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Graco ULTRA PLUS+ 750 Instructions-Parts List Manual

Lo-boy airless paint sprayer
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INSTRUCTIONS-PARTS LIST
This manual contains important
warnings and information.
READ AND KEEP FOR REFERENCE.
INSTRUCTIONS
120 VAC, 13.8A
ULTRA PLUS+ 750 Lo-Boy
AIRLESS PAINT SPRAYER
3000 psi (210 bar , 21 MPa) Maximum Working Pressure
Model 231–574 Series A
Complete sprayer on Lo-Boy cart with hose,
gun, RAC IV
DripLess
and SwitchTip
Related Manuals
Displacement Pump
. . . . . . . . . . . . . . . . . . . . . .
Fluid Filter
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Spray Gun
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Spray Tip
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
GRACO INC. P.O. BOX 1441 MINNEAPOLIS, MN 55440–1441
Tip Guard
307–806
307–273
307–614
308–644
http://www.graco.com
COPYRIGHT 1997, GRACO INC.
Graco Inc. is registered to I.S. EN ISO 9001
308–712
Supersedes Rev. A
First choice when
quality counts.
MODEL 231–574
Rev. B

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Summary of Contents for Graco ULTRA PLUS+ 750

  • Page 1 ....... . 308–644 GRACO INC. P.O. BOX 1441 MINNEAPOLIS, MN 55440–1441 http://www.graco.com COPYRIGHT 1997, GRACO INC. Graco Inc. is registered to I.S. EN ISO 9001...

  • Page 2: Table Of Contents

    ......Bearing Housing & Connecting Rod Replacement The Graco Warranty And Disclaimers ... .

  • Page 3: Warnings

    WARNING INJECTION HAZARD Spray from the gun, leaks or ruptured components can inject fluid into your body and cause extremely serious injury, including the need for amputation. Fluid splashed in the eyes or on the skin can also cause serious injury. Fluid injected into the skin is a serious injury.
  • Page 4 Read all instruction manuals, tags, and labels before operating the equipment. Use the equipment only for its intended purpose. If you are not sure, call your Graco distributor. Do not alter or modify this equipment. Use only genuine Graco parts.
  • Page 5 Component Identification and Function Fig. 1 Motor DC motor, 120 VAC, 13.8A, 1 phase Pressure Adjusting Knob Controls fluid outlet pressure ON/OFF Switch Power switch that controls 120 VAC main power to sprayer Drive Assembly Transfers power from DC motor to the displacement pump Fluid Filter Final filter of fluid between source and spray gun Displacement Pump...

  • Page 6: Setup

    Setup NOTE: See Fig. 3 while doing the setup. WARNING 1. Fill the packing nut/wet-cup 1/3 full with Graco Throat Seal Liquid (TSL), supplied. To reduce the risk of serious injury from static sparking, injection, or over pressurization and 2. Connect the gun, 3 ft. hose and 50 ft. hose.
  • Page 7 Setup PRESSURE ADJUSTING KNOB ON/OFF SWITCH PRESSURE PACKING NUT/ WET–CUP DRAIN VALVE FILL 1/3 FULL WITH TSL 1/4 npsm(m) FLUID OUTLET NIPPLE DO NOT INSTALL ANY SHUTOFF DEVICE HERE Fig. 3...

  • Page 8: Startup

    Startup NOTE: Flush the sprayer if this is a first-time startup. WARNING See page 11. INJECTION HAZARD The system pressure must be manually NOTE: See Fig. 5 except where noted. relieved to prevent the system from starting or spraying accidentally. Fluid under high pressure can be injected through the 1.
  • Page 9 Startup Cleaning a Clogged Tip 5. Check all fluid connections for leaks. Relieve the fluid pressure before tightening connections. WARNING 6. Install the spray tip and tip guard. Engage the gun safety latch. See Fig. 4. Install the spray tip INJECTION HAZARD according to the instructions supplied with it.

  • Page 10: Shutdown And Care

    Shutdown and Care 6. Coil the hose and hang it on the hose rack when WARNING storing it, even for overnight, to help protect the hose from kinking, abrasion, coupling damage, etc. INJECTION HAZARD To reduce the risk of serious injury, whenever you are instructed to relieve pressure, follow the Pressure Relief Procedure on page 8.

