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DISASSEMBLING AND REPAIRING THE PUMP ASSEMBLY
In-Tank
Filter
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Chapin Backpack Sprayer Operator's Manual - English
1.
Release the pressure from the sprayer and remove all liquid from
both the pressure chamber and tank.
2.
Remove the In-tank filter from the pressure chamber (fig. 1).
3.
Remove hose (fig. 2).
4.
Remove 2 bolts attaching the pivot lever to the pump shaft and
remove piston assembly (fig. 3).
5.
Remove the 2 bolts holding back spine/frame (fig. 4), and the back
spine/frame will come off.
6.
Rock the pressure chamber back and forth and push down to free it
from the tank (fig 5). Once freed the entire pump assembly can
be removed.
7.
The pressure chamber o-ring can be replaced. DO NOT stretch
the o-ring over the bottom flange. Assemble the o-ring over the top
of the chamber. Apply petroleum jelly to the o-ring before
reinstalling pump assembly into the tank (fig. 6).
8.
To inspect piston and/or piston cylinder components, remove
protective dust cap (fig. 7 ).
9.
Remove the piston (fig. 8) and inspect for wear. See next page for
further repair instructions.
10.
Reassemble in reverse of removal. Note: there is a notch/tab
combination in the pump assembly/tank to be used for
alignment (fig. 9).
Pump
Assembly
Figure 6
Figure 8
7E
Pressure
Chamber
o-ring
Tank tab
Protective
Dust Cap
Figure 7
Pump
Assembly
Notch
Figure 9
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