Graco RentalPro 360G 255667 Operating instructions

Graco Inc. P.O. Box 1441 Minneapolis, MN 55440-1441
Copyright 2005, Graco Inc. is registered to I.S. EN ISO 9001
312520A
Repair
RentalPro 360G
255667, Airless Sprayers
Korean patent: 10-0647761
- For Portable Airless Spraying of Architectural Coatings and Paints -
3300 psi (22.8 MPa, 228 bar) Maximum Working Pressure
Important Safety Instructions
Read all warnings and instructions in
this manual. Save these instructions.
ti10809a
Related Manuals
312521 311861
310894 309640

Manual Conventions
2312520A
Contents
WARNING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Bearing Housing and Connecting Rod . . . . . . . . . 8
Drive Housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Pinion Assembly/Clutch Armature/Clamp . . . . . . 10
Clutch Housing . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Pressure Control . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Displacement Pump . . . . . . . . . . . . . . . . . . . . . . . 15
Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Parts Drawing and List - Pinion Housing, Drive
Housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Pressure Control and Filter Parts Drawing . . . . . 22
Pressure Control and Filter Parts List . . . . . . . . . 23
Parts - Sprayers, RAC™X Tip, Gun & Hose . . . . . 24
Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Graco Standard Warranty . . . . . . . . . . . . . . . . . . . 26
Manual Conventions
Note
WARNING
WARNING: a potentially hazardous situation which, if
not avoided, could result in death or serious injury.
Warnings in the instructions usually include a symbol
indicating the hazard. Read the general Warnings
section for additional safety information.
Hazard Symbol
CAUTION
CAUTION: a potentially hazardous situation which, if
not avoided, may result in property damage or
destruction of equipment.
Additional helpful information.

Warning
312520A 3
Warning
The following are general warnings related to the setup, use, maintenance and repair of this equipment. Additional,
more specific, warnings may be found throughout the text of this manual, where applicable.
WARNING
FIRE AND EXPLOSION HAZARD
Flammable fumes, such as solvent and paint fumes, in work area can ignite or explode. To help prevent
fire and explosion:
• Use equipment only in well ventilated area.
• Do not fill fuel tank while engine is running or hot; shut off engine and let it cool. Fuel is flammable
and can ignite or explode if spilled on hot surface.
• When flammable liquid is sprayed or used for flushing or cleaning, keep sprayer at least 20 feet (6 m)
away from explosive vapors.
• Eliminate all ignition sources; such as pilot lights, cigarettes, portable electric lamps, and plastic drop
cloths (potential static arc).
• Keep work area free of debris, including solvent, rags and gasoline.
• Do not plug or unplug power cords, or turn power or light switches on or off when flammable fumes
are present.
• Ground equipment and conductive objects in work area. See Grounding instructions.
• Use only grounded hoses.
• Hold gun firmly to side of grounded pail when triggering into pail.
• If there is static sparking or you feel a shock, stop operation immediately. Do not use equipment
until you identify and correct the problem.
SKIN INJECTION HAZARD
High-pressure fluid from gun, hose leaks, or ruptured components will pierce skin. This may look like just
a cut, but it is a serious injury that can result in amputation. Get immediate surgical treatment.
• Do not point gun at anyone or at any part of the body.
• Do not put your hand over the spray tip.
• Do not stop or deflect leaks with your hand, body, glove, or rag.
• Do not spray without tip guard and trigger guard installed.
• Engage trigger lock when not spraying.
• Follow Pressure Relief Procedure in this manual, when you stop spraying and before cleaning,
checking, or servicing equipment.
PRESSURIZED EQUIPMENT HAZARD
Fluid from the gun/dispense valve, leaks, or ruptured components can splash in the eyes or on skin and
cause serious injury.
• Follow Pressure Relief Procedure in this manual, when you stop spraying and before cleaning,
checking, or servicing equipment.
• Tighten all fluid connections before operating the equipment.
• Check hoses, tubes, and couplings daily. Replace worn or damaged parts immediately.
