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

315
(h) Scored valve plates or cylinder blocks in the
hydraulic motor or pump.
(i) Scored bushings or worn vanes in the control
pump.
DISSASSEMBLY AND ASSEMBLY
103. Disassembly and reassembly of most elements of the
powder hoist are apparent from the general arrangement drawings.
Accordingly, no instructions are included here as to
dismantling the hoist doors, door operating mechanisms, door
dog locking mechanisms, the indica tor device or the car or any
of ' its attached devices. However; because of the installed
pos Ltions of the power units and the necessity for dismantling
in order to pass through the gun 'girder access hatches, complete
instructions are compiled in the remaining paragraphs
of this chapter as to disassembly and assembly of all parts
of one A-,.end and B-end mechanism. Instructions as to A-end
parts. are given' in paragraphs 104 to 131; B-end parts are
covered in paragraphs 132 to 161, inclusive.
. l04~To r emoue t tie=c o nt r ot pump (dr . no. 274269). - The
corrt r oL pump can be removed withoui draining the oil from the
system by first removing the .scr ews 180229-7 and 220718-2 from
the inlet and outlet flange's of the pumps. Next remove the
four screws 196825-6 from the pump mounting flange 274269-2.
By springing slightly the inlet and outlet tubing, the pump
shaft can be slipped out OJ its drive gear 274294-3, and the
complete control p~p remoyed.' .
105. To dismantle the control pump(refer dr. no. 274269).
After the control pump has been removed from the A-end, the
lock wire through the screws 274270-2 is to be broken and the
scr evs removed. The pump head 274269-5 can now be removed,
which will permit the removal of all of the internal working
parts but the drive shaft 274269'-4 and bearing 164474-10. The
dri veshaft is removed by loosening the screws 196780-4 and
removing the mounting flange 274269-2. The shaft 274269-4 and
its bearing can be slipped out of the pump housing.
106. To reassemble the control pump. - It is impossible
to assemble these pumps for opposite hand rotation, and care
should be taken upon reassembly, to check the rotation which
is stamped on the pump body. It should be noted that there
are arrows on both bushings, and the rotor, and when properly
assembled all three of these arrows will point in the direction
of the desired rotation. The chamfer on the vanes is on the
trailing' edge. When replacing the pump head 274269-5, care
should be taken to tighten the screws that are diametrically