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

313
Lng " or "Lowering" the trouble will probably be insufficient
clearance between the rocker arm rollers and the cams in the
B-end.
99. Excessive drop of the powder car when the brake ts
released. - The normal drop of the powder car, when the brake
is released should be from 1/2 to 3/4 of an inch. This is due
to the compression of the oil in the main circuit. If the drop
is excessive the probable reason is leakage in the foot valve
assembly which is mounted on the B-end hydraulic motor head.
This leakage will be caused by one of the following reasons:-
(1) The by-pass valve 274335-4 in the foot valve
assembly is improperly adjusted. .
See instructions "To adjust Foot Valve
Control Linkage", paragraph 86.
(2) The check valve 274331-2 in the foot valve
assembly is binding or stuck open due to foreign
particles. .
Removethe cover 274330-5 and check the
valve for cleanliness or binding (see
dr. no. 274249).
(3) The relief valve ball 274341-15 held off its
seat by foreign particles.
Removethe cover 274330-9 and check the
ball 274341-15 and plunger 274331-9 for
cieanliness or binding.
100. Excessive heating. - If the unit gets excessively
hot, it will probably be due to one of the following causes:
(1) Insufficient oil in the system.
Check oil level in the A-end tank.
(2) Mechanical bind in the equipment or the powder
car.
Check pressures with gauge in the main
circuit lines at the pressure gauge connections
on the B-end. (See par. 43.)
101. Unusual noises and their causes. -
( a) When operating using "Servo Electrical" or
"Servo Mechanical" control the unit will function
with only the normal amount of noise and