Graco 246780 Manuale Utente

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Be sure you have all necessary parts on hand 
before you start. If using a repair kit, use all the 
parts in the kit for the best results. 

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Displacement Pump Repair Kit 246920 is available. 
Parts included in the kit are marked with a dagger 
(†) in the parts drawing and list.

1. Flush pump.

2. Relieve pressure, (page 6).

3. Disconnect hoses and remove pump from its 

mounting. Clamp the air motor base (5) in a vise.

4. Use strap wrench to remove shovel tube (67).

5. Unscrew shovel (66) from priming rod (58).

6. Unscrew seal retainer (63) from pump cylinder (59). 

Remove o-ring (61) from seal retainer. Inspect all 
parts for damage. 

7. Use a strap wrench to remove pump cylinder (59) 

from the extension tube (64). Remove intake seal 
(62) from pump cylinder. Remove gasket seal (60) 
from pump cylinder. Inspect all parts for damage.

8. Use a small punch to drive pin (53) out of connect-

ing rod (57) and piston (52) connection. Unless 
priming rod (58) is damaged, leave the pin connect-
ing the piston (52) and priming rod (58) assembled.

9. Unscrew piston/priming rod assembly from the con-

necting rod (57). Slide piston seal (54) off piston and 
inspect for damage.

10. Check to make sure there is endplay at pinned con-

nections. 

11. Clean all parts in a compatible solvent and inspect 

them for wear or damage. 

To avoid damaging the shovel tube, do not use slots 
in the tube to tighten or loosen tube.

When there is endplay at the pinned connection, 
you should be able to slightly move from 
side-to-side, the connecting rod (57) pinned to the 
displacement rod (8) and the piston (52) pinned to 
the priming rod (58).

If these connections seem too rigid:

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remove the pin

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adjust hole alignment by 1/2 turn in the 
direction that aligns the thru holes as close 
as possible, axis-to-axis (F

. 3). Improper 

alignment take the self-aligning feature out 
of the design, which could result in damage 
to the pump.

Correct Alignment

Permits end play

Fig 3 - Correct

Fig 1 - 1/2 Turn Too Deep

Incorrect Alignment

Fig 2 - 1/2 Turn Too Shallow

Does not permit 
end play

ti10469a

ti10468a

Does not permit
end play

ti10479a