Copyright Meritor, Inc., 2022
MM-0861 / Revised 06-22
Page 84
Printed in USA
8 Power Takeoff (PTO)
Install the PTO Onto the Transfer Case
1. Install two dowel pins into the transfer case PTO flange.
2. Apply a thin coating of Loctite
®
518 gasket sealant to the
entire PTO flange mounting surface.
3. Slide the PTO assembly onto the output shaft spline. Align the
assembly to the two dowel pins.
4. Install the washers and mounting bolts. Tighten the bolts to
60-75 lb-ft (81-102 Nm).
5. Install the PTO air control line and fitting. Follow the vehicle
manufacturer’s instructions.
Test the PTO Installation
CAUTION
The PTO clutch must be engaged to operate the drive. Always
engage and disengage the PTO with the vehicle stationary and in
Neutral. NEVER apply a load to the PTO drive until the drive has
been engaged. Damage to components can result.
The air pressure must not exceed 90 psi (6.2 bar). Damage to
components can result.
1. Connect a regulated air pressure line to the air control port.
4000217a
AIR
CONTROL
PORT
PTO
ASSEMBLY
PTO SWITCH
(OPTIONAL)
Figure 8.6
2. Apply 90 psi (6.2 bar) of air pressure.
3. Check for leaks in the PTO air control line.
4. Cycle the air control pressure. Follow the procedures below to
verify the PTO clutch engages correctly.
PTO Without an Optional Indicator Switch
1. Remove the switch port screw and washer. Figure 8.4.
2. Measure the PTO push rod travel to verify the travel is 0.75”
(19 mm) and the clutch is fully engaged.
If the push rod travel is not at 0.75” (19 mm) and the PTO
clutch is not fully engaged:
Disengage the clutch by releasing the air pressure. Rotate the
clutch output shaft by hand and retest.
If the clutch still is not fully engaged:
Remove the PTO assembly. Check the transfer case output
shaft splines and the PTO clutch collar splines. Replace worn
or damaged parts. Repeat the assembly procedures.
PTO with an Optional Indicator Switch
1. Install the indicator switch. Tighten the switch to 25-30 lb-ft
(34-40.8 Nm).
2. Verify the indicator switch closes when the PTO completes a
shift to engage the drive. Figure 8.5.
If the indicator switch does not close to fully engage the
drive:
Measure the PTO push rod travel to verify the travel is 0.75”
(19 mm) and the clutch is fully engaged.
If the push rod travel is not at 0.75” (19 mm) and the PTO
clutch is not fully engaged:
Disengage the clutch by releasing the air pressure. Rotate the
clutch output shaft by hand and retest.
If the clutch still is not fully engaged:
Remove the PTO assembly. Check the transfer case output
shaft splines and the PTO clutch collar splines. Replace worn
or damaged parts. Repeat the assembly procedures.
NOTE:
If there is any concern about the functionality of the
indicator switch, consult the indicator switch manufacturer for
guidance.