8-49
TMS800E SERVICE MANUAL UNDERCARRIAGE
Published 01-29-2014, Control # 496-00
c. Record the amount of time to build air pressure from
5.86 to 6.89 bar (85 to 100 psi). This time should be
less than 40 seconds.
d. Continue charging the air system until the air dryer
cycles and the compressor shuts off. All system
gauges should read 8.96 bar (130 psi).
e. Reduce air pressure by applying the service brakes
until governor cut-in pressure is reached. The
difference between governor cut-out and cut-in
pressure should be 1.72 bar (25 psi) or less.
f. Release the park brakes by pushing the yellow knob
on the front console.
g. Check that all wheels turn freely.
h. Attempt to operate the outriggers. The outriggers
should not operate with the park brakes released.
i. Turn engine off.
Air Leakage Test
1. If necessary, start the engine and charge air system to
governor cut-out pressure.
2. Turn engine off and allow the air pressure to stabilize for
one minute.
3. Observe the air pressure gauge on the front console for
two additional minutes without the service brakes
applied. Any decrease in air pressure shall not exceed
one (1) psi per minute.
4. Apply the service brakes to full application and hold.
Allow the air pressure to stabilize. Continue holding the
service brakes for two minutes. Any decrease in air
pressure shall not exceed 0.138 bar (2 psi) per minute.
Loss of Primary (Rear) Air System
1. If necessary, start the engine and charge air system to
governor cut-out pressure.
2. Turn engine off and allow the air pressure to stabilize for
one minute.
3. Release the park brakes by pushing the yellow button on
the front console (Figure 8-67). On units equipped with
trailing boom, push the yellow button and the red button.
Ensure the dummy glad hand is installed on the trailer
supply and control disconnects before pushing red
button.
4. Check that all wheels turn freely.
5. Simulate a full air leak by opening the drain valve in one
of the two primary reservoirs.
6. The low air pressure indicator and warning buzzer
should come on when the air pressure in the primary
system drops below 5.17 ± 0.35 bar (75 ± 5 psi). Air
6907-1
Low Pressure Indicator
ABS Warning Indicator
Automatic Traction Control Indicator
ABS Diagnostics and Traction Control
Off-Road Switch
FIGURE 8-67
Reference Only