Danfoss APP 46/1780 Service Manual - Page 17

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Service guide | Disassembling and Assembling, APP 21 - 46 and APP W HC 15 - 30

When should the

pistons be replaced

This section provides guidance on, how to deter-

mine whether the parts of APP 21-43 are worn

and should be replaced. In case of doubt - the

pistons must be replaced. The pictures below are

ment as a guideline for evaluating the wear of

the sliding surface.

1. No wear or cavitation of the piston shoe.

New inspection is required in 4,000 hours.

3. Cavitation of the piston shoes.

All pistons must be replaced within the

next 1,000 hours.

Note:

If the pistons break down, the pump will

suffer a disastrous breakdown.

2. Cavitation of the piston shoes.

New inspection is required in 2,000 hours.

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