Graco Python XL 5/8" [21/48] Reconnect pump

Repair

3A3948B 21

Reconnect Pump

1. Carefully guide the fluid plunger (105) into the pack-

ing nut (104) and through the packing (103) as the

threads on the fluid cylinder (13) are brought closer

to the lower pump adapter (5).

2. Screw the fluid cylinder into the adapter plate (nn)

until it stops. Tighten fluid cylinder (13) to 30 ft-lbs

(40 N•m).

3. Align the hole in the displacement rod with the hole

in the pneumatic motor rod. Use a screwdriver to

push in the pin (8).

4. Push the retaining spring (9) into place to cover the

pin.

5. Tighten the packing nut (104) to a torque of 15 in-lbs

(1.7 N•m), then loosen and tighten again it to a final

torque of 5 in-lbs (0.6 N•m).

NOTE: If a torque wrench is not present in the field, an

alternative method is to tighten the packing nut (104) fin-

ger tight through the window, then use a small punch or

hex wrench to further tighten by approximately

10 degrees.

NOTE: If the packing nut (104) is over-tightened, the

pump may not complete a full stroke and seal life will be

compromised.

6. Replace the dust cover (10) and secure by tighten-

ing the two screws.

NOTICE

The pump can be damaged if the fluid cylinder is not

screwed all the way into the adapter plate. Be sure to

fully screw the fluid cylinder (13) into the adapter

plate (5).

FIG. 8 Reconnect fluid cylinder

101

104

105

FIG. 9 Retaining spring and connector pin