Chapter 4: Maintenance
4-LV-1-4 12/28/2010
LV1 User Manual
4-7
1.
Locate the piston (2) and slide the isolator bearing (10) with its external seals (15) (add
internal seals (14) only with seal quench option). Make sure the screw holes on the isolator
bearing face toward the seal end of the piston (2).
2.
Locate the retainer (11) and insert a new bearing (12) into it. Make sure the bearing sits
locked into the retainer cavity.
3.
Slide the retainer onto the piston in front of the isolator bearing (11) with the slotted end
of the retainer facing toward the isolator bearing.
4.
Locate the backup rings (7) and slide them onto the piston in front of the retainer bearing
(11).
5.
Locate the piston backup ring (8), and slide it onto the piston tip.
6.
Spray the piston tip with Tri-Clover spray, then locate the piston seal (8) and slide it onto
the piston tip with the flat side of the seal facing toward the backup ring.
7.
Locate the screw (24) that fastens the piston seal onto the shaft and screw it into the end
of the piston. Torque this screw to 70 in-lbs using a 1/8" hex key.
8.
Add Never-Seez grease to the threads of the retainer bearing.
9.
Locate the liquid end body (4) and spray its piston bore with Tri-Clover spray or an
equivalent lubricant.
10.
Make certain that the mating components are free of debris.
11.
Spray the piston seal (9) and gently insert the piston seal assembly into the bore of the
liquid end body (4).
12.
Place the liquid end body in a vise. If the vise teeth are not brass, wrap the liquid end
body in a rag or cloth to protect it.
13.
With its threads lubricated with Never-Seez, carefully screw the retainer into the liquid
end body. The retainer should easily screw into the Liquid end body, pressing the piston
seal into its cavity. If the rotation resistance of the retainer is significant, unscrew the
retainer, and inspect its threads and the liquid end body threads for any debris or burrs.
Do not force the bearing retainer in, and be careful not to cross-thread the components.
14.
Using the bearing retainer removal tool, MFIC Inv. #801.13470, insert the dowel pins into
the bearing retainer slots and rotate the tool in a clockwise direction. Tighten the bearing
retainer to 20-30 ft.lbs using the tool. Do not strike the removal tool with a hammer.