MOVING PARTS HAZARD
Moving parts can pinch or amputate fingers and other body parts.
• Keep clear of moving parts.
• Do not operate equipment with protective guards or covers removed.
• Pressurized equipment can start without warning. Before checking, moving, or servicing equipment,
follow the Pressure Relief Procedure in this manual. Disconnect power or air supply.

Warning
4312520A
EQUIPMENT MISUSE HAZARD
Misuse can cause death or serious injury.
• Do not exceed the maximum working pressure or temperature rating of the lowest rated system
component. See Technical Data in all equipment manuals.
• Use fluids and solvents that are compatible with equipment wetted parts. See Technical Data in all
equipment manuals. Read fluid and solvent manufacturer’s warnings.
• Check equipment daily. Repair or replace worn or damaged parts immediately.
• Do not alter or modify equipment.
• Do not install a shut-off device between filter outlet and gun.
• Use equipment only for its intended purpose. Call your Graco distributor for information.
• Route hoses and cables away from traffic areas, sharp edges, moving parts, and hot surfaces.
• Do not use hoses to pull equipment.
• Keep children and animals away from work area.
• Comply with all applicable safety regulations.
PRESSURIZED ALUMINUM PARTS HAZARD
Do not use 1,1,1-trichloroethane, methylene chloride, other halogenated hydrocarbon solvents or fluids
containing such solvents in pressurized aluminum equipment. Such use can cause serious chemical
reaction and equipment rupture, and result in death, serious injury, and property damage.
SUCTION HAZARD
Never place hands near the pump fluid inlet when pump is operating or pressurized. Powerful suction
could cause serious injury.
CARBON MONOXIDE HAZARD
Exhaust contains poisonous carbon monoxide, which is colorless and odorless. Breathing carbon mon-
oxide can cause death. Do not operate in an enclosed area.
TOXIC FLUID OR FUMES HAZARD
Toxic fluids or fumes can cause serious injury or death if splashed in the eyes or on skin, inhaled, or
swallowed.
• Read MSDS’s to know the specific hazards of the fluids you are using.
• Store hazardous fluid in approved containers, and dispose of it according to applicable guidelines.
BURN HAZARD
Equipment surfaces and fluid that’s heated can become very hot during operation. To avoid severe
burns, do not touch hot fluid or equipment. Wait until equipment/fluid has cooled completely.
PERSONAL PROTECTIVE EQUIPMENT
You must wear appropriate protective equipment when operating, servicing, or when in the operating
area of the equipment to help protect you from serious injury, including eye injury, inhalation of toxic
fumes, burns, and hearing loss. This equipment includes but is not limited to:
• Protective eyewear
• Clothing and respirator as recommended by the fluid and solvent manufacturer
•Gloves
• Hearing protection
RECOIL HAZARD
Brace yourself; gun may recoil when triggered and cause you to fall, which could cause serious injury.
WARNING

Maintenance
312520A 5
Maintenance
Pressure Relief Procedure
1. Lock gun trigger safety.
2. Turn engine ON/OFF switch to OFF.
3. Move pump switch to OFF and turn pressure control knob
fully counterclockwise.
4. Unlock trigger safety. Hold metal part of gun firmly to side
of grounded metal pail, and trigger gun to relieve
pressure.
5. Lock gun trigger safety.
6. Open pressure drain valve. Leave valve open until ready
to spray again.
If you suspect that the spray tip or hose is completely
clogged, or that pressure has not been fully relieved
after following the steps above, VERY SLOWLY loosen
tip guard retaining nut or hose end coupling to relieve
pressure gradually, then loosen completely. Now clear
tip or hose.
Sendec Hour Meter
A Sendec Hour Meter has been installed on the rental
washer to monitor the number of hours the rental
washer has been used. After 25 hours the display will
begin to flash and the message “change oil” will display.
Reset meter using reset key or a magnet.
Maintenance Chart
SPARK PLUG: Use only BPR6ES (NGK) or W20EPR-U
(NIPPONDENSO) plug. Gap plug to 0.028 to 0.031 in.
