The flash point is 100F138F
Gears are a matched set, therefore
(3859C). If you become dizzy while
both gears must be replaced even if
using cleaning solvent, get fresh air
only one was found damaged.
immediately and get medical aid. If
3. INSPECT DRIVE SHAFT (14).
contact with eyes is made, wash your
eyes with water and get medical aid
a. Replace drive shaft if any wear is detectable
visibly or by touch in seal areas or at drive
coupling. A maximum of 0.002in. (0.051 mm)
Compressed air used for cleaning
wear is allowable. Wear or damage to splines
purposes will not exceed 30 psi. Use
justifies replacement. Wear in shaft seal areas
only with effective chip guarding and
indicates oil contamination.
(goggles/shield, gloves, etc.).
4. INSPECT THRUST PLATES (10).
1. CLEAN ALL PARTS IN SOLVENT P-D-680 AND
a. Thrust plates seal gear section at sides of gears.
BLOW DRY WITH COMPRESSED AIR.
Wear in this area will allow internal slippage,
resulting in oil bypassing within the pump.
b. Maximum allowable wear is 0.002in. (0.051
1. INSPECT GEAR HOUSING.
mm). Replace thrust plates if they are scored,
eroded, or pitted.
c. Check center area of thrust plate where gears
Wear in excess of 0.005in. (0.127
Erosion in this area indicates oil
mm) cutout justifies replacement of
a. Place a straight edge across housing bore. If a
overheating, probably as a result of insufficient
0.005-in. (0.127 mm) feeler gauge will slip
between the straight edge and housing, replace
5. INSPECT BEARINGS (8).
2. INSPECT DRIVE AND DRIVEN GEARS (17).
a. Any wear on gear hubs that is detectable by
If gears are replaced, bearings must
touch, or exceeding 0.002-in.
be replaced also.
Scoring, grooving, or
burring of outside diameter of gear teeth, as well
a. Bearings should fit into bore with a light press fit,
as nicking, grooving, or fretting of teeth surfaces
however, a neat hand fit is allowable. If bearings
tend to fall from bore, bore is probably oversize.