Operational Test
- Block the wheels.
- Apply the parking brake.
- Start the engine. Charge the air system to the air compressor governor
cutout point.
- Stop the engine.
- Verify that the two-speed rear axle is operating properly.
| 5.1. | Verify that the two-speed rear axle promptly switches to the LOW range
when the two-speed rear axle shift control valve lever is switched to LOW. |
| 5.2. | If the two-speed rear axle shift motor is sluggish, switch the two-speed
rear axle shift control valve lever to LOW. Verify that air vents through the exhaust
port of the two-speed rear axle shift quick release valve. |
| 5.3. | If air does not vent through the exhaust port of the two-speed rear axle
shift quick release valve, repair or replace the two-speed rear axle shift quick
release valve. |
- Remove the wheel blocks.
Air Leakage Test
- Block the wheels.
- Apply the parking brake.
- Start the engine. Charge the air system to the air compressor governor
cutout point.
- Stop the engine.
- Shift the two-speed rear axle shift control valve lever to HIGH.
- Inspect the two-speed rear axle shift quick release valve exhaust port
for air leakage. Air leakage less than a 25.4 mm (1.0 in) bubble in
3 seconds is acceptable.
- If the air leakage is too much, repair or replace the two-speed rear
axle shift quick release valve.
- Inspect the upper and lower valve body for air leakage. Air leakage is
not allowed. If any bubbles appear, repair or replace the two-speed rear axle shift
quick release valve.
- Remove the wheel blocks.
