Danfoss APP 1.0 Installation, Operation And Maintenance Manual page 62

Instruction
6.2 Port plate
Picture 1
6.3 Swash plate
Picture 1
Danfoss A/S
High Pressure Pumps
DK-6430 Nordborg
Denmark
Danfoss can accept no responsibility for possible errors in catalogues, brochures and other printed material. Danfoss reserves the right to alter its products without notice.
This also applies to products already on order provided that such alterations can be made without subsequential changes being necessary in specifications already agreed.
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Trouble shooting guide for APP pumps
180R9262 / IOM APP 0.6-1.0 Appendices - v02 / 12.2012
If the port plate has scratches, level differences or both between the arrows,
the port plate must be replaced.
Even small scratches or wear will cause loss of flow.
To check: See item 6.1, picture 3
If the swash plate is polished 360°, it is an indication of insufficient filtration.
The surface of the swash plate must be plane and even at same level all
over. To check this, please see item 6.1, picture 3.
If the surface has any marks/scratches it is worn/damaged and a new one
is required.
Please contact Danfoss sales office for further information