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
Instructions
3
26
29
29
26
Pin Hole
33
20
a
29
26
3
12. Check displacement rod (30) for excessive wear or
damage. If displacement rod (30) is damaged,
replace the pump.
13. Using a 5 mm socket wrench remove the 3 screws
(3) from the bottom cover (26) (Fig. 8).
Fig. 8
14. Separate the bottom cover (26) from the flange (29)
(Fig. 8).
If you are replacing the o-rings and seals installed in
the flange, bottom cover, and air piston continue
instructions with the Throat and Piston Seal
Replacement Kit 24H853 instructions beginning on
page 9 and then Step 1, page 6 of the Reassembly
instructions.
2. Apply a thin coat of grease round the top of the displacement rod (30) and install the rod assembly in
the flange assembly as shown in Fig. 9.
Fig. 9
3. Install bottom cover (26) over displacement rod
(30). Align pilot valve (20) installed in bottom cover
with opening (a) in flange (29) as shown in Fig. 10.
Compress the bottom cover (26) and flange (29)
together.
Pump Reassembly
NOTE: The following instructions describe the proce-
dure to follow to reassemble a completely disassembled
LD oil pump. Depending on the repair/maintenance procedure you are performing on the pump, it may not be
entirely disassembled. See the specific section(s)
related to your repair/replacement kit.
For all reassembly procedures:
• Clean all the parts carefully in a compatible solvent,
and inspect for wear or damage. Use all the repair
kit parts during reassembly, and replace other parts
as necessary.
• Check the polished surfaces for scratches or wear.
• Lubricate all parts with a light, water-resistant
grease.
1. Install new o-rings and seals in bottom cover (26)
and flange (29) as described in the Throat and Piston Seal Replacement Kit 24H853, page 9. Be sure
to apply a thin coat of water-resistant grease to all
o-rings and seals.
Fig. 10
4. Install 3 screws (3) (Fig. 11). Tighten with a 5mm
socket wrench and torque to 60-70 in lbs (6.8 – 7.9
N.m).
Fig. 11
6 3A1494D
5. Install o-ring (55) in groove on the end of the dis-
30
55
21
19
18
26
27
21
26
27
placement rod (30) (Fig. 12).
Fig. 12
6. Push the air piston (21) over the end of the displacement rod (30). Apply Loctite® 262 to the bolt (18)
shoulder. Install the washer (19) and bolt (18). Hold
the displacement rod (30) with an adjustable wrench
and use an 8mm hex wrench to tighten the bolt
securely. Torque bolt to 155 - 160 in. pounds (17.5 -
18.0 N.m) (Fig. 13).
Instructions
Fig. 14
9. Remove the assembly from the vise and place the
top of the air cylinder down on a clean hard surface.
Use the palms of your hands to press the bottom
cover (26) firmly into the air cylinder (27) as shown
in Fig. 15.
NOTE: Loctite® is a registered trademark of the Loctite
Corporation.
Fig. 13
7. Install new o-ring around air piston (21), and pump
piston (33) as described in the Throat and Piston
Seal Replacement Kit 24H853, page 9. Be sure to
apply a thin coat of water-resistant grease to all
o-rings and seals.
8. Slide air cylinder (27) over the bottom cover (26)
(Fig. 14).
Fig. 15
10. Secure assembly in vise as shown in Fig. 16. Install
5 screws (4) wrench tight only.
NOTE: If installing a new air cylinder (27) the mating
holes are not threaded by design. Use thread forming screws (4) to form threads as they are being
installed. Torque to 95-105 in.-lbs (10.7 to 11.8 N.m)
to ensure full thread formation.
11. To ensure there is a proper seal between the air
valve and manifold, loosen all 5 screws (4) approximately 1/4 turn Fig. 16). These screws will be
torqued AFTER the air valve is installed (38) (Step
3A1494D 7
Instructions
4
33
43
38
27
25
21
4
32
28
15).
Fig. 16
12. Perform any air valve repairs / maintenance
needed. Instructions for these procedures are
included in the separate repair manual included with
the Air Valve repair kit.
13. Be sure seals (25) are lightly greased and installed
on air valve (38). Install air valve on air cylinder (27)
(Fig. 17).
