Maintenance Flashcards
(27 cards)
Lowering of the cab may be stopped by returning the tilt valve selector handle to the ___
neutral position.
If the distance measured exceeds__ on the REAR BRAKES, the brakes are out of adjust- ment and require immediate attention.
2”
To manually release the spring brake chamber, unscrew (turn counter-clockwise) the ___ located at the end of the spring brake chamber utilizing a ___ or socket assembly.
1/2” diameter bolt / 3/4” box end wrench
The alternator is a Niehoff Model C619-1 ___amp.
340
12.84 volts
100%
12.50 volts
75%
12.18 volts
50%
11.88 volts
25%
The Seagrave apparatus has a special receptacle located underneath on the____ for connecting to electrical jumper cables.
left side of the pump panel
Before using jumper cables, make sure the booster vehicle also has a negative ground system (____).
negative terminal attached to a metal part of the vehicle
To avoid damage to vehicle electronic components, voltage supplied to a vehicle’s electrical system must not exceed __ volts.
16.0
Check system voltage with engine off and all electrical accessories off (____).
12.9 Volts minimum
Start and run engine, engage high idle and check voltage again (____).
13.7 Volts minimum
Weekly
Run engine for ___ at high idle (1000 rpm) with air conditioning at maximum cool and all electrical accessories activated.
10 minutes
Check pressures by gauge (___ front, ___ psi rear).
120 psi
Check operation of pressure governor by opening the tank to pump & tank fill valves fully and setting the discharge pressure at ___.
150 psi
Steering Box and Steering Linkage
Have an assistant move the steering wheel back and forth with short (___) rapid movements.
4” to 6”
Report defect if belt tension is loose enough to allow more than ___ deflection measured at a point midway between pulleys.
1/2”
Dry Vacuum test
This should be at least 20” of vacuum.
Special Lubing King Pins (Steering Axles)
The correct method for lubricating the front axle king pin thrust bearings is to ___ each wheel at the axle. This will remove the load on the bearings.
jack up
When lubricating the universal joints, it is most important to observe the grease seeping past all _____. If grease does not show at any of the seals, tap the opposite side yoke firmly with a plastic or similar type hammer while applying lube gun pressure. If you are unable to get the grease through, report this condition to the shops.
four cross bearing seals
To prevent drive shaft slip yoke galling or seizure, it is necessary to apply grease to the fitting until it appears at the ___ in the end of the yoke plug.
relief hole
The brake caliper assembly takes a special, ____ required by Meritor. The shops will lube these parts at Annual Pump Test or whenever a brake job is performed.
high temperature, high-pressure grease /
The lighthead reaches its maximum efficiency when operated at an angle of ___
+45 degrees.
