean, then
lightly coat it with grease. Place the oil seal into the
gear case. Use a socket, placed against the surface
of the seal, to push the seal into the case until its top
surface is past the ridge in the bore.
4. Follow steps 4 through 6 under Assembling the
Gear
Reducer if this is all the service required.
Assembling the Gear Reducer
1. Make sure the gasket is properly placed on the gear
cover. Refer to step 4 under Replacing the Gasket.
Then, install the gear cover on the pump shaft.
2. Align the holes in the gear cover with the holes in the
pump. Apply low strength Loctite  (blue) on the
screw threads and secure the cover with the four
screws and lockwashers. T ighten them oppositely
and
evenly .
3. Align
the gear ’ s slot with the key on the pump shaft
and slide the gear onto the shaft, up to the pump’s
shoulder. Apply low strength Loctite  on the
setscrew threads and tighten the setscrew to lock
the
gear on the shaft.
4. Make sure the o–ring is in place. Refer to step 4
under Replacing the O–Ring. Install the gear case
on the cover, aligning the holes, and secure it with
the four screws and lockwashers. T ighten them
oppositely
and evenly .
5. Grease the engine shaft. Align the gear ’s slot with
the key on the engine shaft and slide the gear
reducer
onto the shaft, up to the engine’ s shoulder .
6. Secure the gear reducer to the engine with the four
bolts and lockwashers.

18 308–526
PARTS DRAWING
802–143 Gear Reducer (PRO 4020)
12
3
4
21
20
5
6
7
8
9
19
12
18
17
15
16
12
13
10
14
11
PARTS LIST
802–143 Gear Reducer (PRO 4020)
REF PART
NO. NO. DESCRIPTION QTY
1 802–332 O–RING 1
2 802–333
COVER, Mounting 1
3 802–334 SCREW
, Set 1
4 802–335
GEAR, Pump 1
5 802–336
GEAR, Engine 1
6 802–337
RING, Snap 1
7 802–338 BEARING 1
8 802–339
RING, Snap 1
9 802–340 GASKET 1
10 801–475 DIPSTICK 1
11 802–341
CASE, Mounting 1
12 100–527 W
ASHER, Lock 13
13 802–342 SCREW 9
14 802–343
SEAL, Oil 1
15 802–344 O–RING 1
16 801–484 CAP
, G 3/8 BSP 1
17 802–345
GAUGE, Sight 1
18 100–214 W
ASHER, Flat 4
19 802–331 BOLT
, 5/16–24 x 1” 4
20 802–346 SCREW 4
21 802–347
SEAL, Oil 4

19
308–526
GEAR REDUCER SERVICE (PRO 4020)
WARNING
To reduce the risk of serious bodily injury , including fluid injection, splashing in the eyes or on the skin or injury
from moving parts, always follow the Pressure Relief Procedure W arning on page 2 before proceeding.
Replacing the Gasket (9)
NOTE: To maintain a good seal, the gasket must be
replaced whenever the gear reducer is
disassembled.
1. Remove the four bolts, lockwashers and washers.
Pull the pump and gear reducer assembly of f the
engine.
2. Drain the gear reducer oil by placing a container
under
it and removing the drain plug with a 22 mm
wrench. Replace the o–ring (15) if damaged.
3. Remove the nine screws with a 6 mm wrench and
pull
the gear case of f the gear cover .
4. Remove the old gasket (9). Clean the gear cover
and case surface. Lightly coat the new gasket with
grease
and install it in on the gear case.
5. Follow steps 5 through 7 under Assembling the
Gear
Reducer if this is all the service required.
Replacing the Oil Seals (21)
1. Follow steps 1 through 3 under Replacing the
Gasket.
2. Loosen
the setscrew , using a 4 mm wrench, and pull
the gear (4) of f the pump with a gear puller .
3. Using a 6 mm wrench, remove the four screws.
Keep them separate from the other nine screws
removed
previously .
4. Remove the four oil seals (21) and replace them.
5. Follow steps 2 through 7 under Assembling the
Gear
Reducer if this is all the service required.
Replacing the O–Ring (1)
1. Follow the instructions under Replacing the Gasket
and Replacing the Oil Seals to disassemble the gear
reducer.
2. Pull the gear cover of f the pump and replace the
o–ring (1).
3. Follow instructions under Assembling the Gear
Reducer
if this is all the service required.
Replacing the Oil Seal (14)
NOTE: The oil seal MUST be replaced if removed.
1. Follow steps 1 and 3 under Replacing the Gasket.
2. Remove the snap ring (6) from the gear case, using
a snap ring pliers. Pull the gear and bearing.
3. Push the seal from the inside to the outside of the
gear case by placing screwdriver against the seal
and
lightly tapping it with hammer .
4. Wipe
the inner surface of the case clean, then lightly
coat it with grease. Place the oil seal into the gear
case. Use a socket, placed against the surface of
the seal, to push the seal into the case until its top
surface
is past the ridge in the bore.
5. Place the gear and bearing back into the gear case
and install the snap ring (6).
6. Follow steps 4 through 7 under Assembling the
Gear
Reducer if this is all the service required.
Assembling the Gear Reducer
1. Grease the o–ring and make sure it’ s properly
placed
on the gear cover .
2. Place the four oil seals and screws in the gear cover .
Place
the o–ring on the screw to hold it in the cover .
3. Apply low strength Loctite  (blue) on the screw
threads,
align the screws with the holes in the pump,
and tighten the screws oppositely and evenly .
4. Grease the pump shaft. Align the gear ’ s slot with the
key on the pump shaft and slide the gear onto the
shaft,
up to the pump’ s shoulder . Apply low strength
Loctite on the setscrew threads and tighten the
setscrew
to lock the gear on the shaft.
5. Make sure the gasket is in place (refer to step 4
under
Replacing the Gasket). Install the gear cover
on the case, aligning the holes, and secure it with
the nine screws and lockwashers. T ighten the
screws
evenly in a crisscross pattern.
6. Grease the engine shaft. Align the gear ’s slot with
the key on the engine shaft and slide the gear
reducer
onto the shaft, up to the engine’ s shoulder .
7. Secure
the gear reducer to the engine with the four
bolts, lockwashers and washers.

20 308–526
PARTS DRAWING
802–265 Pump Assembly, 1500 psi
14
13
12
14
1
3
2
31 33
32
34 35 36
38
39
40
41
28
42
43
15 16 17
12
18
19
20
21
22
23
24
22 45
21
44
19
18
47
48
10 9
11
52
49
51 50
37
25
26 29
27
28 30
10
9
8
7
6
5
4
11