(0.7 to 0.8 mm). Use spark plug wrench when installing
and removing plug.
Premium Sprayers Engine Oil Funnel:
Use the supplied engine oil funnel when draining oil.
WARNING
Read Injection Hazard, page 3; Burn Hazard, page 4
CAUTION
For detailed engine maintenance and specifications,
refer to separate Honda Engines Owner's Manual,
supplied.
ti10869a
Interval What to do
Daily Check engine oil level and fill as necessary.
Check hose for wear and damage.
Check that all hose fittings are secure.
Check gun safety for proper operation.
Check pressure drain valve for proper operation.
Check and fill the gas tank.
Check level of TSL in displacement pump packing
nut. Fill nut, if necessary. Keep TSL in nut to help
prevent fluid buildup on piston rod and premature
wear of packings and pump corrosion.
After the first
20 hours of
operation
Drain engine oil and refill with clean oil. Reference
Honda Engines Owner’s Manual for correct oil vis-
cosity.
After each 50
hours of
operation
Replace pump. See pump manual 310894.
Weekly Remove engine air filter cover and clean element.
Replace element, if necessary. If operating in an
unusually dusty environment: check filter daily and
replace, if necessary.
Replacement elements can be purchased from
your local HONDA dealer.
After each
100 hours of
operation
Change engine oil. Reference Honda Engines
Owner’s Manual for correct oil viscosity.

Troubleshooting
6312520A
Troubleshooting
Problem Cause Solution
Engine will not start Engine switch is OFF Turn engine switch ON
Engine is out of gasoline Refill gas tank. Honda Engines Owner's
Manual.
Engine oil level is low Try to start engine. Replenish oil, if neces-
sary. Honda Engines Owner's Manual.
Spark plug is disconnected or dam-
aged
Connect spark plug cable or replace spark
plug
Cold engine Use choke
Fuel shutoff lever is OFF Move lever to ON position
Oil is seeping into combustion cham-
ber
Remove spark plug. Pull starter 3 to 4
times. Clean or replace spark plug. Start
engine. Keep sprayer upright to avoid oil
seepage
False tripping of WatchDog sys-
tem. Pump does not run.
Operating conditions out of Watch-
Dog parameters
Pump output is low, page 7.
Turn pressure down. Contact Graco Techni-
cal Assistance to adjust WatchDog parame-
ters. Operate without WatchDog active;
Manual 310892.
Engine operates, but displacement
pump does not operate
Error code displayed Reference Pressure Control repair, page 13
in manual 312521.
Pump switch is OFF Turn pump switch ON
Pressure setting too low Turn pressure adjusting knob clockwise to
increase pressure.
Fluid filter (56) is dirty Clean filter. Page 22
in manual 312521.
Tip or tip filter is clogged Clean tip or tip filter. Manual 311861.
Displacement pump piston rod is
stuck due to dried paint
Repair pump. Manual 310894.
Connecting rod is worn or damaged Replace connecting rod. Page 8 in manual
312521.
Drive housing is worn or damaged Replace drive housing. Page 9 in manual
312521.
Electrical power is not energizing
clutch field
Check wiring connections. Page 12 in manual
312521.
Reference wiring diagram. Page 23 in manual
312521.
With pump switch ON and pressure turned to MAX-
IMUM, use a test light to check for power between
clutch test points on control board.
Remove clutch wires from control board
and measure resistance across clutch coil.
At 70° F, the resistance must be between
1.2 +0.2Ω; if not, replace pinion housing.
Have pressure control checked by autho-
rized Graco dealer
Clutch is worn, damaged, or incor-
rectly positioned
Adjust or replace clutch. Page 10
in manual
312521.
Pinion assembly is worn or damaged Repair or replace pinion assembly. Page10 in
manual 312521.

Troubleshooting
312520A 7
Problem Cause Solution
Pump output is low Strainer (82) is clogged Clean strainer.
Piston ball is not seating Service piston ball. Manual 310894.
Piston packings are worn or damaged Replace packings. Manual 310894.
