8-19
TMS800E SERVICE MANUAL UNDERCARRIAGE
Published 01-29-2014, Control # 496-00
Installation
1. Position the axle and suspension assembly under the
carrier.
2. Raise the assembly into position under the carrier
aligning the saddle assemblies pivot blocks and air bags
with the mounting brackets on the carrier.
3. Install the four saddle assemblies cap blocks and secure
each with the bolts and flatwashers. Torque to 305 to
373 Nm (225 to 275 lb-ft).
4. Secure the four air bags to the carrier brackets with two
nuts and washers. Torque the nuts to 41 Nm (30 lb-ft).
5. Apply Loctite® 243 to attaching nut and secure each
shock absorber to the carrier frame with a nut and
washer. Torque nut to 610 Nm (450 lb-ft).
6. Secure the linkage rod of each height control valve to its
respective saddle assembly with the attaching
hardware.
7. Attach the fore and aft torque rods to the carrier frame
using the capscrews, washers and hex nuts. Torque the
capscrews 769 to 834 Nm (567 to 615 lb-ft).
8. Attach the lateral torque rods to the carrier frame using
two bolts, hardened washers, and nuts. Use additional
hardened washers between torque rod and bracket to
aid in properly centering axle.
9. Connect the drive shaft to the front rear axle.
10. Install the air fittings in the inlet of the air bags. Connect
the air lines to the air bags and brake chambers as
tagged during removal.
11. Service the axles and suspension system. Refer to
Lubrication, page 9-1.
12. Build up air pressure in the systems and check for leaks.
Check operation of brakes and air suspension system.
13. Install the tire and wheel assemblies. Refer to Wheels
and Tires, page 8-19 in this Section.
14. Retract the outriggers and check the axles for proper
operation.
WHEELS AND TIRES
Description
The following tire size is available for the axles:
• Front axle; size 445/65R22.5
• Rear axle: size 315/80R22.5.
NOTE: Tire diameter, width, and weight may vary slightly
depending upon the manufacturer.
Tires are designed to operate with a certain sidewall
deflection or bulge. Correct air pressures ensures proper
deflection which, in turn ensures proper traction, flotation,
support of load and prevents excessive flexing of the tire.
Overinflation increases rim stresses which results in lower
rim life.
Inflate tires to the pressure specified on the tire inflation
decal on the crane.
Unmatched tires on either tandems will cause wear, scuffing,
and possible damage to drive units. It is recommended that
tires be matched to within 3.2 mm (0.13 in) of the same
rolling radius and 19.0 mm (0.75 in) of the same rolling
circumference.
In addition to matching individual tire rolling radii and
circumference, match the total tire circumference of one
driving axle should match the other driving axle.The result
will be satisfactory axle lubricant temperatures.
Maintenance
Mounting the Wheels on the Front Axle
NOTE: Do not lubricate the wheel studs or lug nuts or the
wheel face or the hub. On aluminum wheels,
lubricate the wheel pilot or hub pads only with an
antiseize compound or synthetic lubricant with
teflon. Do not lubricate wheel or axle faces.
1. Raise the crane on outriggers so the front wheels are off
the ground.
2. Generously coat the wheel pilot or hub pads with
antiseize compound. Do not apply antiseize compound
to the face of the wheel or the hub.
CAUTION
Do not mix tires or rims from different manufacturers.
CAUTION
Do not install the largest tires on one driving axle and the
smallest on the other driving axle. This will cause axle
“fight” and high lubricant temperatures resulting in
premature lubricant breakdown and costly axle service.
DANGER
Do not dismount or mount tires on rims without proper
training. High pressures can cause tire and rim parts to fly
apart with explosive force and cause injury or death.
Reference Only
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