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Heavy Equipment Technician Period 4 > HET 4 TRANSFER CASE > Flashcards

HET 4 TRANSFER CASE Flashcards

190401g

1
Q

What is used to drive a front steer axle?

A

Transfer Case

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2
Q

How many outputs does a transfer case usually have?

A

Two

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3
Q

Does the front drive shaft from the transfer case need to be driving all the time?

A

No, if there is a sliding shift collar the front axle can be disengaged

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4
Q

What type of lubrication system is used in transfer cases?

A

Splash and presurized

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5
Q

Front and Rear output shafts on a transfer case are driven at what gear ratio?

A

The same

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6
Q

What other component can be driven by a transfer case?

A

Power Take Off

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7
Q

A high/low range transfer case is shifted using?

A

Air

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8
Q

A high range in a transfer case is or close to what ratio?

A

1:1

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9
Q

In a proportional differential/lockout, what is the Input member (Carrier)??

A

Main drive shaft

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10
Q

What is the reactionary member in a proportional differential?

A

Traction and Resistance provided by each output shaft

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11
Q

What is considered the “SUN” in a proportional differential?

A

Front Output Shaft

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12
Q

The rear output shaft on a proportional differential is what component?

a) sun
b) internal
c) reactionary member
d) Internal

A

Internal and it is a Reactionary member

a and d

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13
Q

If traction is lost at the rear axle on a vehicle with a proportional differential, what happens to the front axle?

A

looses torque

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14
Q

If traction is lost at the rear axle on a vehicle with a proportional differential, what can be done to drive forward?

A

Apply the lockout clutch

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15
Q

What can cause seal failures in a transfer case?

A

Improper stall, excessive end play, loose fastener, contamination, excessive pressure

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16
Q

What are the two visual inspections that a technician should do on a transfer case?

A

Level check and plug swap

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17
Q

How are transfer case housings joined?

A

Sealant

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18
Q

How is a PTO sliding clutch engaged and disengaged?

A

Air engaged, spring disengaged

19
Q

How many indicators do PTOs have for the operator?

A

2, engaged and disengaged

20
Q

In off-road equipment, the front axle has a declutch in the transfer case?

A

No, usually has a proportional differential and lockout. Full time transfer case

21
Q

If the transfer case bearings are preloaded, will this prolong the life of the bearings?

A

no

22
Q

Should a transfer case have end play or bearing preload?

A

End play - Manufactures spec

23
Q

What is a normal manufactures spec for gap on a bearing cover on a transfer case?

A

0.008” gap

pg 17 190401g

24
Q

What is used to change end play on a transfer case bearing?

A

Shim pack between bearing cover and transfer case housing

25
Q

Why must there be end play for bearings in a transfer case?

A

allow for heat expansion

26
Q

PTO mounts are rated by?

A

Horse power

27
Q

How can a PTO be engaged and disengaged?

A

Cable, Mechanical, Air, Electrically

28
Q

What position is the transfer case in when engaging and disengaging PTOs (normally)?

A

Neutral

29
Q

True or False

PTOs only have one output shaft?

A

FALSE

30
Q

Where can a PTO be mounted to?

A

Main Transmission
Auxiliary Transmission
Transfer Case

31
Q

What are the two types of duty cycle that a PTO can run at?

A

Intermittent or Continuous

32
Q

During install of a PTO what must a technician must be aware of?

A

Gear Backlash, Fastener length, Gaskets

33
Q

How is backlash changed on a PTO?

A

Gaskets/Shims between PTO housing and mounting housing

34
Q

How is backlash measured on a PTO?

A

Remove inspection cover, use dial indicator

35
Q

The average backlash on a PTO is?

A

0.006”-0.012”

36
Q

What is the maximum amount of gaskets/shims allowed to change backlash on a PTO?

A

4 gaskets MAX

37
Q

When adjusting backlash on a PTO, the technician finds that 4 gaskets are not enough to get correct backlash. Is there anything the technician can do?

A

Special filler block can be used

38
Q

If an old PTO used a 6 bolt plate but the new mounting surface has 8 bolts for mounting, is it okay to just use the 6?

A

No, use an adapter plate to fit the 8 bolt opening

39
Q

A technician cannot install a PTO due to an obstruction from a valve. The technician says he cannot install the PTO anyway, are they correct?

A

No, the tech can use an adapter housing

40
Q

If an adapter housing is used to install a PTO, what must be checked?

A

Backlash between trans drive gear and adapter housing gear
AND
backlash between the adapter housing gear and PTO input gear

41
Q

What will quickly fail a PTO?

A

Incorrect backlash adjustment

42
Q

If the tips of the gear teeth on a PTO are broken off, is the backlash correct, too much or too little?

A

Too much backlash

43
Q

If the gear teeth in a PTO are bluing, what was incorrect about the backlash? (too much or too little)?

A

Too little backlash - no room for lube or expansion

44
Q

If the drive load is too much for a PTO what is likely to happen?

A

Twisted shaft and sheared keys

Heavy Equipment Technician Period 4 (13 decks)

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