(3) Insert a 5/16-inch diameter steel rod
Note. Tighten set-screws in flexible
coupling (14) to avoid their falling out
(approximately 5 1/2 inches long)
and becoming lost. If the key of the hy-
through rotor (15).
draulic pump falls out, keep it with the
(4) Holding cylinder (12) with one hand
(never clamp the cylinder in a vise),
b. Hydraulic Pump. Disassemble hydraulic
drive on the end of the steel rod until
pump in the numerical sequence as illustrated
rotor (15) is freed from rear ball
bearing, rear end plate (10), rotor
bearing spacer (11), cylinder (12),
(1) Mark the position of cover (2, fig.
and vanes (13) from rotor (16).
6-10) with respect
to body (17) be-
(5) S u p p o r t f r o n t e n d p l a t e ( 1 7 ) a s
fore removal, so that the parts will be
closely as possible to the large diam-
assembled with the proper orienta-
eter of rotor (15), and press on the
end of motor pinion (14) until front
(2) Pull pressure plate (4), spring (3),
ball bearing (16) and the front end
pins (5), ring (7), and rotor (8) off
plate are freed.
drive shaft (16).
(6) Only if replacement of either motor
Note. Mark the position of ring (7)
pinion (14) or rotor (15) is required,
and pins (6) to facilitate assembly.
support the front face of rotor, and
insert a steel rod per step (3) into
(3) Remove and discard O-rings (6).
the bore of the rotor. Press on the
(4) Remove snap ring (10). Using a
rod until the motor pinion is freed.
mallet, tap on the end of drive shaft
(16), to free the shaft with assembled
parts from body (17).
Clean all parts with an approved solvent,
and blow dry with compressed air.
and spacer (16) are press-fitted on drive
Caution: Do not spin ball bearings with
(5) Using a suitable bearing puller, re-
move bearing (11) from drive shaft
6-19. lnspection and Repair
(6) Remove bearing (13) from body (17)
by tapping it out with a drift punch.
roughness and binding while being rotated.
Note. Do not remove seal (14) from
drive shaft (16) unless it is damaged. The
Replace bearings if these defects are noted.
seal must be replaced once it is removed.
chips and wear.
If any vanes require
(7) If required, tap key (12) out of the
replacement, use a complete set (12 for the
slot in drive shaft (16).
hydraulic pump or 5 for the air motor).
c. Air Motor. Disassemble air motor in the
numerical sequence as illustrated on figure
cracks, scores, and rough spots. Re-
6-11. Note the following special procedures:
move rough spots and score marks with a
(1) After removing housing cover (4,
piece of emery cloth. Replace if badly worn or
housing by tapping the end of motor
pinion (14) with a mallet. Remove
cracks, nicks, and burrs on the machined sur-
the assembled parts from motor hous-
face. Check that the bore is smooth. Remove
slight nicks and burrs using a fine file or
(2) Hold the assembly in an upright posi-
handstone. Polish the bore with emery cloth to
tion by clamping motor pinion (14)
remove scratches and sligh score marks. Re-
in soft vise jaws. Remove the left-
place if necessary.
hand threaded rotor lock screw (6).