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

211
(C) The purpose of the replenishing check valves
(58) and (59) is to admit fluid supplied by
the auxiliary pump into the operating circuit
to compensate for the normal internal leakage.
(d) The starting interlock switch (60) prevents
starting the electric motor unless the pump
yoke is in neutral.
(e) Line (61) is the drain for internal leakage
within the B-end case and is connected to the
A-end case.
(f) Line (62) carries to tank the air displaced
by internal leakage within the B-end case.
(g) Lever (63) provides for manual release of the
brake should it be desired to manually drive
the projectile ring at another source.
MAINTENANCE ANDOPERATINGINSTRUCTIONS
19. The projectile ring assemblies are to be operated
and maintained, including periodic exercise, adjustment and
lubrication, in accord with the regulations of the Ordnance
Manual and the specific directions below and in the chapter
entitled "Hydraulic Equipment".
20. Hydrau lie ai Z. - The fluid required for correct
performance of the hydraulic system is a spec ial oil with properties
as designated in Ordnance Specification No. 1113. When
ini tially filling a sys tem and when repleni shi.ng , the oil is
to be poured through a fine mesh wire strainer of at least 120
wires to the inch _ Do not use cloth. Newassemblies should
be drained after fifteen hours operation, and should then be
thoroughly flushed clean and refilled with fresh oil or carefully
salvaged oil. Perform test inspection and analysis of
oil sample from each system monthly. If there is evidence of
sludge, water or acidity, drain, flush and refill with fresh
oil. The amount of oil required to fill the system of one projectile
ring drive unit is approximately 25 gallons. The procedure
for filling that quantity into an empty system is as
follows:
(a) Remove the filler cap from the A-end and fill
case to the upper level petcock. This requires
22 gallons.
(b) Remove inspection cover from the B-end and fill
case with one gallon of oil.