Deck 15: Hydraulic System Rebuilding

Question 1

If the end play on a transmission is insufficient, there will be preload on the bearings inside the transmission. What problem may this cause?

A) Dragging of the clutch packs
B) Free spinning of the sprag
C) Fluid leakage from the pump
D) Fluid level too high

Answer 1

A

Question 2

Which of the following can be worn by metal check balls?

A) Valve body
B) Spool valves
C) Separator plate
D) Both A and C

Answer 2

D

Question 3

Where should compressed air should be used to ensure each fluid passage is clear and unobstructed?

A) Transmission case
B) Valve body
C) Input and output shafts
D) All of the above

Answer 3

D

Question 4

Technician A says all components of the oil delivery circuit in an automatic transmission must be inspected for debris during a transmission rebuild. Technician B says that this is not necessary since all debris would be captured by the transmission filter. Who is correct?

A) Technician A
B) Technician B
C) Both A and B
D) Neither A nor B

Question 5

What is used to measure the amount of warpage on the automatic transmission drum?

A) A digital vernier
B) A micrometer
C) A machinist's scale
D) A strait edge and feeler gauges

Question 6

Which of the following can cause discoloration of a band drum?

A) Leaking of transmission fluid
B) Cracking of the band lining
C) Band slippage
D) Dirt and grime

Question 7

Because most automatic transmissions have multiple clutches, it is good practice to rebuild _____, so that parts do not get interchanged.

A) Only one at a time
B) Pairs of two at a time
C) All of them at once
D) Any of the above

Question 8

What should the clutch drum should be checked for?

A) Cracks
B) Broken splines
C) Worn splines
D) All of the above

Question 9

Which of these is least likely to cause slippage in a multi-disc drum?

A) Failed lip seals
B) Insufficient clutch clearance
C) High line pressure
D) Incorrect band adjustment

Question 10

If clutch pack clearance is insufficient, what can happen?

A) The clutch may slip when applied
B) The clutch may drag when released
C) The transmission may bind
D) Both B and C

Question 11

When the clutch pack has excessive clearance, what can happen?

A) The clutch may slip when applied
B) The clutch may drag when released
C) The transmission may bind
D) Both B and C

Question 12

Technician A says when rebuilding an automatic transmission, there should be no clearance between the clutch plates. Technician B says when rebuilding an automatic transmission, the clutch pack clearance is best checked with a feeler gauge. Who is correct?

A) Technician A
B) Technician B
C) Both A and B
D) Neither A nor B

Question 13

Which of the following automatic transmission tests can check hydraulic circuits and components, such as clutches and servos, for leaks and proper movement?

A) Cooler flow test
B) Air check
C) Fluid check
D) Stall test

Question 14

Which of the following parts can be tested for proper function using compressed air?

A) Clutches and planetary gear sets
B) Servos and clutches
C) Clutches and one way clutches
D) Servos and pressure relief valves

Question 15

What must you ensure before air checking an automatic transmission clutch assembly?

A) The clutch pack assembled and the snap ring is fully engaged
B) The snap ring is not installed
C) The air pressure is at maximum
D) No seals are installed on the clutch piston

Question 16

Which of these should be used to identify fluid passages through the case when inspecting fluid delivery circuits?

A) Scan tool
B) Mirror and light
C) Transmission case diagram
D) Telescoping gauge

Question 17

A drum that is not badly scored (lightly worn) should:

A) still be replaced.
B) be refinished using emery cloth.
C) be used as is.
D) be used with more lubrication.

Question 18

If the clutch pack has too little clearance, the clutch:

A) will drag when it is disengaged.
B) may slip.
C) will have a very harsh engagement.
D) piston needs to be replaced.

Question 19

Technician A says that when rebuilding a multidisc clutch, the steels should be checked for flatness, and their thickness should be measured. Technician B says that it is common to reuse the clutch piston's lip seals. Who is correct?

A) Technician A
B) Technician B
C) Both A and B
D) Neither A nor B

Question 20

Technician A says that clutch pack clearance should be checked with a micrometer. Technician B says that any clearance in the clutch pack means that the clutch discs are worn out. Who is correct?

A) Technician A
B) Technician B
C) Both A and B
D) Neither A nor B

Question 21

Technician A says that after rebuilding a clutch, it needs to be air checked before the clutch plates are installed. Technician B says that clutches that are rebuilt outside of the transmission are typically air tested before installing them back in the transmission. Who is correct?

A) Technician A
B) Technician B
C) Both A and B
D) Neither A nor B

Question 22

Tech A states that the transmission can function without the front pump. Tech B states that without the front pump, the transmission cannot function. Who is correct?

A) Tech A
B) Tech B
C) Both A and
D) Neither A nor B

Question 23

Tech A states that front pump of a transmission needs to be disassembled and checked for wear separately. Tech B states that a severely worn pump will need replacement or needs to be rebuilt for the transmission. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 24

Tech A states that a gear and crescent pump needs little service when rebuilding a transmission. Tech B states that a gear and crescent pump is prone to heavy wear and needs replacement when a rebuilding a transmission. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 25

Identify the component that is removed first to disassemble a typical gear pump.

