D
Group 177 Preventive Maintenance
Front Brake Air Pressure Gauge
Rear Brake Air Pressure Gauge
53
Check Air Compressor
1 Increase the air pressure until it is 585 kPa (85 psi).
Time the air pressure build time from that point with
the engine at full speed. The pressure should reach
690 kPa (100 psi) in 25 seconds or less. Verify that the
governor cutout is at 900 ± 35 kPa (130 ± 5 psi).
2 Listen for unusual noises from the compressor while it
is running under load and unloaded.
3 Check ventilation for dirt and/or damage.
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