Copyright Meritor, Inc., 2020
Printed in USA
MM-0861 / Revised July 2020
Page 35
2
Introduction
Blow-by Breather
The rear cover portion of the housing is equipped with a blow-by
breather for the high/low shifter. Figure 2.14. The breather, which
points sideways on the driver side of the housing, prohibits pressuriza-
tion of the housing if an o-ring becomes damaged. Because all range
shifts require full time pressurization, a damaged o-ring would allow air
to fi ll the housing which could further damage the yoke seals or blow
oil from the housing.
Figure 2.14
4000191d
HIGH RANGE
PORT
LOW RANGE
PORT
BLOW-BY
BREATHER
(IF EQUIPPED)
NEUTRAL PORT
(PTO-EQUIPPED ONLY)
Full-Torque Power Take-Off (PTO)
CAUTION
NEVER ENGAGE THE FULL-TORQUE POWER TAKE-OFF
(PTO) WHEN THE TRANSFER CASE PROP SHAFTS ARE
TURNING. DAMAGE TO THE TRANSFER CASE WILL RESULT.
Engage or disengage the PTO when the vehicle is stationary, the trans-
mission is in Neutral, and the transfer case prop shafts are not turning.
NEVER load the driven auxiliary device when PTO is initially engaged.
Use the transfer case in-cab switches to place the transfer case into
Neutral.
Engagement can be confi rmed by hearing it or observing the optional
indicator light in the cab.
The PTO may be operated in high/low/Neutral range.
When operating the PTO in Neutral range, do not exceed 2,000 rpm.
Control the transmission shift range and engine rpm to ensure this limit
is not exceeded.
Summary of Contents for MTC-4208X Series
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