MCi Crusader II 1989 Maintenance Manual page 384

Date
1-1-89
Page·_. __
1_2-_4 _ _
MC-9 MAINTENANCE MANUAL
AIR SPRINGS
Effective with unit 41089, the air springs are all of the rolling
lobe (involute) type. The spring is made of molded rubber and
consists of an outer section and· a smaller inner, or piston,
section which moves vertically.
Prior to unit
41089
the air springs used at the front and rear
driving axles are of the double-convolution type, having beads
reinforced at top and bottom with wire. Bead rings are specially
formed and use special bolts. The surfaces of the bead ring and
bolts are so designed as to prevent any chafing of the bellows.
A girdle ring is molded in the center section of the bellows for
reinforcement The trailing axle air springs on the earlier sus-
pension system are the rolling lobe style just as in the later
system.
1.
Raise a'nd block the coach body as outlined under Front
Axle Removal, Section 2.
2. Disconnect height control valve links and pull down on
valve arm to exhaust air from the air spring.
3. On the front suspension, after air is exhausted, remove the
air line to the air spring.
4. Remove nuts.and washers from studs at top of air spring.
5. Remove the mounting bolts from the air spring mounting
plate to the bottom of the air spring. The air spring may then be
removed from coach.
6. On the rear suspension, after air is exhausted, remove the
line to the air spring.
7. Remove the nuts and washers at top of the air spring.
8. Remove bolt from bottom and remove air spring.
Reverse procedure to replace air spring.
RADIUS RODS
The following instructions apply to radius rods used at the
front and the rear driving axles.
Radius rods are mounted at both ends by means of bush-
ings. The condition of these bushings should be checked peri-
odically and any defective parts replaced. Radius rods should
be checked for distortion and cracks. The Magnaflux process is
recommended for detecting cracks in the radius rods. New
bushings should be used when rods are replaced.
To remove radius rods, follow this procedure:
1. Flatten attaching nut locking plate and remove nuts.
2. Remove radius rod end plates from anchor pins.
3. Withdraw radius rod.
Installation of the radius rods is the reverse of removal.
Apply Never-Seize or equivalent lubricantto the bushing inner
race and radius rod pin.
It is extremely important upon reconnection of the rods that
the proper clearance height between the axle and body is
maintained; otherwise. the rubber bushings ln radius rod ends
will become preloaded, shortening the life of these parts. Refer
to figures 12-5 and 12-6.
CAUTION: WtMm relnslalllng radius rods,
make sure that the rod Is centered on the
bushing before tightening retaining nuts.
The radius rod should be held In a centered
position with a pry bar against the coach
body or axle while the stud nuts are tight-
ened. SN specifications al end of section
for proper torque.
It is strongly recommended that periodic checks, depending
upon operation conditions, be made on all radius rods and
bushings. Due to the difficulty in checking the radius rod bush-
ings at the anchor pin above the rear axle, they tend to be
overlooked. Therefore, special emphasis should be placed on
the checking of 1his area If all worn bushings are not replaced,
excessive wear to suspension components and tires will result
,I
10"
r=(_
RIDE HEIGHT/ ,
1. Air Spring
2. Shock ~•orber
4. Lower Radius Rod
5. Axle
3. Upper Radius Rod
Figure 12-SA. Front Suspension Effective With Unit 41089.
1. Air Spring
6. U-Bolt
2. Shock Absorber
7. Suspension Support
3. Upper Radius Rod 8. Radius Rod Qushing
4. lower Radius Rod 9. Jacking Point
5.
Axle Bumper
Figure 12-58. Front Suspension Effective Prior
to Unit 41089.