BENDIX MC-12 MODULATOR CONTROLLER ASSY Průvodce řešením problémů stáhnout pdf (Strana 61)

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Section 9: Air Brake System Troubleshooting Tests

Air Brake System Troubleshooting Tests

Please follow all standard safety precautions, including, but not limited to,

the general precautions listed on page 4 of this handbook.

TEST ONE

Governor cut-out / Low pressure warning / Pressure build-up

Vehicle parked, wheels chocked

Not

1. Drain all the reservoirs to 0 psi.

Start the engine and run at fast idle. The low pressure warning should be on. Note: on vehicles equipped

with ABS, the warning lamp will also come on momentarily when the ignition is turned on. On some

systems, such as the AD-IS

dryer system (illustrated), reservoirs may not ﬁ ll simultaneously and one

reservoir may ﬁ ll to 110 psi before the other starts to ﬁ ll.

3. Low pressure warning; dash warning lamp should go off above 60 psi.

4. Build up time; pressure should build from 85-100 psi within 40 seconds.

5. Governor cut-out; cuts out at the correct pressure, usually 125-135 psi.

Governor cut-in; reduce the service air pressure to governor cut-in. The difference between cut-in and cut-

out pressure must not exceed 30 psi.

1. Check the warning lamp wiring.

2. Check the warning lamp bulb.

3. Repair or replace the buzzer, bulb or low pressure warning

switch(es).

If the governor cut-out is higher or lower than speciﬁ ed by

the vehicle manual:

1. Repair, replace or adjust the governor as necessary after

ensuring the compressor unloader mechanism is operating

correctly.

If the low pressure warning occurs below 60 psi:

1. Check the dash gauge with test gauge known to be accurate.

2. Repair or replace the faulty low pressure indicator switch.

If the compressor build up time exceeds 40 seconds or is

considerably greater than the permanent record ﬁ gure:

1. Examine the compressor air inlet ﬁ lter and inlet line checking

for restrictions, damage or wear. Clean or replace the ﬁ lter or

inlet line as necessary.

2. Check the compressor discharge port and line for excessive

carbon. Clean or replace the discharge line as necessary. If

there is carbon, ﬁ nd the cause of the excessive heat.

3. With the system fully charged and governor in the unloaded

mode, listen at the compressor inlet for leakage. If leakage

can be heard, remove the unloaders and repair or replace as

necessary.

Retest to verify proper operation of all items repaired or

replaced.

Make all the necessary repairs before proceeding to test 2; see checklist 1 for common corrections.

CHECKLIST ONE

If the low pressure warning lamp or buzzer doesn’t come on:

1 2 ... 56 57 58 59 60 61 62 63 64 65 66 ... 69 70

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