Transmission Fundamentals "B - Aux Box"

Question 1

What are the different speed options of a Aux section

Answer 1

2 speed
3 speed
4 speed

Question 2

The aux section is generally shifted with?

Answer 2

Air

Question 3

The splitter and deep reduction shift is ___________.

Answer 3

Non-synchronized

Question 4

The range shift often utilizes?

Answer 4

A synchro

Question 5

Aux drive gear

Answer 5

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

Question 6

Aux countershafts

Answer 6

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

Question 7

The range shifter is normally which piston

Answer 7

Top when viewed from back

Question 8

The electronics used for speedo and electronic shift are?

Answer 8

J1939

Question 9

A 15 speed has how many useable gears?

Answer 9

12

Question 10

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

Answer 10

Operating and ambient temperature

Question 11

Oil level in a trans should be how deep?

Answer 11

Within 7/8 inch of top of lower counter shaft

Question 12

What is often used to aid in splash lube?

Answer 12

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

Question 13

Trans pumps are driven off of?

Answer 13

The upper countershaft pto gear

Question 14

Mack oil pump

Answer 14

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

Question 15

A trans filter should always be located where?

Answer 15

In the hot side of the system

Question 16

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

Answer 16

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

Question 17

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

Answer 17

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

Question 18

What are 4 common options for trans oil?

Answer 18

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

Question 19

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

Answer 19

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

Question 20

What are the 2 classes of hybrids?

Answer 20

Full

Mild

Question 21

What are the 2 types of hybrid architectures?

Answer 21

Series

Parallel

Question 22

Series hybrid vehicles

Answer 22

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)

Question 23

Parallel hybrid

Answer 23

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

Question 24

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

Answer 24

Motor/generator
Inverter
Power electronics carrier (PEC)

Question 25

Hybrid motor/generator

Answer 25

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

Question 26

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

Answer 26

340 V AC 3 phase power

Question 27

Hybrid inverter

Answer 27

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

Question 28

Hybrid PEC

Answer 28

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

Question 29

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

Answer 29

7.2V - 7.8V as per class

Question 30

The hybrid system runs what network?

Answer 30

Requires the use of the 500 Kb/s J1939

Question 31

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

Answer 31

Electric only Diesel electric Diesel only

Question 32

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

Answer 32

Running at idle, the clutch is disengaged

Question 33

Regenerative braking

Answer 33

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

Question 34

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

Answer 34

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

Question 35

Diesel hydraulic hybrid

Answer 35

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

Question 36

Hydraulic hybrid transfer case

Answer 36

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

Question 37

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

Answer 37

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

Question 38

The HLA will disengage if? (4)

Answer 38

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

Question 39

The pressure in the HLA accumulator can reach?

Answer 39

5000 PSI

Question 40

Regenerative braking will automatically shut off when? (3)

Answer 40

Accumulator is fully charged ABS event occurs A fault occurs

Question 41

How are high voltage cables identified?

Answer 41

Orange in colour

Question 42

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

Answer 42

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

Question 43

High voltage safety gloves

Answer 43

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.

Question 44

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

Answer 44

High range, high split

Question 45

How should you check the oil level in the transmission?

Answer 45

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

Question 46

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

Answer 46

Transfer case