Graco Endura-Flo 4D150, Instructions - Parts Manual

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Repair/Service
Replace Seals or Rebuild Air Valve
See Repair Kits, page 35 , to find the correct repair
kits for your pump. Parts in Air Valve Seal Kits are
marked †. Parts in Air Valve Repair Kits are marked

. Parts in End Cap Kits are marked

.
Disassemble the Air Valve
1. Perform steps 1–4 under
Replace Complete Air Valve, page 17 .
2. Use a T8 Torx screwdriver to remove two screws
(109). Remove the valve plate (105), the cup
(112, 4D150 models) or the cup assembly
(112–114, 4D350 Models), the spring (111), and
the detent assembly (103).
3. 4D350 Models: Pull the cup (112) off of the base
(114). Remove the o-ring (113) from the cup.
4. Remove the retaining ring (110) from each end
of the air valve. Use the piston (102) to push the
end caps (107, 117) out of the ends. Remove
the end cap o-rings (106). If the pump model
is equipped with DataTrak, also remove the
solenoid release button (118) and o-ring (119).
5. Remove the u-cup seals (108) from each end
of the piston (102), then remove the piston.
Remove the detent cam (104) from the air valve
housing (101).
Reassemble the Air Valve
NOTE: Apply lithium-based grease whenever
instructed to grease.
1. Use all parts in the repair kits. Clean other parts
and inspect for damage. Replace as needed.
2. Grease the detent cam (104) and install it into
the housing (101).
3. Grease the u-cups (108) and install on the piston
with the lips facing toward the center of the
piston.
18 333015E