OP-755 Part 2 Pages 197-401 - Personal Page of GENE SLOVER

219
The oil in the dashpots should be checked
about once a month, as it may become
depleted due to leakage or to evaporation
in heating. See drawing 231545 for complete
instructions.
(e) Obstruction in line between main pump and hYdraulic
motor or between auxiliary pump and
valve block.
(d) Damaged pump.
Check lines for obstructions.
Check pumps for damage. If auxiliary
pump is damaged it was possibly caused
by running electric motor in the wrong
direction for an extended period. (Especially
in hew installations.)
(e) Excessive friction or locked rotor in auxiliary
pump.
The auxiliary pump rotor maybe locked as
a result of flange screws in rear head
being too tight. This head part 220648-8,
shown on subassembly 271680 is pressure
sealed by corprene ring 164481-5 and the
screws must be loose enough to permit free
movement of the rotor.
IMPORTANT: -
If a binding condition is found to exist
in the auxiliary pump, the loosening of
the screws must not be considered a sufficient
correction. The head must be removed
and an inspection made to see whether
the pump has been damaged by the starting
action. The rotor should be removed and
an inspection made to determine if the
faces of the bronze bushings in pump body
and head have been scored. Anexamination
should be made of the rotor vanes to see
that sheared particles of brass have not
become lodged beneath them. Whenhead
is replaced, .the flange screws should be
tightened while the pump is running, if
possible.