A) Front pump bushing
B) Rotor lobes
C) Sprocket bearing
D) Sealing rings

Question 26

The sealing rings of a typical gear pump can be made out of ________.

A) Teflon
B) aluminum
C) composites
D) steel

Question 27

Tech A states that all sealing rings use the same design. Tech B states that sealing rings can use several different designs. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 28

A gear pump that requires disassembly makes use of cast iron locking rings. Tech A states that the ring ends must be unlocked from each other. Tech B states that the ring must be expanded before it can be slid off of the pump. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 29

Identify the component that is being removed in the given figure.

A) Sealing ring
B) Front pump bushing
C) Accumulator spring
D) Alignment band

Question 30

Tech A states that most front pumps will only go together one way. Tech B states that it may take several tries to line up the bolt holes of a front pump. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 31

Tech A states that inscribing a small line on the side of the halves of a front pump will make reassembly easier. Tech B states that inscribing on the sides of the front pump will score the component. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 32

Tech A states that the pump gears of a front pump should be marked during disassembly. Tech B states that seals must be replaced during pump rebuild. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 33

Identify the tool that can be used to remove the front pump seal.

A) Impact gun
B) Seal puller
C) Slide hammer
D) Feeler gauge

Question 34

Identify the step that should be carried out before driving out the front pump bushing.

A) Clean the bushing in a solvent tank.
B) Air test the operation of the bushing.
C) Verify that there is no ridge located behind the bushing.
D) Use a feeler gauge to check the bushing clearance.

Question 35

Tech A states that the correct size bushing driver should be used to drive out a front pump bushing. Tech B states that all front pump bushings are of the same size and any bushing driver can be used to drive them out. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 36

If the bushing driver used to drive out a front pump bushing is too large, it may ________.

A) rotate in the wrong direction
B) prevent the bushing from being removed
C) jam into the bushing
D) damage the pump

Question 37

Tech A states that if the bushing driver used to drive out a front pump bushing is too small, it may prevent the bushing from being removed. Tech B states that a small bushing driver will jam into the bushing. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 38

A(n) ________ should be used to dry the parts of a front pump that have been cleaned in a solvent tank.

A) blow gun
B) dry cloth
C) impact gun
D) shop towel

Question 39

The ________ of a pump are used to connect the rotating parts inside the transmission and allow the transfer of hydraulic pressure to the correct components.

A) valves
B) sealing rings
C) servo bores
D) front pump bushings

Question 40

Tech A states that deep scores in the pump housing will cause a slight loss of hydraulic pressure. Tech B states that a deeply scored cast iron housing will require replacement. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 41

Identify the tool used to measure the clearance between the outer gear and the housing of a pump.

A) Micrometer
B) Vernier caliper
C) Feeler gauge
D) Dial gauge

Question 42

Tech A states that all valves must be removed from a front pump during an overhaul. Tech B says that pump valves should always be replaced. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 43

Which of these should be used to identify fluid passages through the case when inspecting fluid delivery circuits?

A) Scan tool
B) Mirror and light
C) Transmission case diagram
D) Telescoping gauge

Question 44

Viton seals require a surface that will retain oil in order to increase the life of the seal. This is achieved by:

A) making crosshatches on the surface.
B) lightly scuffing the surface using a Scotch-Brite pad.
C) applying sandpaper to the surface.
D) spraying adhesives over the surface.

Question 45

Tech A states that servos may have updated parts available from the transmission manufacturer or aftermarket sources. Tech B states that servo pistons are always replaced during an overhaul. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 46

Tech A states that servo bores must be perfectly smooth to prevent damaging the seals. Tech B states that the servo bore will need to be scuffed if the servo uses a Viton seal. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 47

If the clutch pack has too little clearance, the clutch:

A) will drag when it is disengaged.
B) may slip.
C) will have a very harsh engagement.
D) is of incorrect thickness.

Question 48

Which of the following tools is used to remove the bolts holding the two sides of the front pump together?

A) Pin punch
B) Impact gun
C) Slide hammer
D) Seal puller

Question 49

Be careful when removing valves because:

A) they are easily breakable.
B) removing them may damage other parts.
C) they typically have springs located behind them.
D) they cannot be reassembled easily.

Question 50

Which of the following should always be replaced when rebuilding a transmission, irrespective of its condition?

A) Sealing ring groove
B) Housing
C) Pump gear
D) Front pump bushing

Question 51

Tech A states that front pump bushings must be replaced. Tech B states that pump bushings may have to be pressed, or pulled out of the pump. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 52

Tech A states that if there is light wear in the front pump housing the housing may be able to be repaired using a sharpening stone. Tech B states that the entire pump must be replaced. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 53

All of the following tools are used in the inspection of a gerotor pump except:

A) a pressure gauge.
B) a feeler gauge.
C) a micrometer.
D) a digital caliper.

