Toro Groundsmaster 455-D Service Manual page 118

General Auxiliary/Steering Pump Information
It is important that the relationship of the back plate
(Item 22), body (Item 14), wear plate (Item 13) and front
plate (Item 7) is correct. You will note two half moon
cavities in the body which must face away from the front
plate. NOTE: The smaller half moon port cavity must be
on the pressure side of the pump. Side of wear plate
with mid section cut out must be on suction side of
pump. Suction side of back plate is always side with
larger port boss.
Repairs
Figure 23
Assembly of Back Plate Parts
1. Install relief valve (Item 17) with new o-rings
(Item 15, 16).
2. Install flow divider spool (Item 23), plug (Item 24) with
new o-ring (Item 19), spring (Item 21), disk (Item 20) and
other plug (Item 18) with new o-ring (Item 19).
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Groundsmaster 455-D