NOTE: There are two cover plates on the coun-
tershaft, one at the front and one at the rear.
5.
Check for signs of leakage at the rear cover
plate on the countershaft (next to the output
yoke). If leakage is found, check the torque on
the cover-plate bolts and check the flat seal for
damage.
5.1
If the flat seal is damaged, replace it.
5.2
If the cover-plate bolts are too loose,
tighten them 18 lbf·ft (25 N·m). If the
cover-plate bolts are too tight, replace the
flat seal and tighten to 18 lbf·ft (25 N·m).
6.
Check for signs of leakage at the transmission
fluid fill plug. If leakage is found, check the
torque on the plug and check the aluminum gas-
ket for damage.
6.1
If the gasket is damaged, replace it.
6.2
If the fill plug is too loose, tighten it 42
lbf·ft (57 N·m). If the fill plug is too tight,
loosen it, then tighten it to 42 lbf·ft (57
N·m).
7.
Check for signs of leakage at the transmission
fluid drain plug. If leakage is found, check the
torque on the plug and check the aluminum gas-
ket for damage.
7.1
If the gasket is damaged, replace it.
7.2
If the drain plug is too loose, tighten it 42
lbf·ft (57 N·m). If the plug is too tight,
loosen it, then tighten it to 42 lbf·ft (57
N·m).
8.
Check for fluid dripping at the gear case seals. If
substantial leakage is found at either location,
replace the transmission.
NOTE: Weeping or sweating seals are not
cause for transmission replacement.
WARNING
Clutch hydraulic fluid (DOT 4 brake fluid) is haz-
ardous. It may be a skin irritant and can cause
blindness if it gets in your eyes. Always wear
safety glasses when handling clutch hydraulic
fluid or bleeding hydraulic lines. If you get clutch
hydraulic fluid on your skin, wash it off as soon
as possible.
9.
Check for signs of leakage at the clutch slave
cylinder.
NOTICE
Do not spill clutch hydraulic fluid (DOT 4 brake
fluid) on the cab paint. Clean it off immediately if
any is spilled. DOT 4 brake fluid can damage
paint.
9.1
If leakage is found on the slave cylinder
body, check the fittings and hose for dam-
age.
9.2
If leakage is found on the piston seals,
replace the slave cylinder and bleed the
clutch hydraulic system. For detailed in-
structions, see
Group 25
of the
Business
Class® M2 Workshop Manual
.
9.3
If the slave cylinder fittings and/or the
hose are damaged, replace them.
9.4
Check the torque on the slave cylinder
mounting capscrews. Tighten them 13
lbf·ft (18 N·m).
9.5
If any leakage of clutch hydraulic fluid is
found, check the fluid level in the reser-
voir, and add fluid if needed. For detailed
procedures, see
of this
manual.
NOTE: There are two cover plates on the coun-
tershaft, one at the front and one at the rear.
10. Check for signs of leakage at the clutch bell
housing. If leakage is found, check the radial
seal on the input shaft, the front cover plate on
the countershaft (inside the clutch bell housing),
and the rear radial seal on the crankshaft.
10.1
If the radial seal on the input shaft is
leaking, replace the radial seal. For pro-
cedures, see
Section 26.02, Subject 120
of the
Business Class® M2 Workshop
Manual
.
10.2
If the cover plate on the countershaft is
leaking, replace the cover plate. Apply
liquid gasket (Loctite 518) to the new
cover plate when installing it.
10.3
If the rear radial seal on the engine
crankshaft is leaking, replace the rear ra-
dial seal. For procedures, see the engine
manufacturer’s manual.
Transmission
26
Business Class M2 Maintenance Manual, March 2016
26/11
Property of American Airlines
