Service manual

Group 170 Preventive Maintenance

Check Compressor Loading

Note: For further information refer to literature in Func-

tion Group 5.

Raise the air pressure until it is 5.8 bar (85 psi). Time

the air pressure build time from that point with the en-

gine at full speed. The pressure should reach 6.9 bar

(100 psi) in 25 seconds or less. Verify that the governor

cutout is at 9 ± .34 (130 ± 5 psi).

Listen for unusual noises from the compressor while it is

running under load and unloaded.

When the governor cuts out, check for air dryer exhaust

function by listening for the air release from the air dryer

through the door or window.

Check Wipers and Washer

Note: For further information refer to literature in Func-

tion Group 9.

Check the windshield wipers and washer from inside the

cab. Wipers should operate smoothly and without any

binding in the sweep. Listen for any unusual noise. The

blades should clear the swept area without leaving

streaks or missing any spots.

Check the intermittent mode function.

Note: To shorten the interval time, move the lever to nor-

mal wipe position, and then to the interval wipe position

again when the next wiper sweep is desired. This way,

the interval can be programmed between 1–10 seconds.

Operate the windshield washer and check that the spray

pattern covers the windshield effectively.