Piston Cylinders Or Metering Tubes - Graco PR70 Series Operation And Maintenance Manual

Pistons & Metering Tubes

Piston Cylinders or Metering Tubes

Figure 49 PR70 Nylon and UHMWPE Piston Replacement Kits
Key:
Ref Description
1 Piston
2 Screw
When ordering a piston replacement kit, the following
intelligent part numbering system applies for Nylon
based pistons:
LCF - 120
Code : A
When ordering a UHMWPE replacement kit, the
following numbering applies:
LCE - 160
Code : A
The items indicated in Figure 46 above will be
supplied with the kit. Refer to the Models section for
the available standard piston sizes.
312393C
QTY Ref
1 3
1
Description
Oring
To install a new Piston or Piston/Cylinder
Replacement Kit:
1. Drain the machine pistons by instigating several
shots with either the tank ball valves closed (if
installed), or by activating enough shots to empty
the tanks.
2. To prevent machine movement, press
3. Remove the pump end caps (item 8 of figure 46)
by removing the 4 end cap screws (item 6 of
figure 46). Allow the cap to hang by the hose.
4. Remove the cylinder and Orings (items 1 and 6 of
figure 50) from the pump housing (item 7 of figure
46) and pump cap.
5. Select an operating mode, then fully extend the
pistons by activating the
screen.
6. To prevent machine movement, press
7. Remove the existing piston (1) and any front or
rear washers (items 3 & 4 of figure 50) from the
pump shaft (item 11 of figure 46) by removing the
piston screw (2). A wrench will be required near
the drive block to prevent the pump shaft from
rotating while the screw is removed.
8. Install the new piston and any rear or front
washers, by re-installing the piston screw into the
pump shaft. When tightening the piston screw,
QTY
2
option in the M1
41 of 52
(red).
(red).