  • Page 11: Flushing

    Flushing NOTE: Several flushes are often required to thoroughly clean the system and prepare it for the next fluid to be sprayed, or to store the sprayer. Use this chart to determine the required flushing order for the fluid you are using, and then follow the procedure below for flushing.

  • Page 12: Troubleshooting

    Troubleshooting WARNING INJECTION HAZARD To reduce the risk of serious injury, whenever you are instructed to relieve pressure, follow the Pres- sure Relief Procedure on page 8. Perform all Troubleshooting procedures before disassembling the sprayer. MOTOR WON’T OPERATE TYPE OF PROBLEM WHAT TO CHECK WHAT TO DO If check is OK, go to next check...
  • Page 13 MOTOR WON’T OPERATE (Continued) TYPE OF PROBLEM WHAT TO CHECK WHAT TO DO If check is OK, go to next check When check is not OK refer to this column Follow Pressure Relief Pro- 1 . Check leads from motor to be sure they are 1.
  • Page 14 LOW OUTPUT TYPE OF PROBLEM WHAT TO CHECK WHAT TO DO If check is OK, go to next check When check is not OK refer to this column Low Output 1. Follow Pressure Relief Procedure Warn- 1. Check for worn spray tip. ing then replace tip.
  • Page 15 NO OUTPUT TYPE OF PROBLEM WHAT TO CHECK WHAT TO DO If check is OK, go to next check When check is not OK refer to this column Motor runs and pump strokes 1. Check paint supply. 1. Refill and reprime pump. 2.
  • Page 16 MOTOR IS HOT AND RUNS INTERMITTENTLY TYPE OF PROBLEM WHAT TO CHECK WHAT TO DO If check is OK, go to next check When check is not OK refer to this column Motor is hot and runs intermit- 1. Determine if sprayer was operated at high 1.

  • Page 17: Spin Test

    Spin Test motor does not spin freely, the armature is shorted and WARNING the motor must be replaced. See page 27. ELECTRIC SHOCK HAZARD Do not touch the brushes, leads, springs or brush holders while the sprayer is plugged in to reduce the risk of electric shock and serious bodily injury.

  • Page 18: General Repair Information

    General Repair Information CAUTION WARNING To reduce the risk of a pressure control malfunc- ELECTRIC SHOCK HAZARD tion: To reduce the risk of serious injury, including electric shock, DO NOT touch Always use needle nose pliers to disconnect a any moving parts or electrical parts with wire.

  • Page 19: Motor Brush Replacement

    Motor Brush Replacement NOTE: Replace the brushes when they have worn to 5. Inspect the commutator for excessive pitting, less than 1/2 in. Note that the brushes wear dif- burning or gouging. A black color on the commuta- ferently on each side of the motor, so check them tor is normal.

  • Page 20: Power Supply Cord Replacement

    a. Remove the pump connecting rod pin. CAUTION b. With the sprayer OFF, turn the pressure con- Do not run the sprayer dry for more than 30 seconds trol knob fully counterclockwise to minimum while checking the brushes to avoid damaging the pressure.

  • Page 21: On/Off Switch Replacement

    On/Off Switch Replacement (Fig. 17) 8. Powder the inside of the rubber boot (309) with WARNING talcum powder, then shake the excess out of the boot. INJECTION HAZARD To reduce the risk of serious injury, 9. Install the nut and rubber boot and tighten. whenever you are instructed to relieve pressure, follow the Pressure Relief 10.

  • Page 22: Pressure Control Replacement

    Pressure Control Replacement 3. Remove the four mounting screws and washers WARNING (302, 303, 304) from the pressure control board/ cover (301). See Fig. 19. INJECTION HAZARD To reduce the risk of serious injury, 4. Carefully remove the pressure control board/cover whenever you are instructed to relieve (301) so as not to stress the cables.
  • Page 23 Pressure Control Replacement 11. Reassemble in the reverse order; attach earth or WARNING ground wire (C), power leads (L1 and L2), the red leads to the TS terminals on the circuit board (B1), Do not attempt to adjust or calibrate the pressure the M+ and M–...