O-ring in pump is worn or damaged Replace o-ring. Manual 310894.
Intake valve ball is not seating properly Clean intake valve. Manual 310894.
Intake valve ball is packed with material Clean intake valve. Manual 310894.
Engine speed is too low
Increase throttle setting. Manual 312521.
Clutch is worn or damaged Adjust or replace clutch. Page 10 in manual
312521.
Pressure setting is too low Increase pressure. Manual 312521.
Fluid filter (56), tip filter or tip is clogged or
dirty
Clean filter. Manual 312521 or 311861.
Large pressure drop in hose with heavy
materials
Use larger diameter hose and/or reduce
overall length of hose. Use of more than
100 ft of 1/4 in. hose significantly reduces
performance of sprayer. Use 3/8 in. hose
for optimum performance (50 ft minimum).
Excessive paint leakage into throat
packing nut
Throat packing nut is loose Remove throat packing nut spacer. Tighten
throat packing nut just enough to stop leak-
age.
Throat packings are worn or damaged Replace packings. Manual 310894.
Displacement rod is worn or damaged Replace rod. Manual 310894.
Fluid is spitting from gun Air in pump or hose
Check and tighten all fluid connections. Rep-
rime pump. Manual 312521.
Tip is partially clogged Clear tip. Manual 311861.
Fluid supply is low or empty Refill fluid supply. Prime pump. Manual
312521. Check fluid supply often to prevent
running pump dry.
Pump is difficult to prime Air in pump or hose
Check and tighten all fluid connections.
Reduce engine speed and cycle pump as
slowly as possible during priming.
Intake valve is leaking Clean intake valve. Be sure ball seat is not
nicked or worn and that ball seats well.
Reassemble valve.
Pump packings are worn
Replace pump packings. Manual 310894.
Paint is too thick Thin the paint according to the supplier's
recommendations
Engine speed is too high Decrease throttle setting before priming
pump. Manual 312521.
Clutch squeaks each time clutch
engages
Clutch surfaces are not matched to each other
when new and may cause noise
Clutch surfaces need to wear into each
other. Noise will dissipate after a day of run
time.
High engine speed at no load Misadjusted throttle setting Reset throttle to 3300 engine rpm at no
load.
Worn engine governor Replace or service engine governor
Hour Meter flashing “CHG OIL” Unit requires service See maintenance chart for scheduled
maintenance interval on page 5.

Bearing Housing and Connecting Rod
8312520A
Bearing Housing and Connecting Rod
Removal
1. Relieve pressure; page 5.
2. FIG. 1. Remove four screws (45) and front cover (44)
3. Remove pump. Refer to Displacement Pump, Removal,
page 15.
4. Remove four screws (41) and washers (42) from bearing
housing (40).
5. Pull connecting rod (43) and lightly tap lower rear of
bearing housing with plastic mallet to loosen from drive
housing (33). Pull bearing housing and connecting rod
assembly off drive housing.
6. Inspect crank (B) and connecting rod (43) for excessive
wear and replace parts as needed.
Installation
1. Evenly lubricate inside of bronze bearing (C) in bearing
housing (40) with high-quality motor oil. Liberally pack top
roller bearing (E), lower bearing (D) inside connecting rod
(43) with bearing grease.
2. Assemble connecting rod (43) to bearing housing (40).
Rotate connecting rod to lowest position.
3. Clean mating surfaces of bearing and drive housings.
4. Align connecting rod with crank (B) and carefully align
locating pins (F) in drive housing (33) with holes in
bearing housing (40). Push bearing housing onto drive
housing or tap into place with plastic mallet.
5. Install screws (41) and washers (42) in bearing housing.
Torque evenly to note 3 value in Fig. 1.
6. Install pump. Refer to Displacement Pump, Installation,
page 14.
WARNING
Read Injection Hazard, page 3; Burn Hazard, page 4
CAUTION
DO NOT use bearing housing screws (41) to align or
seat bearing housing with drive housing. Align these
parts with locating pins, to avoid premature bearing
wear.
