Sherwin-Williams 820-001 Manuel du propriétaire télécharger pdf (Page 16)

820-007

Displacement

Pump

WARNING

reduce the risk of serious injury

, always follow

the

Pressure Relief Procedure W

arning

on page

4 before continuing.

Removing the Pump

1. Flush

the sprayer if possible.

Remove the hose clamps (87, 88) and move the

drain tube (90) away from the pump. Unscrew and

remove the suction tube (52). Remove the adapter

(50). See Fig. 6.

Disconnect the hose (20) from the nipple (22). See

Fig. 6.

Push the retaining spring (55) up. Push out the pin

(57).

Loosen the cylinder locknut (103) and unscrew the

pump (26) from the drive assembly (65).

See

Disassembling the Pump

, below

Installing the Pump

1. To

reinstall the pump, rotate the crankshaft so that

the connecting rod (64) is in its lowest position.

Pull the pump piston rod (47) about 1–1/2 inches

out of the cylinder (46), and turn the rod so the pin

hole is about 90



from the outlet nipple (22).

Screw the cylinder locknut (103) all the way down.

Screw the pump (26) into the drive assembly (65)

until the holes in the piston rod and the connecting

rod are aligned. Insert the pin (57) and push the

retaining spring (55) down over the pin.

Screw the pump cylinder

completely

into the drive

assembly; you will feel some resistance from the

packings. Now turn the cylinder back until the out

let nipple (22) faces back. Screw the hose (20)

onto the nipple; tighten it securely

. T

o avoid having

the cylinder locknut (103) loosen due to vibration,

tighten the locknut up against the drive housing to

70 ft–lb (95 N.m).

Reassemble remaining parts reverse from disas

sembly.

NOTE:

Use Repair Kit No. 820–549 to repair the

pump. See page 27. Use all the parts in the kit, even if

the old ones look good. Old and new parts do not seal

together well, and the pump may leak.

Disassembling the Pump

1. Remove

the pump from the sprayer as described

above.

Unscrew the intake valve (48) from the cylinder

(46). If the valve is seized in the housing, squirt

penetrating oil around the threads and gently tap

around the housing with a light hammer to loosen.

See Fig. 7 and 9. Remove the ball guide (40), the

stop pin (39) and the ball (28). Clean and inspect

the parts for wear or damage.

NOTE: T

est the intake valve by filling it with solvent

and seeing if any solvent leaks past the ball. It

shouldn’t leak. The valve must be clean for this test;

any dirt will hold the ball of

f the seat and let the solvent

leak past.

Fig. 6

103



Torque

70 ft–lb

(95 N.m)



Fig.

0742

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 27 28

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Sherwin-Williams 820-001 Manuel du propriétaire Page 16

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