Service Manual

BDP-10A/16A/21L

REMOVAL, INSPECTION AND AS-

SEMBLY OF THE END CAP AND

VALVE PLATE BDP-21L

Refer to figure 24.

Disassembly BDP-21L

1. Using any combination of two, 9/16” wrenches

or 9/16” socket and rachet drive, loosen the end

cap bolts (58) evenly.

2. Keeping the end cap (25) held in place re-

move the four end cap bolts (58).

3. Slowly remove the end cap (25).

4. Remove the valve plate (29).

5. Remove housing alignment pins (26).

6. Remove housing gasket (28).

Inspection BDP-21L

1. Inspect the end cap (25) body for damage,

nicks or unusual wear patterns. Replace if nec-

essary.

2. Inspect the bronze side of the valve plate

(29). The running surface may show evidence

of minor abrasive rings.

This is normal. Grooving in the plate, or material

transfer that is evident when the surface is

checked by dragging a fingernail across it, would

be cause for replacement of the valve plate.

3. Inspect and replace alignment pins (26) if bent

or distorted.

4. Replace the housing O-ring (28) with a new

O-ring before reassembly.

Assembly BDP-21L

1. Install housing O-ring (28) into housing O-ring

seat in housing (15).

2. Install alignment pins (26) into housing (15).

3. Lubricate the valve plate prior to installation.

Install valve plate (29) with the bronze side down,

contacting the cylinder block.

4. Install end cap (25). Before installing the four

end cap bolts (58), push down on end cap (25)

verifying alignment and insuring that the cylinder

block pistons spring back and fourth. Install end

cap bolts. Tighten, per Table 6, page 16, torque

values.

Figure 24. BDP-21L

56 x2

58 x4