Graco 3A1494D User Manual
Repair Instructions
LD Oil Pump Repair
Kits
Instructions for repairing the LD Oil Pump.
Maximum Fluid Pressure - 750 psi (5.17 MPa, 51.7 bar)
Maximum Air Pressure - 150 psi (1.03 MPa, 10.3 bar)
Important Safety Instructions
Read all warnings and instructions in this manual
and in your LD Series Oil or Grease Pump manual. Save all instructions.
3A1494D
EN
Repair Kits:
24H853: Throat and Piston Seal Replacement Kit
24K293: O-Ring Replacement Kit for 3:1 pumps
24H855: O-Ring Replacement Kit for 5:1 pumps
24U230: Air Piston Replacement Kit
Warnings
Warnings
The following warnings are for the setup, use, grounding, maintenance, and repair of this equipment. The exclamation point symbol alerts you to a general warning and the hazard symbols refer to procedure-specific risks. When
these symbols appear in the body of this manual, refer back to these Warnings. Product-specific hazard symbols and
warnings not covered in this section may appear throughout the body of this manual where applicable.
WARNING
SKIN INJECTION HAZARD
High-pressure fluid from dispense valve, 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 dispense valve at anyone or at any part of the body.
• Do not put your hand over the end of the dispense nozzle.
• Do not stop or deflect leaks with your hand, body, glove, or rag.
• 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 and couplings daily. Replace worn or damaged parts immediately.
PRESSURIZED ALUMINUM PARTS HAZARD
Use of fluids that are incompatible with aluminum in pressurized equipment can cause serious chemical
reaction and equipment rupture. Failure to follow this warning can result in death, serious injury, or
property damage.
• Do not use 1,1,1-trichloroethane, methylene chloride, other halogenated hydrocarbon solvents or
fluids containing such solvents.
• Many other fluids may contain chemicals that can react with aluminum. Contact your material supplier
for compatibility.
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, hearing loss, inhalation of
toxic fumes, and burns. This equipment includes but is not limited to:
• Protective eyewear, and hearing protection.
• Respirators, protective clothing, and gloves as recommended by the fluid and solvent manufacturer.
2 3A1494D
Instructions
1
Always use all new parts included in your kit and dispose of replaced parts according to all state and local
regulations for disposal of discarded components.
Inspect all parts when disassembling the pump. Replace
any and all worn and damaged parts.
Instructions
1. Stop the pump. Follow Pressure Relief Procedure,
page 3.
Pressure Relief Procedure
The equipment stays pressurized until pressure is manually
relieved. To reduce the risk of serious injury from pressurized fluid, fluid from the valve, or splashing fluid, follow the
procedure whenever you:
• are instructed to relieve pressure
• stop dispensing
• check, clean, or service any system equipment
• install or clean dispensing devices.
1. Close the pump’s bleed-type master air valve.
2. Close the pump air regulator and disconnect the air
supply hose.
3. Open the dispensing valve and dispense fluid into a
waste bucket/container until pressure is fully
relieved.
If you suspect that the dispensing valve is clogged, or
that pressure has not been fully relieved after following
the steps above, very slowly loosen the dispensing
valve coupler or hose end coupling to relieve pressure
gradually, then loosen completely.
2. Disconnect and remove the pump from its installed
location.
3. Clamp the pump (1) horizontally in a vise as shown
in Fig. 1.
NOTICE
Take care to only use enough clamping force to hold
the pump in position. The pump cylinder is aluminum and could be damaged by using excessive
clamping force.
Fig. 1
Disassembly
The following disassembly instructions describe the procedure for completely disassembling the LD oil pump.
Depending on the repair/maintenance procedure you
are performing on the pump, it may not be necessary to
entirely disassemble the pump or perform all steps in
this procedure.
The reference numbers used in the following instructions correspond to the reference numbers used in the
LD Series Oil and Grease Pump instruction manual.
3A1494D 3
Instructions
28
32
32
43
38
27
25
4. Secure a strap wrench around the fluid cylinder (32)
and a large adjustable wrench on the intake valve
housing (28). Turn the adjustable wrench counter
clockwise to loosen and remove the valve housing
(28) from the fluid cylinder (32) (Fig. 2).
NOTE: After a few turns, the valve housing should
be loose enough to finish loosening it with your
hand to remove this part.
Fig. 2
6. Using a 10 mm socket wrench, remove the 4 screws
(43) from the air valve (38) and completely remove
air valve assembly from air cylinder (27). Also
remove the two cover gaskets (25). If you are
replacing these parts, discard gaskets. (Fig. 4).
Fig. 4
5. Secure a strap wrench around the fluid cylinder
(32). Use the strap wrench to turn the fluid cylinder
counter-clockwise to loosen and remove it from the
flange (29) (Fig. 3).
NOTE: After a few turns, the fluid cylinder should be
loose enough to finish loosening it with your hand to
remove this part.
Fig. 3
Repair and replacement instructions for the Air
Valve are included in a separate repair manual
included with the kit:
• Air Valve Replacement Kit - 24H848, 24H849,
24H850
• Air Valve Repair Kit - 24H798
• Air Motor Service Kit - 24J757, 24J758, 24J759
• Pilot Valve Kit - 24H749
• Air Valve Seal Kit - 24H851
• Air Valve End Cap Kit - 24H852
4 3A1494D
Instructions
4
29
30
6
30
21
29
33
34
18
19
21
29
30
33
55
7. Using a 10 mm socket wrench, remove the 5 screws
(4) from the flange (29). Using your hand, firmly
grasp the end of the displacement rod (30) and
remove the entire assembly from the air cylinder
(27) (Fig. 5).
NOTE: Sliding the flat blade of a screw driver
between the flange (29) and air cylinder (27) will
help separate the two parts. Exercise caution, however, to not damage the o-ring (6).
9. Lay the flange assembly on a hard, clean work surface. Use an adjustable wrench to hold the displacement rod (30) securely in place. Use a 13 mm
wrench to loosen bolt (18). Remove bolt (18) and
washer (19) (Fig. 6 and Fig. 7).
NOTE: Do not use a hex wrench on the oil piston
(33) or ball holder (34) to loosen or tighten. Using a
hex wrench on this part could cause the pin (10)
(Fig. 7) to fail.
Fig. 5
8. Remove the air cylinder (27) from the vise.
Fig. 6
10. Pull the air piston (21) and o-ring (55) off the displacement rod (30).
11. Pull the displacement rod (30) out of flange housing
(29).
Fig. 7
3A1494D 5
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