PPrroobblleem m CCaauusse e CCoorrrreeccttiioonn
9. 9. Low Low Air Air liglight (ht (DS7)DS7)
is illuminated andis illuminated and
buzzer (LS5) isbuzzer (LS5) is
energized.energized.
(Continued)(Continued)
3. 3. DefectiDefective low ve low air prair pressure essure switcswitchh
(S13).(S13).
3. 3. AlloAllow trucw truck to builk to build air presd air pressursure,e,
shut down engine, and with anshut down engine, and with an
ohmmeter read across each termi-ohmmeter read across each termi-
nal of the low air pressure switchnal of the low air pressure switch
(S13) to (S13) to chassis chassis ground. ground. Ohmme-Ohmme-
ter readings on one terminalter readings on one terminal
should be 0 - 40 ohms while theshould be 0 - 40 ohms while the
other other terminalterminal’s ohmmeter ’s ohmmeter readingreading
should be infinishould be infinityty. . If the air presIf the air pres--
sure gauge, located on the instru-sure gauge, located on the instru-
ment panel, shows good air pres-ment panel, shows good air pres-
sure and the ohmmeter readingssure and the ohmmeter readings
are not as described above,are not as described above,
replace low air pressure switchreplace low air pressure switch
(S13).(S13).
7. 7. BrakBrake Fe Fault ault liglightht
(DS8) is (DS8) is illumiilluminatednated
1. 1. OverstrOverstroke oke indicator indicator switswitch (ch (S27)S27)
is overstroked.is overstroked.
2. 2. BrakBrake coole coolant prant pressessure swure switcitchh
(S23) is defective.(S23) is defective.
3. 3. BrakBrake coole coolant prant pressuessure is re is belowbelow
10 psi.10 psi.
a. Leak in brake cooling circuit.a. Leak in brake cooling circuit.
b. Defective pressure relief valveb. Defective pressure relief valve
in port 3 of the brake manifoldin port 3 of the brake manifold
valve.valve.
4. 4. Brake Brake coolant coolant temperaturtemperature swe switchitch
(S24) is defective.(S24) is defective.
5. 5. BrakBrake coole coolant tant tempeemperaturaturere
exceeds 190exceeds 190
__
FF..
6. 6. TherThere is a e is a shorshort on wt on wire ire #32.#32.
1. 1. VisualVisually ly inspect inspect the ovthe overstrokerstrokee
indicator indicator switcswitch (S27). h (S27). If an over-If an over-
stroked condition has occurred, astroked condition has occurred, a
brass colored indicator rod will bebrass colored indicator rod will be
protruding from the end cover ofprotruding from the end cover of
the power cluster approximatelythe power cluster approximately
3/4” to 1”. 3/4” to 1”. TTo reset, push the indio reset, push the indi--
cator rod back into the end cover.cator rod back into the end cover.
2. 2. RefRefer er to to thetheElectrical SystemElectrical System
TroubleshootingTroubleshootingof theof theBrakeBrake
Fault lightFault lightfound earlier in thisfound earlier in this
section.section.
3.3.
a. Isolate leak and repair.a. Isolate leak and repair.
b. Replace the 175 psi pressureb. Replace the 175 psi pressure
relief valve in the brake man-relief valve in the brake man-
ifold valve at port 3.ifold valve at port 3.
4. 4. RefRefer er to to thetheElectrical SystemElectrical System
TroubleshootingTroubleshootingof theof theBrakeBrake
Fault lightFault lightfound earlier in thisfound earlier in this
section.section.
5. 5. RefeRefer to r to ProblProblem 1. em 1. in thin theeWetWet
Disc Brakes Cooling SystemDisc Brakes Cooling System
TroubleshootingTroubleshootingchart inchart inSectionSection
15C15C..
6. 6. IsolIsolate ate and and reparepairir
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