Graco 16N664, Operation - Repair - Parts

Inlet Valve Fitting Removal/Service 

22

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Inlet Valve Fitting 
Removal/Service

1.

Engage trigger lock and pull prime/spray valve UP to 
release pressure.

2.

Remove material cup, flexible suction tube, and bat
tery.

3.

Hold sprayer upside-down and use wrench to loosen 
and remove inlet valve fitting, inlet valve, and spring. 

NOTE: 

Make sure the spring also comes out. Use nee

dle-nose pliers to remove if needed. Inlet cavity should 
be completely empty (as shown below).

4.

Clean as much excess material from inlet cavity as 
possible. Make sure you also clean spring (a), inlet 
valve (b), o-ring (c), and top of inlet valve fitting (d).

5.

Use a thin wire less than 1/16 in. (such as a paper clip) 
to check that the outlet valve fitting moves freely. If 
valve does not move freely, perform 

Outlet Valve Fit

ting Repair

, page 23.

Installation

NOTE:

 Before installing, make sure o-ring (c) is installed 

on poppet valve (b). A needle-nose pliers can also be used 
to install parts (a - c).

1.

Place poppet valve (b) with spring (a) on top of inlet 
valve fitting (d). Push inlet fitting up into pump cavity.

2.

Hold inlet in place and turn sprayer upside-down. 
Remove inlet valve fitting and visually check to see 
that inlet valve has seated correctly. 

3.

Replace inlet fitting and use wrench or socket to 
tighten to 10 ft-lb (14 N•m). 

4.

Use a pencil or thin rod to lightly push on inlet valve to 
make sure it moves up and down freely. Perform 

Start

ing New Job

 procedure, page 11.

This equipment stays pressurized until pressure is 
manually relieved. To help prevent serious injury from 
pressurized fluid, such as skin injection, splashing fluid 
and moving parts, remove battery and follow the

Pressure Relief Procedure

 when you stop spraying 

and before cleaning, checking, or servicing the 
equipment. 

Move sprayer to a non-hazardous area before servicing.

NOTICE

When removing flexible suction tube from sprayer, make 
sure to pull directly on top fitting of flexible suction tube. 
Flexible suction tube will become damaged if pulled from 
bottom or on flexible portion.

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NOTICE

Do 

NOT

 over-tighten inlet valve fitting. Damage to the 

equipment will occur.

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c

b

a

d

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