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

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Removethe two screws 196825-7, and the conduit connections,
and the limit switch maybe removed, which
will expose the adjusting screw 274300-4. If the
electric motor. would not start, with the control
lever in "stop" position, turn the adjusting screw
274300-4 "out" about 1/2 turn, and tighten lock nut
180226-11. To accomplish this easily, the complete
assembly of the limit switch mounting and plunger
may be removed by first removing the screws 180226-7.
Next remove the roller 274304-5, and its retaini-:;i
screw 274304- 3. This will permi t the plunger 274303-3
to be withdra"¢m from the housing. Reassemble' the
parts after the adjusting screw has been adjusted
and check to see if electric motor will start.
83. Po adjus t t he con t r o l pump r e lief va l ve. ~ Thisrelie~
valve is located in the valve block assembly (see dr.
274272). It was adjusted at the factory for a pressure of
160 P.S.I. and should not require adjusting unless the valve
block is completely dismantled. To adjust, Loosen acorn nut
274280::..8, and Lock nut 221525-4. To increase the pressure,
turn adjusting screw 274277-8 "in", and to decrease the pressure
"back" screw out. To check the pressure, a pressure gauge
'is to -be screwed into the discharge flange 274289-3 at the control
pump. A 1/4 inch brass plug 191329-9 is to be removed
to permit the use of the pressure gauge. After the pressure
is adjusted to 160 P.S.I. the lock nut and acorn nut is to be
replaced.
84. Adjustment of the main system relief valve. - Refer
to drawing number 274249. The relief valves are found in
the hydraulic motor head, but only one is used for venting
excess pressure from the main circ,ui t high pressure line. The
relief valve on the same side of the motor head 274316-1 as
the #1 flange connection is used for the left hand installation
to control the high pressure. The relief valve on the same
side' as the #2 connection is used to control the high pressure
for a right hand installation. Both relief valves have been
adjusted at the factory for 2100 P.S.I. and it should not be
necessary to readjust them, unless the hydraulic motor head
is completely dismantled. If adjustment becomes necessary,
the relief valve in the high pressure line of the main circuit
is the only one which needs adjusting, as the relief valve in
the low pressure line will act as a check valve.
To adjust the relief valve it is necessary to movethe control
selector lever to mechanical position to cut out the electrical
control. A pressure gauge is to be attached to the air
vent which is on the same side of the hydraulic motor head as
the relief valve (see 274241). The electric motor is to be