Echo MS-53BPE Use and care manual - page 8

7E

PUMP DISASSEMBLY AND REBUILD

1) Insure the tank and pressure chamber contents are emptied and pressure 

has been released in the pressure chamber.  To release pressure in the 

pressure chamber activate shut-off valve and release all pressure.

2) Reach into tank fill opening and remove agitator bar from pressure 

chamber body (Figure 1).

3) Disconnect linkage arm from the top of the pump assembly (see section 

covering Installing The Pump Handle). (Figure 2).

4) Loosen pump locking ring and remove entire pump assembly from tank 

(Figure 3).

Check Valve 

Remove check valve cartridge assembly from bottom of pressure chamber 

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

flat blade into slot in bottom of cartridge and unscrew. Once cartridge has 

been removed it can either be replaced as an assembly or rebuilt. To rebuild 

disassemble two halves of cartridge and replace seal and/or ball (Figure 4 and 

5). 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. 

Plunger Cup

Once the check valve has been removed the plunger cup can be replaced as the 

check valve housing holds the plunger cup in place to the bottom of the pressure 

chamber body. The bottom of the pressure chamber body has a groove in it to 

accept the raised ring on the plunger cup.  It is important to insure that these 

two surfaces are aligned and mated before tightening the check valve.  Pump 

performance may be affected if this is not assembled correctly.

Agitator 

Bar

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Boot

Retainer 

Nut

Ball

Pump 

Locking 

Ring

Pressure 

Chamber

Pressure 

Chamber

Plunger

Cup

Check

Valve

Pump Handle Clip

Flat side

Seal

Ball

Counterbore Side