Section 1: Introduction; Introduction; Welding On An Axle; Models - Meritor RS-220 Maintenance Manual

Section 1

Introduction

Introduction
Introduction Section 1

Welding on an Axle

For complete welding instructions, refer to
Maintenance Manual 8, Drive Axle Housings . Call
ArvinMeritor's Customer Service Center at
800-535-5560 to order this publication.

Models

RS-15-220
RS-17-220 and 224
RS-19-220 and 224
RS-21-230
RS-23-240
The differentials are two-speed drive units with
planetary gear ratios that possess the following
characteristics:
1. Generoid system ring gear and pinion
2. Pinion with its spindle resting on two tapered
roller bearings that absorb the axial and radial
loads and a roller bearing on the pilot head
that absorbs the radial loads
3. Differential carrier and ring gear assembly
mounted on tapered roller bearings
4. Side and pinion gears with tapered straight
teeth
5. The second ratio has a planetary system of
straight teeth located under a hypoid ring
gear.
First Gear Ratio — High Speed
At high speed the sun gear engages with the case
half and blocks the operation of the planetary
system gears. With the planetary reducer blocked,
the tractive force is transmitted directly to the
differential gear. Therefore, the tractive unit will
work as a single reduction drive system, allowing
the vehicle to develop higher speeds. Figure 1.1 .
2
Figure 1.1
Second Gear Ratio — Low Speed
At low speed the sun gear engages with the lock
plate. The speed shift command is activated by an
electric, pneumatic or vacuum mechanism,
installed in the differential and actuated from the
vehicle's cab. When the control is activated, the
sun gear changes from its previous position and
engages in the lock plate, freeing the planetary
system gears. Therefore, the tractive unit will work
as a double reduction drive system, allowing the
vehicle to develop higher tractive capability.
Figure 1.2 .
Figure 1.2