Graco A Series Instructions Manual page 6

Reassembly
1. Lubricate the packings with a lightweight grease
for easier assembly.
2. Remove the shims from one of the packing stacks
(29*) and install the stack in the throat of the pump
housing. Be sure the lips of the v-packings face
down in the throat. See Fig. 2.
3. Loosely install the packing nut/wet-cup (2).
4. Install the other packing stack (29*) on the piston
(3). Do not disassemble the stack. Be sure the
lips of the v-packings face up on the piston. See
Fig. 3.
5. Place the washer (16) and ball (6*) on the piston,
apply thread sealant to the piston threads, and
screw the piston assembly into the displacement
rod (22). Torque to 150–175 ft–lb (203–237 N.m).
See Fig. 1.
6. Lubricate the displacement rod (22). Carefully
guide the rod into the bottom of the pump housing
(1), and push it up through the throat packings.
7. Install the o-ring (9*) and retainer (12) on the in-
take valve housing (4). Install the ball (7*), ball
guide (13), and ball stop pin (11) in the intake valve
housing. Be sure the pin (11) is in the desired set
of holes. Refer to Check Valve Adjustment.
Screw the assembly into the pump housing (1).
Torque to 80–100 ft–lb (108–136 N.m).
8. Reconnect the displacement pump to the motor
(see your separate pump manual). Reconnect the
ground wire if it was disconnected during repair.
9. Follow the Pressure Relief Procedure on page
2. Tighten the throat packing nut (2) just enough
to prevent leakage, but no tighter. Use the wrench
supplied with the complete pump. Fill the wet-cup
half full with TSL or compatible solvent.
Check Valve Adjustment
The intake check valve is set for high flow rates or high
viscosity fluids. To set the valve for lighter viscosity
fluids or a lower flow rate, to minimize surging at pump
stroke changeover, move the ball stop pin (11) to the
lower set of holes, decreasing the check ball travel. To
adjust the piston check valve for use with very light
viscosity fluids, refer to Accessories on page 11.
Service
MODELS 217–527 & 237–406
Detail of Throat Gland/Packing Stack
Fig. 2
Detail of Piston Gland/Packing Stack
Fig. 3
Lips of v-packings must face down.
Remove shims from packing stack before
installing in throat.
2
*29
1
Lips of v-packings must face up.
Do not disassemble stack when installing on piston.
3
16
29*