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Drive Housing
312520A 9
Drive Housing
Removal
1. Relieve pressure; page 5.
2. Remove bearing housing. Refer to Bearing Housing and
Connecting Rod, Removal, page 8.
3. Remove six screws (38).
4. Lightly tap around drive housing (33) to loosen drive
housing. Pull drive housing straight off pinion housing. Be
prepared to support combination gear (32) which may
also come out.
Installation
1. FIG. 2 . Apply all grease supplied with replacement gear
cluster to gear teeth and to areas called out by note 3.
2. FIG. 3. Ensure thrust washers (30, 31, 72) are on
combination gear (32) and washers (Fig. 2; 33a, 33b) are
on crankshaft of drive housing (33) as shown.
3. Clean mating surfaces of pinion and drive housings.
4. Align gears and push new drive housing straight onto
pinion housing (29) and locating pins (B).
5. Install six screws (38).
6. Install bearing housing. Refer to Bearing Housing and
Connecting Rod, Installation, page 8.
7. Install screws (38) in drive housing. Torque evenly to note
3 value in FIG. 2.
8. Install pump. Refer to Displacement Pump, Installation,
page14.
FIG. 3
WARNING
Read Injection Hazard, page 3; Burn Hazard, page 4
CAUTION
Thrust washers may stick to grease inside of drive housing.
Do not lose or misplace.
CAUTION
DO NOT use drive housing screws (38) to align or seat
drive housing with pinion housing. Align these parts with
locating pins, to avoid premature bearing wear.
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Torque to 140 ±10 in-lb (15.8 ±1.1N.m)
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Pinion Assembly/Clutch Armature/Clamp
10 312520A
Pinion Assembly/Clutch Armature/Clamp
Pinion Assembly/Clutch Armature Removal
Pinion Assembly
If pinion assembly (29) is not removed from clutch housing
(19), do 1. through 3. Otherwise, start at 4.
1. Remove drive housing; page 9.
2. FIG. 4. Disconnect clutch cable connectors from inside of
pressure control.
a. FIG. 14 . Remove two screws (71) and swing down
cover (130a).
b. Disconnect engine leads from board to engine.
c. Remove strain reliefs 130r and 123.
3. FIG. 4 . Remove four screws (36) and pinion assembly (29).
FIG. 4
4. FIG. 5. Place pinion assembly (29) on bench with rotor
side up.
5. Remove four screws (28) and lock washers (24). Install
two screws in threaded holes (E) in rotor. Alternately
tighten screws until rotor comes off.
FIG. 5
6. FIG. 6. Remove retaining ring (29b).
7. Turn pinion assembly over and tap pinion shaft (29a) out
with plastic mallet.
FIG. 6
Clutch Armature
8. FIG. 7. Use an impact wrench or wedge something
between clutch armature (25) and clutch housing to hold
engine shaft during removal.
9. Remove four screws (23) and lock washers (24).
10. Remove armature.
FIG. 7
WARNING
Read Injection Hazard, page 3; Burn Hazard, page 4
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Pinion Assembly/Clutch Armature/Clamp
312520A 11
Installation
Clutch Armature
1. FIG. 8. Lay two stacks of two dimes on smooth bench
surface.
2. Lay armature (25) on two stacks of dimes.
3. Press center of hub (26) down to bench surface.
FIG. 8
4. Install armature (25) on engine drive shaft.
5. Install four screws (23) and lock washers (24) with torque
of 125 in-lb.
Pinion Assembly
6. FIG. 6. Check o-ring (29d) and replace if missing or
damaged.
7. Tap pinion shaft (29a) in with plastic mallet.
8. Install retaining ring (29b) with beveled side facing up.
9. FIG. 5. Place pinion assembly on bench with rotor side up.
10. Apply Loctite®to screws. Install four screws (28) and lock
washers (24). Alternately torque screws to 125 in-lb until
rotor is secure. Use threaded holes to hold rotor.
11. FIG. 4. Install pinion assembly (29) with four screws (36)
and washers (37).