NOTE: The air valve (38) can be installed in any
configuration. There is not just one correct way to
install these parts.
Muffler (21) Installation (Fig. 17)
Depending on your installation, the air valve (38) can be
mounted with the muffler (21) on either side of the air
valve (38).
To change the installation location:
a. Remove the 4 screws (43).
b. Remove the air valve (38) from its current
mounted position on the air cylinder (27) and
rotate the air valve 180 degrees, which will
reposition the muffler to face the other side of
the pump.
16. Install new o-rings around pump piston (33) (Fig.
16) fluid cylinder (32) and intake valve housing (28)
(Fig. 18) as described in the O-Ring Replacement
Kit 24H855 or 24K293, page 11. Be sure to apply a
thin coat of water-resistant grease to all o-rings and
seals.
17. Install the fluid cylinder (32) over the displacement
rod (3), threaded end first. Hand tighten and then
torque to 20-25 ft. lbs (27-34 N.m) (Fig. 18).
NOTE: It is not necessary to torque the fluid cylinder
in this step. Everything will be torqued simultaneously in Step 16 with the intake housing (28).
Fig. 17
14. Install screws (43). Torque to 60-70 in. lbs (6.8 - 7.9
N.m).
15. Torque bolts (4) installed in Step 10 to 60-70 in. lbs
(6.8 - 7.9 N.m).
Fig. 18
18. Install the intake valve (28) housing on the end of
the fluid cylinder (32). Hand tighten and then torque
to 20-25 ft. lbs (27-34 N.m) (Fig. 18).
8 3A1494D
Repair Kits
7
17
6
5
25
8
9
55
10
5
21
All Repairs:
• Unless otherwise stated, entirely disassemble pump
as described in the pump disassembly instruction
section of this manual.
• Properly discard all replaced parts according to
local and state regulations for disposal of discarded
components.
• Always use all new parts included in the kit to
replace the identical part on the pump.
• Grease all parts prior to reassembly with a thin coat
of lightweight grease.
Instructions
• Reassemble pump as described in the reassembly
instructions, page 6.
Throat and Piston Seal Replacement Kit -
Fig. 19
24H853 (Fig. 19)
1. Use a pick to remove the o-ring (5) installed around
NOTE: When servicing the throat and piston seals, it is
recommended to also replace seals in the pump lower.
Order repair kit: 24K293 for 3:1 pumps or 24H855 for
5:1 pumps.
Replacement parts for o-ring (5) installed on air piston
(21), o-rings and u-cup seal (6, 7, 9, and 17) installed in
bottom cover (26), o-ring (8) installed on flange (29) and
gasket (25) used later in reassembly of the air valve
(38).
O-ring (55) is installed between the air piston (21) and
displacement rod (30).
Ref. Description
5 O-RING, air piston 1
6O-RING 1
7O-RING 1
8 O-RING, wiper 1
9 SEAL, u-cup 1
10 PIN, spring 1
17 O-RING 3
25 GASKET, cover, small 2
55 O-RING 1
Qty
.
the circumference of the air piston (21) (Fig. 20).
Grease the new o-ring included in the kit and install
it around the air piston.
Fig. 20
2. Use a pick to remove o-rings (6, 7), bearing (22) and
u-cup seal (9) from the bottom cover. (Fig. 21).
Grease and replace the o-rings and u-cup seal with
the new parts included in the kit and install them in
the order shown in Fig. 21.
3A1494D 9
Instructions
26
6
9
7
22
Lips down
17
26
8
29
14
29
NOTE:
• The bearing (22) is not included in the kit. This
part is reused. The bearing can be installed with
either side facing up. There is not just one way
to install this part.
• The bearing (22) is a transitional fit and in some
installations it may not be removed.
• Be sure u-cup seal (9) is installed with the lips
facing down as shown in Fig. 21.
Fig. 21
3. Remove and discard the 3 small o-rings (17) in the
bottom cover (26) (Fig. 22). Grease the new o-rings
(17) included in the kit and install them in the bottom
cover housing.
Fig. 22
4. Use a pick to remove o-rings (8) and (14) from the
flange (29). (Fig. 23). Grease and replace the
o-rings as shown in Fig. 23.
