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MAINTENANCE
2.7.4
REPACKING THE FLUID SECTION
1.
Remove the foot valve assembly using the steps in the "Servicing
the Valves" procedure (Section 2.7.3).
The outlet valve does not need to be disassembled
i
from the piston for this procedure.
2.
Using an 11/16" wrench, remove the hose from the back of the
fluid section.
3.
Open the latches (Fig. 11, item 1) on either side of the fluid
section. Make sure the locking screws (2) come away from the
slots in the fluid section.
4.
Slide the fluid section forward until the piston is out of the
T-slot on the slider assembly and remove the entire fluid section
assembly.
5.
Slide the piston (3) out through the bottom of the block (4).
6.
Using a vice on the flats of the block (Fig. 12, item 4), loosen and
remove the upper packing retaining nut (5) and piston guide (6).
7.
Remove the upper (7) and lower packings (8) from the block (4).
8.
Clean the block and install the new upper and lower packings.
Refer to the Fig. 13 below for proper packing orientation.
Install upper packing
with raised lip and O-ring
facing down.
O-Ring
Raised Lip
9.
Inspect the piston rod for wear and replace if necessary.
12
1
2
5
6
7
8
3
4
Install lower packing
with the beveled
edge facing up.
Beveled Edge
10.
Insert the piston guide (Fig. 12, item 6) into the retainer nut (5).
Thread the retainer nut (5) into the block until it is hand tight.
11.
Slide the piston guide tool (included in the repacking kit) over
the top of the piston (3) and insert the piston through the bottom
of the block. Using a rubber mallet, tap the bottom of the piston
(3) lightly until the piston is in position in the block.
Coat the piston guide tool and the piston with
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grease before inserting them into the block.
12.
Using a wrench, tighten the retainer nut (5) securely. Torque to
300 in.-lbs.
13.
Slide the top of the piston into the T-slot on the slider assembly.
14.
Slide the fluid section back into position and secure with the
locking screws and latches.
15.
Reassemble the foot valve assembly into the block. Torque to
300 in.-lbs.
16.
Apply grease to the O-ring on the foot valve and replace the
pusher valve assembly. Secure with the clip. The pusher valve
assembly should face the rear of the pump at a diagonal angle.
17.
For Skid/Low Rider units, insert the elbow on the siphon assembly
into the bottom of the foot valve housing. Push the retaining
clip up into the groove inside the foot valve housing to secure
the siphon assembly in position. Thread the return hose into the
pump block and tighten securely.
18.
Place the front cover on the pump housing and secure in position
using the four front cover screws.
19.
Turn on the sprayer by following the procedure in the "Operation"
section of this manual and check for leaks.
Repacking kit P/N 704-586 is available. For best
i
results use all parts supplied in this kit.
Impact X 540I
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