12. FIG. 14. Connect clutch cable connectors to inside of
pressure control.
Clamp Removal
1. Do Engine Removal.
2. Drain gasoline from tank according to Honda manual.
3. FIG. 9 . Tip engine on side so gas tank is down and air
cleaner is up.
4. FIG. 10. Loosen two screws (24) on clamp (22),
5. Push screwdriver into slot in clamp (22) and remove
clamp.
FIG. 9
Clamp Installation
1. FIG. 10. Install engine shaft key (18)
2. Tap clamp (22) onto engine shaft (A). Maintain dimension
shown note 2. Chamfer must face engine.
3. Check dimension: Place rigid, straight steel bar (B) across
face of clutch housing (19). Use accurate measuring
device to measure distance between bar and face of
clamp. Adjust clamp as necessary. Torque two screws
(24) to 125 ±10 in-lb (14 ±1.1 N·m)
Face of clutch housing
1.550 ± 0.010 in. (39.37 ± 0.25 mm)
Torque to 125 ± 0.10 in-lb (14 ±1.1 N·m)
Chamfer this side
FIG. 10
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WARNING
Gasoline can spill and cause a fire or explosion if
engine is tipped on side.
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Clutch Housing
12 312520A
Clutch Housing
Removal
1. FIG. 11. Remove four screws (20) and lock washers (21)
which hold clutch housing (19) to engine.
2. Remove screw (35) from under mounting plate (D).
3. Pull off clutch housing (19).
Installation
1. FIG. 11. Push on clutch housing (19).
2. Install four capscrews (20) and lock washers (21) and
secure clutch housing (19) to engine. Torque to 200 in-lb
(22.6 N·m).
3. Install screw (35) from beneath mounting plate (D).
Torque to 26 ft-lb (35.2 N·m).
FIG. 11
Engine
Removal
NOTE: All service to the engine must be performed by
an authorized HONDA dealer.
1. Remove Pinion Assembly/Clutch Armature/Clamp and
Clutch Housing, as instructed on pages 9, 10 and 11.
2. FIG. 12. Disconnect all necessary wiring.
3. FIG. 13. Remove two locknuts (17) and screws (16) from
base of engine.
4. Lift engine carefully and place on work bench.
FIG. 12
FIG. 13
Installation
1. Lift engine carefully and place on cart.
2. FIG. 13. Install two screws (16) in base of engine and
secure with locknuts (17). Torque to 26 ft-lb (22.6 N·m).
3. FIG. 12. Connect all necessary wiring.
4. Install Pinion Assembly/Clutch Armature/Clamp and
Clutch Housing, as instructed on pages 9 and 10 and 11.
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Pressure Control
312520A 13
Pressure Control
Pump ON/OFF Switch
Removal
1. FIG. 14. Remove two screws (71) and swing down
cover (130a).
2. Disconnect pump ON/OFF switch (130f) connector from
control board.
3. Press in on two retaining tabs on each side of pump
ON/OFF switch (130f) and remove switch from cover.
Installation
1. Install new pump ON/OFF switch (130f) so tabs of switch
snap into place on inside of cover.
2. Connect pump ON/OFF switch connector to control
board.
3. Swing up cover (130a) and secure with two screws (71).
FIG. 14
WARNING
Read Injection Hazard, page 3; Burn Hazard, page 4
GROUND 129
130a
123
CLUTCH
130b
66
130d
130e
72
67
66
113
130d
130h
71
130j
130f
130a
130g
130g
130f
130c
CLUTCH (+)
CLUTCH (-)
ti5488b

Pressure Control
14 312520A
Control Board
Removal
1. FIG. 14. Remove two screws (71) and swing down
cover (130a)
2. Remove strain relief bushings (130r and 123).
3. Disconnect at control board (130b):
• Lead from potentiometer (130d)
• Lead from transducer (66)
• Lead from WatchDog switch (130g)
• Lead from pump ON/OFF switch (130f)
• Display connector (130m)