Fig. 23
5. Reassemble the pump as described in the Reassembly instructions, page 6.
10 3A1494D
Instructions
13
14
15
5
28
15
32
13
33
25
101/102
27
18
19
21
5
55
O-Ring Replacement Kit - 24K293 for 3:1
pumps; 24H855 for 5:1 pumps (Fig. 24)
NOTE: When replacing seals in the pump lower also
service the throat and piston seals. Order repair kit
24H853.
Qty
Ref. Description
13 O-RING 1
14 O-RING 1
15 O-RING 1
Replacement parts for o-ring (13) installed on pump piston (33), o-ring (14) installed on fluid cylinder (32) and
o-ring (15) installed in intake valve housing (28).
.
2. Use a pick to remove the o-ring (15) installed on the
intake valve housing (28) (Fig. 25). Grease the new
o-ring included in the kit and install it inside the
intake valve housing.
3. Reassemble the pump as described in the Reassembly instructions, page 6.
Air Piston Replacement Kit - 24U230,
Series B
Qty
Ref. Part No. Description
5O-RING 1
18 BOLT 1
19 WASHER 1
21 AIR PISTON 1
25 15R001 GASKET, cover, small 2
27 AIR CYLINDER 1
55 O-RING 1
101 LABEL, Identification 1
102 LABEL, overlay, clear 1
.
Fig. 24
1. Use a pick to remove the o-ring (13) installed
around the circumference of the pump piston (33)
(Fig. 25). Grease the new o-ring included in the kit
and install it around the pump piston.
Fig. 25
Fig. 26
3A1494D 11
Instructions
55
30
30
21
21
19
18
27
20
Pump Disassembly,
Follow Pump Disassembly instructions Steps 1 - 10
only, pages 3 - 5.
Pump Reassembly
1. Install o-ring (55) in groove on the end of the displacement rod (30) (Fig. 27).
Fig. 27
NOTE: Loctite® is a registered trademark of the Loctite
Corporation.
Fig. 29
4. Remove pilot valve (20) from the old air cylinder
(27). Apply a light coat of grease to o-rings.
2. To assemble the new air piston, push the air piston
(21) over the end of the displacement rod (30).
NOTE: The counter bored side of the piston (21)
mates with the displacement rod (30) as shown in
Fig. 28.
Fig. 28
3. Apply Loctite® 262 to the bolt (18). Install the
washer (19) and bolt (18). Hold the displacement
rod (30) with an adjustable wrench and use a13 mm
wrench to tighten the bolt securely. Torque bolt to
155 - 160 in. pounds (17.5 - 18.0 N.m) (Fig. 29).
5. Install into new air cylinder (27) (Fig. 30). Torque to
95-105 in. lbs (10.7-11.9 N.m).
Fig. 30
12 3A1494D
6. Install new o-ring (5) around air piston (21), Install
26
27
21
new o-ring (6) into bottom cover (26). Be sure to
apply a thin coat of water-resistant grease to all
o-rings and seals.
7. Slide new air cylinder assembly (27) over the air piston (21) and bottom cover (26) (Fig. 31).
NOTE: The five screws (4) are thread forming
screws and as a result the mating holes in the air
cylinder (27) are not threaded by design.
Instructions
Fig. 31
8. Continue reassembly instructions Steps 9 - 18,
beginning on page 7.
9. Use a permanent marker to record the pump part
number, serial number and series code shown the
original label located on the old air cylinder, onto the
new label (101) included in the kit.
10. Apply label (101) to the new cylinder. Apply the
clear overlay (102) over the new label.
3A1494D 13
Graco Information
For the latest information about Graco products, visit www.graco.com.
TO PLACE AN ORDER, contact your Graco distributor or call to identify the nearest distributor.
Phone: 612-623-6928 or Toll Free: 1-800-533-9655, Fax: 612-378-3590
All written and visual data contained in this document reflects the latest product information available at the time of publication.
Graco reserves the right to make changes at any time without notice.
For patent information, see www.graco.com/patents.
Original instructions. This manual contains English. MM3A1494
Graco Headquarters: Minneapolis
International Offices: Belgium, China, Japan, Korea
GRACO INC. P.O. BOX 1441 MINNEAPOLIS, MN 55440-1441
Copyright 2011, Graco Inc. is registered to ISO 9001
www.graco.com
November 2014
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