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

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38. Projectile ring inoperative due to pressure failure.
- Although the main pump supplies the pressure for rotating
the projectile ring, the auxiliary pump must be in operating
condition at all times to shift the valves to proper position
to make rotation possible. To determine what part of
the system is responsible for malfunctioning, pressure gauges
should be placed in both the opera ting and control lines. Probable
causes are as follows:
(a) Electric motor running in the wrong direction.
Check rotation with direction arrow on
A-end.
(b) Insufficient oil supply in system.
Check oil level in supply tank.
(C) Obstruction in auxiliary pump intake line.
Inspect for foreign matter such as rags,
etc.
(d) Linkage in A-end improperly adjusted.
Place operating lever in neutral and check
linkage for tightness and proper adjustment.
(e) Relief valves improperly adjusted.
Determine· by pressUre gauge which lines
are responsible, then adjust to proper
setting .•
(f) Relief valve, by-pass valve or check valve
stuck open.
Inspect and clean.
(g) Starting and control valves improperly adjusted.
Although this is improbable, due to liberal
openings, check to determine if settings
agree wi th those prescribed in paragraphs
25 and 26.
(h) Interlock valve failing to shift.
Check for binding condition and clean.