• Engine, ground and clutch wires
4. Remove four screws (130c) and control board (130b).
Installation
1. FIG. 14 . Install control board (130b) with four screws (130c).
2. Connect engine wires to control board (130b).
3. Connect at control board (130b):
• Ground and clutch wires
• Display connector (130m)
• Lead from pump ON/OFF switch (130f)
• Lead from WatchDog switch (130g)
• Lead from transducer (66)
• Lead from potentiometer (130d)
4. Install new strain relief bushings (123 and 130r).
5. Swing up cover (130a) and secure with two screws (71).
Pressure Control Transducer
Removal
1. FIG. 14. Remove two screws (71) and swing down
cover (130a)
2. Disconnect transducer (66) lead from control board
(130b).
3. Pull transducer connector through rubber grommet (113).
4. Remove pressure control transducer (66) and o-ring (67)
from filter housing (72).
Installation
1. FIG. 14. Install o-ring (67) and pressure control transducer
(66) in filter housing (72). Torque to 35 - 45 ft-lb.
2. Install transducer connector and rubber grommet in
control housing.
3. Connect transducer (66) lead to control board (130b).
4. Swing up cover (130a) and secure with two screws (71).
Pressure Adjust Potentiometer
Removal
1. FIG. 14. Remove two screws (71) and swing down
cover (130a)
2. Disconnect potentiometer (130d) lead from control board
(130b).
3. Loosen set screws on potentiometer knob (130h) and remove
knob, shaft nut, lock washer and potentiometer (130d).
4. Remove shaft spacer (130e) from potentiometer.
Installation
1. Install shaft spacer (130e) on potentiometer (130d).
2. FIG. 14. Install potentiometer, shaft nut, lock washer and
potentiometer knob (130h).
a.Turn potentiometer shaft clockwise to internal stop.
Assemble potentiometer knob (130h) to strike pin on
cover (130a).
b.After adjustment of step a., tighten both set screws in
knob 1/4 to 3/8 turn after contact with shaft.
3. Connect potentiometer lead to control board (130b).
4. Swing up cover (130a) and secure with two screws (71).
WARNING
Read Injection Hazard, page 3; Burn Hazard, page 4
WARNING
Read Injection Hazard, page 3; Burn Hazard, page 4
WARNING
Read Injection Hazard, page 3; Burn Hazard, page 4

Displacement Pump
312520A 15
Displacement Pump
Removal
1. Flush pump.
2. Stop pump with piston rod in its lowest position.
3. Do Pressure Relief, page 5.
4. Separate drain hose from sprayer
FIG. 15
5. Disconnect paint hose from pump.
FIG. 16
6. Raise latch lock. Push latch open.
FIG. 17
7. FIG. 18. Ratchet open pump door.
a. Ratchet pump door forward.
FIG. 18
b. Twist latch u-bolt out of pump door recess.
c. Place u-bolt on pump door outer edge.
d. If pump door is stuck, do steps e., f. and 8., otherwise
go to step 9.
FIG. 19
WARNING
Read Injection Hazard, page 3; Burn Hazard, page 4
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WLD
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WLD

Displacement Pump
16 312520A
e. Twist latch u-bolt back from pump door outer edge
f. Place u-bolt on pump door protrusion
FIG. 20
8. Ratchet pump door forward.
FIG. 21
9. Open pump door.
FIG. 22
10. FIG. 23. Pull out pump pin and place in pin holder
FIG. 23
Installation
1. FIG. 24. Adjust piston rod with pin holder to pull out piston
rod. Tap piston rod on hard surface to push in piston rod.
2. Push pump collar flush with bearing housing ledge to be
able to close pump door.
FIG. 24
3. FIG. 25 . Slide pump into connecting rod. Push pump pin until it
is fully retained.
Note: Pin will snap into position.
FIG. 25
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Displacement Pump
312520A 17
4. FIG. 26. Close pump door and rotate latch into position.
Do not tighten latch.
