SB-19-085-P PAGE 3
After first 250 hours of operation, remove
gear box and drain gear oil. Refill gear
box with 140-weight SAE Gear Oil or a
high quality worm gear lubricant. Replace
pipe plug and tighten to 20 foot-pounds
(27 N.m) of torque.
6 Months or 2500 Operating Hours -
Replace gear oil according to instructions
above. Replace gear oil more often if
environment causes oil to become con-
taminated during use.
REPLACEMENT OF PARTS
Removal of Air Motor and Gear Box
(Refer to Figure 1 - typical assembly.)
1. Follow pressure relief procedure
(Pg. 1) before removing or loosening
any components.
2. Turn off valve to main air supply and
disconnect air adjusting valve (4) at
nipple (2).
3. Loosen upper cap screw (13) and
remove air motor and gear box
assembly from support (12).
Air Motor (Refer to Figure 2.)
Holes must be drilled for new dowel pins
(21) after assembling front plate (26) on
new body (25) for alignment of parts.
Do not pry front plate (26) or end plate (20)
from air motor body (25) with a screw-
driver; this will dent the surface of the
body and plates, causing leaks. A puller
tool should be used to remove the plate
from the motor body while maintaining
the position of the shaft.
Always install two new gaskets (22)
when reassembling air motor.
Assemble the end plates to the body
using an arbor press with a pusher acting
on both races of the bearing while rigidly
supporting the opposite (drive) end of
the shaft.
Gear Box (Refer to Figure 3.)
1. Remove oil fill plug (37) or cover plate
(33) and drain gear box lubricant.
2. Remove set screws (40) and gear
box (16, Figure 1) from air motor (15,
Figure 1).
3. Disassemble gear box per exploded
view, Figure 3. Discard gaskets (36 and
41). Do not remove oil seal (39) unless
leakage or seal damage is indicated.
4. If oil seal (39) was removed, inspect
seal seating bore in housing (38).
Remove any burrs or contaminants
from seal seating bore. Burrs or con-
taminants could distort new oil seal
during installation.
5. Inspect gear and shaft assembly
(35) for wear grooves, burrs, or con-
tamination of seal seating area. If seal
seating area is damaged, shaft must
be repaired or replaced.
6. Inspect all other parts for wear spots,
chipping, or other damage. Replace
damaged or worn parts.
7. If oil seal (39) is being replaced,
inspect new seal for damage before
installing. Use arbor press to install
seal. Press fixture diameter must be
close fit with gear box bore diameter
to avoid damage to seal. Install with
inner casing and sealing lip toward
bottom of bore. Drive seal squarely
into bore to avoid warping. Check
that seal is fully seated all around at
bottom of bore.
8. Reassemble gear box per exploded
view. Install new gaskets (36 and 41).
Just prior to assembling gear box
with air motor, apply a small dab
of thread locking compound (30) to
threads of set screws (40). Connect
motor and gear box and torque set
screws (40) to 60 inch-pounds (6,8
N.m), minimum. Refill gear box per
gear box lubrication instructions.