  • Page 24: Bearing Housing & Connecting Rod Replacement

    Bearing Housing and Connecting Rod Replacement (Fig. 20) 10. Align the connecting rod (68) with the crank (E) WARNING and the drive housing locating pins (G) with the bearing housing (69) holes. Push the bearing INJECTION HAZARD housing onto the drive housing or tap it into place To reduce the risk of serious injury, with a plastic mallet.
  • Page 25 Drive Housing Replacement (Fig. 21) 4. Lightly tap the lower rear of the bearing housing WARNING (69) with a plastic mallet to loosen it from the drive housing (67). Pull the assembled bearing housing INJECTION HAZARD and connecting rod straight off the drive housing. To reduce the risk of serious injury, whenever you are instructed to relieve 5.

  • Page 26: Drive Housing Replacement

    Drive Housing Replacement LIBERALLY APPLY GREASE 25,23 TORQUE TO 175 in-lb (19 N.m) Fig. 21...
  • Page 27 Motor Replacement (Fig. 22 and 23) 12. Remove the two lower screws (13) and lockwash- WARNING ers (20) and then the two upper screws (16) and lockwashers (20) from the front of the motor (73). INJECTION HAZARD To reduce the risk of serious injury, 13.

  • Page 28: Motor Replacement

    Motor Replacement DETAIL Shows position of conduit seal (29) in conduit connector (345) M– – MOTOR POWER CORD Fig. 22 LIBERALLY APPLY GREASE Fig. 23...

  • Page 29: Displacement Pump Repair

    (69) will be damaged. Be sure to tighten the locknut firmly. 5. Tighten the packing nut (216) just enough to stop leakage, but no tighter. Fill the wet-cup/packing nut 1/3 full with Graco TSL (65). Fig. 24 Installing the pump ( Fig. 25).

  • Page 30: Parts Drawing - Sprayer

    Parts Drawing – Sprayer Ultra PLUS+ 750 Lo-Boy Sprayer Model 231–574, Series A LABEL LABEL LABEL 73D* LABEL LABEL LABEL Ref 36 Ref 70 SEE PARTS ON PAGE 32 Ref 36...

  • Page 31: Parts List - Sprayer

    Parts List – Sprayer Ultra PLUS+ 750 Lo-Boy Sprayer Model 231–574, Series A NO. PART NO. DESCRIPTION NO. PART NO. DESCRIPTION 065–312 CONDUIT, electrical 0.7 ft 100–040 .PLUG specify length when ordering 162–453 NIPPLE, 1/4 npt(m) x 1/4 npsm 110–963 SCREW, serrated flange, hex hd, 220–369...

  • Page 32: Parts Drawing - Pressure Control

    Parts Drawing – Pressure Control Parts List – Pressure Control Basic Pressure Control for the ULTRA) PLUS+ 750 Sprayers PART NO. DESCRIPTION PART NO. DESCRIPTION 108–358 SEAL, shaft 239–042 BOARD, pressure control 112–768 KNOB, control 107–251 SCREW,panhead, 10–24 x 1” 185–565 LABEL, knob 112–610...

  • Page 33: Wiring Diagram

    Wiring Diagram PRESSURE CONTROL BOARD/COVER 236–346 ON/OFF SWITCH CIRCUIT PRESSURE BOARD TRANSDUCER (B1) POTENTIOMETER TP1 (behind) TP4 (behind) BROWN (L1) BLUE (L2) BLACK/WHITE FILTER BOARD BLACK M – BLUE(L2) BLUE – + BLACK M – GREEN/YELLOW GROUND GREEN/YELLOW WIRE MOTOR BROWN WINDINGS POWER SUPPLY CORD...

  • Page 34: Accessories

    159–100 RETAINER 161–377 SCREEN ing shows the best placement of these labels for 159–101 NUT good visibility. Order the labels directly from Graco, free of SUCTION TUBE KIT 208–920 charge. Toll Free: 1–800–328–0211 5 gallon (19 liter) size Apply other...
  • Page 35 Notes...

  • Page 36: Graco Phone Number

    Graco distributor to the original purchaser for use. With the exception of any special extended or limited warranty published by Graco, Graco will, for a period of twelve months from the date of sale, repair or replace any part of the equipment determined by Graco to be defective.

This manual is also suitable for:

231-574

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