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Transmissions > Transmission Fundamentals "B - Aux Box" > Flashcards

Transmission Fundamentals "B - Aux Box" Flashcards

1
Q

What are the different speed options of a Aux section

A

2 speed
3 speed
4 speed

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2
Q

The aux section is generally shifted with?

A

Air

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3
Q

The splitter and deep reduction shift is ___________.

A

Non-synchronized

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4
Q

The range shift often utilizes?

A

A synchro

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5
Q

Aux drive gear

A

Mounted to the part of the main shaft that extends into the aux section. May be splined to shaft or it may be floating

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6
Q

Aux countershafts

A

Are mounted on two tapered roller bearings. Subject to higher torque loads the main section and as a result are made of helical cut gears

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7
Q

The range shifter is normally which piston

A

Top when viewed from back

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8
Q

The electronics used for speedo and electronic shift are?

A

J1939

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9
Q

A 15 speed has how many useable gears?

A

12

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10
Q

What is most important factor to consider when choosing and trans oil?

A

Operating and ambient temperature

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11
Q

Oil level in a trans should be how deep?

A

Within 7/8 inch of top of lower counter shaft

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12
Q

What is often used to aid in splash lube?

A

Galleries are often cast into the housing to help direct oil to the critical areas, Bolt on troughs are also used to direct oil to critical areas

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13
Q

Trans pumps are driven off of?

A

The upper countershaft pto gear

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14
Q

Mack oil pump

A

trough catches splash oil and directs it into the pump, the pump pushes the oil through the mainshaft to the synchro assm in rear

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15
Q

A trans filter should always be located where?

A

In the hot side of the system

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16
Q

When a trans is not equipped with a internal pump, how can an optional external pump be added?

A

Some mounted to the PTO openings, Others are clamped or bolted to the end of the aux countershaft

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17
Q

What are different ways that trans oil can be filtered? (3)

A

Magnetic drain plugs/magnets glued to housing
Mesh strainers on pump inlet
Optional filters

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18
Q

What are 4 common options for trans oil?

A

Mineral gear (GL-5)
Synthetic gear (commonly 50 weight)
Engine oil
ATF

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19
Q

What can happen if trans is ran when over full of oil?

A

Oil foaming as well as overheating. Air bubbles entrapped in the lube reduces the lube qualities

20
Q

What are the 2 classes of hybrids?

A

Full

Mild

21
Q

What are the 2 types of hybrid architectures?

A

Series

Parallel

22
Q

Series hybrid vehicles

A

Engine never directly powers the vehicle. Engine is connected in series with a device that provides power to propel the vehicle down the road.
(Trains, haul truck)

23
Q

Parallel hybrid

A

Electric motor or hydraulic motor are sandwiched between the engine and transmission. The engine and alternate power are both capable of driving the trans and propelling the vehicle

24
Q

What are the 3 key components of the electric portion of the diesel - electric hybrid?

A

Motor/generator
Inverter
Power electronics carrier (PEC)

25
Q

Hybrid motor/generator

A

Is an AC brushless permanent magnet induction motor. A motor when used to propel the vehicle, a generator that charges the batteries during deceleration

26
Q

What is the voltage used and produced by the hybrid motor generator?

A

340 V AC 3 phase power

27
Q

Hybrid inverter

A

Converts the AC power generated by motor to DC to charge the batteries, Converts DC back to AC when powering the vehicle

28
Q

Hybrid PEC

A

Contains the Battery pack, Connectors (high and low voltage), air filter, and relay box. Commonly also has a fan to help regulate temp inside

29
Q

What is the voltage in each cell of the hybrid PEC battery?

A

7.2V - 7.8V as per class

30
Q

The hybrid system runs what network?

A

Requires the use of the 500 Kb/s J1939

31
Q

What are the 3 methods of propulsion in the parallel diesel electric hybrid?

A

Electric only
Diesel electric
Diesel only

32
Q

What is the status of the diesel motor in electric only mode?

A

Running at idle, the clutch is disengaged

33
Q

Regenerative braking

A

When hybrid system is charging by use of the slowing vehicle. Resistance from charging is used to brake the vehicle in addition to the normal service brakes

34
Q

What are considered 3 external additional advantages of the diesel electric hybrid?

A

Allows 120V AC equipment to be plugged into the hybrid electrical circuits
Electric run PTO
Start the diesel motor by use of the hybrid system over 12V system

35
Q

Diesel hydraulic hybrid

A

Is a hybrid system that uses a transfer case, hydraulic pump, accumulators and a reservoir to provide an assist in acceleration at low speeds

36
Q

Hydraulic hybrid transfer case

A

When disengaged the power flows through, when engaged to motor pump either assist in powering or charges the accumulator

37
Q

What conditions must be met in order for the hydraulic assist system to become active? (4)

A

Speed between 5 and 35 kph
Accumulator pressure is adequate to propel vehicle
No system faults exist
Reservoir contains adequate oil supply for the pump

38
Q

The HLA will disengage if? (4)

A

Operator activates cruise
Trans is shifted into neutral
There is a system fault
Vehicle speed exceeds 40 kph

39
Q

The pressure in the HLA accumulator can reach?

A

5000 PSI

40
Q

Regenerative braking will automatically shut off when? (3)

A

Accumulator is fully charged
ABS event occurs
A fault occurs

41
Q

How are high voltage cables identified?

A

Orange in colour

42
Q

What must be done prior to servicing a diesel electric hybrid?

A

Set up a 1 meter buffer zone with cones and tape around the vehicle

43
Q

High voltage safety gloves

A

Used with cotton and leather gloves, have a safety rating of 5:1, class 00 are min required, have to be re-certified every 6 months, should be air leak checked before each use.

44
Q

What aux box position provides direct drive in 4 speed aux?

A

High range, high split

45
Q

How should you check the oil level in the transmission?

A

Vehicle on the level ground, clean area around plug, ensure that the oil is level with the lower edge of plug opening

46
Q

In a diesel hydraulic hybrid, which component receives energy from the engine or the rear axle?

A

Transfer case

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