Copyright Meritor, Inc., 2020
Printed in USA
MM-0861 / Revised July 2020
Page 87
7
Power Takeoff (PTO)
m. Insert the spring into the housing over the push rod. Figure
7.12.
Figure 7.12
SEAL
SPRING
CAP
4000226a
n. Apply a thin fi lm of Loctite 518 gasket material to the cap
surface. Install the cap with the 1/4-20 screws using Loctite
242 sealant. Tighten the screws to 10-14 lb-ft (14-19 N∙m).
Figure 7.12.
o.
Install the PTO shaft seal into the housing.
p. Press the seal into position until the seal is seated on the
housing.
3. Install the PTO assembly onto the transfer case.
4. Apply a thin fi lm of Loctite 518 gasket material to the housing.
5. Slide the housing onto the output shaft of the transfer case,
aligning the splines of the clutch to the shaft.
6. Install the eight 7/16” (11 mm) diameter screws and washers
using Loctite 277 sealant. Tighten the screws to 60-75 lb-ft
(81-102 N∙m).
7. Verify the clutch engages and disengages correctly.
8. Pressure test the PTO shifter for air leakage by performing the
following steps.
a.
With the correct fi tting installed into the air control port,
apply a pressure of 90 psi (6.2 bar).
b. Shut off the air supply.
CAUTION
CHECK FOR EXTERNAL LEAKS AT THE COVER PLATE JOINT
AND FITTING IF THE PRESSURE DECREASES MORE THAN 5
PSI (0.3 BAR) IN 10 MINUTES. LEAKS CAN CAUSE COMPO-
NENT DAMAGE.
c.
Check for external leaks at the cover plate joint and fi tting
if the pressure decreases more than 5 psi (0.3 bar) in 10
minutes.
If the external joints are sealed and the leakage is still
more than 5 psi (0.3 bar):
Remove the piston and inspect
the o-ring and housing bore for damage. Repair parts as
necessary.
9. Install the indicator switch. Tighten the switch to 25-30 lb-ft
(34-40 N∙m). Figure 7.13.
If a switch is not used:
Install the special plug and washer used to cap the access hole.
Tighten the plug to 25-30 lb-ft (34-40 N∙m). Figure 7.13.
Figure 7.13
4000227a
SPECIAL
PLUG AND
WASHER
AIR CONTROL
PORT
OPTIONAL
CONNECTOR
SWITCH
ASSEMBLY
INDICATOR
SWITCH
10. Repeat Step 1 through Step 9 for each remaining declutch, PTO
or proportional differential lockout assemblies.
Summary of Contents for MTC-4208X Series
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