Question 54

Tech A states that on a vane pump the vanes must be replaced during an overhaul. Tech B states that gear pumps do not require any service. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 55

Choose the correct statement with respect to rebuilding a variable displacement vane pump.

A) The vanes removed from the rotor need not go back in the same direction.
B) A variable displacement vane pump has significantly more components that need to be inspected and repaired.
C) The sealing rings, rotor, and slide are very robust and are not easily damaged when dropped.
D) The bushings inside the stator shaft should always be replaced.

Question 56

Which of the following is the best method for inspecting the valves in a pump?

A) Vacuum testing
B) Air testing
C) Solvent testing
D) Lube testing

Question 57

Tech A states that pump gears must be reinstalled in the same direction when rebuilding a pump. Tech B says that pump vanes must be installed in the same direction as they were removed. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 58

All of the following statements with respect to rebuilding an electric pump are true except:

A) The megohmmeter will only use lower voltage when testing the insulation.
B) Do not touch the component while pressing the test button on the megohmmeter.
C) Measure the resistance of each of the phase windings.
D) If any of the tests were not within specification, the entire pump and motor assembly will need to be replaced.

Question 59

Tech A states that there is no difference between an electric transmission pump and a gerotor pump. Tech B states that the electric pump is often used on high voltage hybrid vehicles that require special service techniques. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 60

Tech A states that you should not touch the component being tested with the megohmmeter. Tech B states that you need to wear high voltage gloves while testing a component with the megohmmeter. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 61

Tech A states that check valves can be pressure tested with a blow gun. Tech B states that a check valve can be checked with solvent to see if it is leaking. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 62

Tech A states that the transmission can function without the front pump. Tech B states that without the front pump, the transmission cannot function. Who is correct?

A) Tech A
B) Tech B
C) Both A and
D) Neither A nor B

Question 63

Tech A states that front pump of a transmission needs to be disassembled and checked for wear separately. Tech B states that a severely worn pump will need replacement or needs to be rebuilt for the transmission. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 64

Tech A states that a gear and crescent pump needs little service when rebuilding a transmission. Tech B states that a gear and crescent pump is prone to heavy wear and needs replacement when a rebuilding a transmission. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 65

Identify the component that is removed first to disassemble a typical gear pump.

A) Front pump bushing
B) Rotor lobes
C) Sprocket bearing
D) Sealing rings

Question 66

The sealing rings of a typical gear pump can be made out of ________.

A) Teflon
B) aluminum
C) composites
D) steel

Question 67

Tech A states that all sealing rings use the same design. Tech B states that sealing rings can use several different designs. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 68

A gear pump that requires disassembly makes use of cast iron locking rings. Tech A states that the ring ends must be unlocked from each other. Tech B states that the ring must be expanded before it can be slid off of the pump. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 69

Identify the component that is being removed in the given figure.

A) Sealing ring
B) Front pump bushing
C) Accumulator spring
D) Alignment band

Question 70

Tech A states that most front pumps will only go together one way. Tech B states that it may take several tries to line up the bolt holes of a front pump. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 71

Tech A states that inscribing a small line on the side of the halves of a front pump will make reassembly easier. Tech B states that inscribing on the sides of the front pump will score the component. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 72

Tech A states that the pump gears of a front pump should be marked during disassembly. Tech B states that seals must be replaced during pump rebuild. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 73

Identify the tool that can be used to remove the front pump seal.

A) Impact gun
B) Seal puller
C) Slide hammer
D) Feeler gauge

Question 74

Identify the step that should be carried out before driving out the front pump bushing.

A) Clean the bushing in a solvent tank.
B) Air test the operation of the bushing.
C) Verify that there is no ridge located behind the bushing.
D) Use a feeler gauge to check the bushing clearance.

Question 75

Tech A states that the correct size bushing driver should be used to drive out a front pump bushing. Tech B states that all front pump bushings are of the same size and any bushing driver can be used to drive them out. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 76

If the bushing driver used to drive out a front pump bushing is too large, it may ________.

A) rotate in the wrong direction
B) prevent the bushing from being removed
C) jam into the bushing
D) damage the pump

Question 77

Tech A states that if the bushing driver used to drive out a front pump bushing is too small, it may prevent the bushing from being removed. Tech B states that a small bushing driver will jam into the bushing. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 78

A(n) ________ should be used to dry the parts of a front pump that have been cleaned in a solvent tank.

A) blow gun
B) dry cloth
C) impact gun
D) shop towel

Question 79

The ________ of a pump are used to connect the rotating parts inside the transmission and allow the transfer of hydraulic pressure to the correct components.

A) valves
B) sealing rings
C) servo bores
D) front pump bushings

Question 80

Tech A states that deep scores in the pump housing will cause a slight loss of hydraulic pressure. Tech B states that a deeply scored cast iron housing will require replacement. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B