Echo MS-53BPE Use and care manual - page 10

9E

5) Remove the three bolts attaching the piston cylinder to the bottom of 

the tank (Figure 4).

 6) Reach in through the tank fill opening and remove the piston cylinder.

7) Remove check valve cartridge assembly from bottom of piston cylinder 

utilizing pump handle clip (clip has flat blade incorporated into end).  Place 

flat blade into slot in bottom of cartridge and unscrew (Figure 5 and 6).

8) Once cartridge has been removed it can either be replaced as an 

assembly or rebuilt.

9) To rebuild disassemble two halves of cartridge and replace seal and/

or ball. Replace cartridge (Figure 7). The seal mounts inside the larger of 

the two halves of the cartridge. The seal counterbore side mounts into the 

grooves in the cartridge halve. Pump performance my be affected if this is 

not assembled correctly.

10) At this point the piston cylinder itself and/or piston cylinder stud 

gaskets can be replaced. The piston cylinder stud gaskets must be oriented 

correctly or leakage may result (Figure 8).

11) Reassemble piston cylinder using washers and bolts on the underside of 

the base.

12) Replace pump assembly into tank and into the piston cylinder which is 

mounted on the bottom of the tank (see important notes regarding gasket 

and felt washer in Pump and Disassembly and Rebuild section). Be careful 

not to damage the plunger seal as it seats into the piston cylinder. It is 

recommended that you  look through the tank fill opening while performing 

this to achieve better alignment.  If necessary you can also reach in and use 

your hand to guide the plunger seal into the piston cylinder.

13) Position the pump outlet (hose connection) in the desired position. 

Tighten the pump retaining ring onto the tank. 

14) Reach into tank fill opening and attach agitator to pressure chamber 

body.

15) Connect linkage arm to the top of the pump assembly (see section 

covering Installing the Pump Handle)

Figure 5

Piston Cylinder

Figure 4

Check Valve

Flat side

Seal

Ball

Counterbore Side

Figure 6

Figure 7

Stud Gaskets

Figure 8