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Drivetrains Test > Planetary powershifts - 8 & 15 Speed > Flashcards

Planetary powershifts - 8 & 15 Speed Flashcards

1
Q

When was the 8 speed planetary powershift transmission introduced by Deere?

A

The 8 speed planetary powershift transmission was introduced in 1964.

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2
Q

What was notable about the 8 speed planetary powershift transmission?

A

It was quite revolutionary for its time.

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3
Q

In which tractors was the 8 speed planetary powershift transmission more popular?

A

It was more popular in lower horsepower tractors such as 3020’s and 4020’s.

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4
Q

Which series of tractors also had powershift transmissions?

A

Some 30 and 40 series tractors had powershift transmissions.

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5
Q

What was the only transmission option in a 4840 tractor?

A

In a 4840 tractor, the PST was the only transmission option.

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6
Q

What was a limitation of the 8 speed planetary powershift transmission?

A

With only 8 speeds, gear selection tended to be a bit limited.

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7
Q

Until when was the 8 speed planetary powershift transmission used?

A

The 8 speed was used until the introduction of the 50 series.

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8
Q

What transmission was introduced with the 50 series?

A

The 15 speed planetary PST was introduced.

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9
Q

What percentage of 50, 55, and 60 series tractors were sold with a powershift transmission?

A

The majority of all 50, 55, and 60 series tractors were sold with a powershift transmission.

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10
Q

What was the only transmission option on all larger models of tractors?

A

On all larger models, the PST was the only option.

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11
Q

How popular was the planetary powershift transmission designed by Deere?

A

This design proved to be one of the most popular transmissions built by Deere.

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12
Q

What is the basic layout of the John Deere 8 Speed PST transmission?

A

The John Deere 8 Speed PST transmission consists of two traction clutches and a multiple compound output planetary.

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13
Q

How many forward and reverse speeds does the John Deere 8 Speed PST transmission provide?

A

It provides 8 forward speeds and 4 reverse speeds.

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14
Q

What components contribute to the speed variations in the John Deere 8 Speed PST transmission?

A

The different combinations of brakes and clutches in the planetary pack, plus the engagement of one or both traction clutches.

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15
Q

What is the basic layout of the 8 Speed PST?

A

The basic layout includes the following positions: C3, B4, B3, B2, B1, PTO, C2, C1.

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16
Q

What is the connection between the engine and the transmission in a torsion dampened disc system?

A

The only connection to the engine is a single torsion dampened disc.

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17
Q

What feature did early tractors have for transmission control?

A

Early tractors had a hand operated mechanical linkage.

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18
Q

What was the purpose of the mechanical linkage in early tractors?

A

It allowed the transmission to be isolated from the engine.

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19
Q

What transmits engine power to the clutch pack assembly?

A

Engine power is transmitted from the torsional damper to the clutch pack assembly.

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20
Q

How many hydraulically actuated clutches are in the clutch pack?

A

The clutch pack contains three hydraulically actuated clutches.

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21
Q

Do the clutches in the clutch pack operate together or independently?

A

All clutches operate independently of each other.

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22
Q

What does the PTO clutch do?

A

The PTO clutch transmits power to the PTO driveline.

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23
Q

What are the functions of the C1 and C2 clutches?

A

The C1 & C2 clutch are used for the powershift transmission.

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24
Q

What is the function of the C1 clutch?

A

C1 is the low range clutch.

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25
Q

What is the function of the C2 clutch?

A

C2 is the high range clutch.

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26
Q

Can C1 and C2 clutches be engaged separately?

A

C1 or C2 may be engaged separately, or they may be engaged at the same time depending on selected gear.

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27
Q

What do the shafts exiting from the C1 & C2 clutch become?

A

The two shafts exiting from the C1 & C2 clutch become the inputs to the planetary pack.

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28
Q

Where is the planetary pack located?

A

The planetary pack is located in the main section of the transmission and contains additional elements.

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29
Q

What does the planetary pack receive powerflow from?

A

The planetary pack receives powerflow from the clutch pack.

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30
Q

How many brakes and clutches does the planetary pack contain?

A

The planetary pack contains four brakes and one clutch.

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31
Q

What are B1 and B2 classified as?

A

B1 and B2 are classified as reduction brakes.

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32
Q

What is B3 in the planetary pack?

A

B3 is the reverse brake.

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33
Q

What is B4 in the planetary pack?

A

B4 is the overdrive brake.

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34
Q

What is C3 in the planetary pack?

A

C3 is the direct drive clutch.

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35
Q

How are the planet pinions mounted in the planetary pack?

A

All planet pinions shown are mounted to the same planetary carrier assembly - multiple compound planetary.

36
Q

What does the output shaft from the planetary pack drive?

A

The output shaft from the planetary pack drives the differential drive shaft through a reduction gear set.

37
Q

What is the operating speed of the transmission components?

A

The operating speed of the transmission components is relatively high to reduce torque loads.

38
Q

What additional function does the reduction gear set serve?

A

The reduction gear set also serves as a drop down to align the transmission shaft with the differential.

39
Q

What are the two main sections of the 8 Speed PST transmission?

A

The two main sections are the input section and the output section.

40
Q

What elements make up the input section of the 8 Speed PST transmission?

A

The input section consists of C1, C2, B1, and B2.

41
Q

What elements make up the output section of the 8 Speed PST transmission?

A

The output section consists of B3, B4, and C3.

42
Q

How many elements are required to complete powerflow in the 8 Speed PST?

A

Two elements are required from the input section and one from the output section.