5. FIG. 26. Rotate pump to align with paint hose. Connect
paint hose and hand tighten to 70 in-lb
FIG. 26
6. FIG. 27 . Tighten latch and rotate latch lock into locked position.
FIG. 27
7. FIG. 28. Attach drain hose to sprayer.
FIG. 28
8. FIG. 29. Fill pump with Graco TSL until fluid flows onto top
of seal.
FIG. 29
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Displacement Pump
18 312520A

Parts
312520A 19
Parts
Parts Drawing
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Parts
20 312520A
Parts List
Ref Part Description Qty
1 287411 FRAME, cart 1
2 156306 WASHER, flat 2
3 119420 WHEEL, pneumatic 2
4 15E891 CLIP, retaining 2
5 192027 SLEEVE, cart 2
6 183350 WASHER 2
7 108068 PIN, spring straight 2
8 109032 SCREW, mach, pnh 4
8a 100020 WASHER, lock 4
9 112827 BUTTON, snap 2
10 245245 HANDLE, cart 1
11 237686 WIRE, ground assembly w/ clamp 1
12 112798 SCREW, thread forming, hex hd 1
14 15C871 CAP, leg 2
15 108879 ENGINE, gas, 4.0 hp 1
16 110837 SCREW, flange, hex 2
17 110838 NUT, lock 2
18 183401 KEY, parallel 1
19 15E535
HOUSING, clutch, mach 1
20 108842 SCREW, cap, hex hd 4
21 100214 WASHER, lock 4
22 193680 COLLAR, shaft 1
23† 108803 SCREW, hex, socket head 6
24† 105510 WASHER, lock, spring (hi-collar) 10
25† ARMATURE, clutch, 4in. 1
26† HUB, armature 1
27† ROTOR, clutch, 4 in. 1
28† 101682 SCREW, cap, sch 4
29 287463 HOUSING, pinion 1
30 114672 WASHER, thrust (brass) 1
31 114699 WASHER, thrust (steel) 1
32 287653 GEAR, combination 1
33 287467 HOUSING, drive 1
35 112395 SCREW, cap, flnghd 1
36 119426 SCREW, hex washer hd 10
39* 119562 SWITCH, reed w/connector 1
40 287522
HOUSING, bearing 1
41 113467 SCREW, cap, socket hd 4
42 104008 WASHER, lock spring 4
43 287471 ROD, connecting 1
44 287521 COVER, front, includes 45 1
45 118444 SCREW, mach hex wash hd 4
47 287512 PUMP, displacement,
includes 86, 89, 90
1
67 111457 O-RING 1
68 244240 HOSE, coupled, includes 69 1
69 241920 DEFLECTOR, threaded 1
72 15F250 WASHER, thrust 1
76 114678 BUSHING, strain relief 1
82 189920 STRAINER, (1-11 1/2 npsm) 1
83 114271 STRAP, retaining 1
84 238049 FLUID, TSL, 4 oz (not shown) 1
86 15E802 FITTING, pump, quick disconnect 1
87 287419 HOSE, coupled 1
89 15E807 TUBE, INTAKE 1
90 118494 O-RING 1
99 113161 SCREW, flange, hex hd 3
107 15F109 PIN, pump 1
115 15M963 LABEL, identification 1
119 15R246 LABEL, identification 1
120▲15F638 LABEL, danger, English 1
121▲194126 LABEL, warning 1
122 290228 LABEL, caution 1
125▲195119 LABEL, warning 1
127 119569 BUSHING, strain relief 1
129 119579 CONDUCTOR, ground 1
130 287649 BOX, control 1
132 119676 SPRING, RETAINING 1
133 114687 CLIP, RETAINER 1
143 116038 WASHER, wave spring 2
164 119790 O-RING 1
165 117631 METER, hour 1
166 108868 CLAMP, wire 1
167 102478 STRAP, tie wiring 2
168 15C388 CONDUIT, corrugated 1
169 15B953 TAPE, foam, hour meter 1
▲ Replacement Danger and Warning labels, tags,
and cards are available at no cost.
† Included in Clutch Replacement Kit 241109
Ref Part Description Qty