43
Q

What is the role of the compound planetary carrier in the 8 Speed PST?

A

The compound planetary carrier is the output from the input section and becomes the input to the output section.

44
Q

How can the input and output sections be visually separated?

A

A vertical line can be drawn between the B2 and B3 ring gears, with the front half as input and the rear half as output.

45
Q

How many different input ratios can be provided to the planetary carrier?

A

A combination of two of the various input elements will provide five different input ratios to the planetary carrier.

46
Q

What is required to complete powerflow in the 8 Speed PST operation?

A

One element from the output section must also be used.

47
Q

In which direction are C3 and B4 used?

A

C3 and B4 are only used in forward.

48
Q

What happens when C3 is engaged?

A

The B3 and B4 sun are locked together.

49
Q

What is the relationship between the output shaft and the carrier?

A

The output shaft is ‘locked’ to the carrier - direct drive.

50
Q

What occurs when B4 is engaged?

A

The B4 sun is held, and powerflow is transmitted from the carrier, through the compound planet pinions, to the B3 sun gear - overdrive.

51
Q

When is B3 used?

A

B3 is only used for reverse.

52
Q

What happens when B3 is engaged?

A

The planet pinions in mesh with the ring are forced to rotate in the opposite direction - reverse.

53
Q

How does power flow move when B3 is engaged?

A

Power flow is then moved through the double pinions and causes the B3 sun to rotate in the opposite direction of input.

54
Q

What is common to the first four forward speeds?

A

C3 is common to the first four forward speeds.

55
Q

How is the input ratio determined?

A

The input ratio is determined by using a combination of Cia as well as B1 & B2.

56
Q

What is the output in 5t?

A

In 5t, the overdrive output is used with a slower input speed to achieve the desired overall ratio.

57
Q

What is the output in F6?

A

In F6, the overdrive output is used along with a little faster input; the overall ratio through the transmission is still an underdrive.

58
Q

What is the ratio through the transmission in F7?

A

In F7, the ratio through the transmission is direct drive.

59
Q

What is the overall trans ratio in F8?

A

In F8, the overall trans ratio is an overdrive.

60
Q

What brake is used when any reverse speed is selected?

A

When any reverse speed is selected, the B3 brake is used.

61
Q

What is the sequence of input elements used for reverse?

A

The input elements used for reverse are in the same sequence as the first four forward gears.

62
Q

How many reverse gears are theoretically available?

A

Theoretically, the number of reverse gears available is not specified in the provided text.

63
Q

What type of transmission does the 40 Series John Deere have?

A

The 40 Series John Deere features an 8-speed powershift transmission.

64
Q

What is the role of the shift valve in the 40 Series John Deere transmission?

A

The shift valve provides control of oil flow to and from a variety of main shift valves.

65
Q

What components are responsible for metering oil flow in the 40 Series John Deere transmission?

A

A variety of metering orifices/valves and a pair of accumulators are responsible for metering the oil flow.

66
Q

What is the purpose of metering oil flow in the transmission?

A

It provides satisfactory shifting during operation.

67
Q

What will be studied regarding the 40 Series John Deere transmission?

A

Only a portion of the system will be studied to show the differences and similarities between mechanically controlled systems and electronically controlled systems.

68
Q

What regulates the pressure oil supplied to the shift valves in 4th speed forward?

A

Transmission regulated pressure oil is supplied from three locations: the clutch pedal valve, regulated pressure oil from the filter through the accumulator circuits, and regulated pressure oil from the direction valve.

69
Q

What additional oil is supplied in the 4th speed forward transmission?

A

Pilot oil from the speed selector valve.

70
Q

What are the functions of the two accumulators in the system?

A

They assist with the initial rapid filling of the element and slow down the final engagement of the element.

71
Q

What controls the speed of element disengagement?

A

The dump valve.

72
Q

Where can one find clarification on the oil flow in the system?

A

Refer to the schematic diagram.

73
Q

What is the Powershift Transmission Schematic for?

A

It is for the 40 Series Deere - 8 Speed PST.

74
Q

What is required to engage a Speed Forward?

A

Oil low.

75
Q

What are the elements required for the Powershift Transmission?

A

02, B3, C3.

76
Q

What is the role of the accumulator during a shift?

A

The accumulator helps regulate oil flow and pressure changes during gear shifts.

77
Q

What happens when a change is made from 1st gear to 2nd gear?

A

The B1 element must be disengaged and the B2 element must be applied.

78
Q

What does pilot oil from the speed selector valve do?

A

It is routed to the B1 B2 shift valve, causing it to move down.

79
Q

What occurs when there is an open path for oil to flow into the B2 element?

A

The pressure in the circuit will drop.

80
Q

What does the drop in pressure cause in the B1 B2 accumulator?

A

It allows regulated oil and accumulator oil to flow to B2.

81
Q

What happens after the initial quick fill is complete?

A

The pressure in the system begins to increase.

82
Q

What effect does increasing pressure have on the accumulator?

A

The accumulator shifts to the left, restricting the flow of regulated oil.

83
Q

How does the B1 B2 accumulator help control engagement speed?

A

It is being recharged, which helps control the speed of engagement.

84
Q

What happens to the dump valve when system pressure drops?

A

The pressure holding the dump valve open is reduced, allowing spring pressure to partially close it.

85
Q

What is the effect of the dump valve partially closing?

A

It slows the release of the offcoming element.

86
Q

What occurs when pressure increases again in relation to the dump valve?

A

The dump valve is forced to its wide open position, allowing the element to fully disengage.

Drivetrains Test (4 decks)

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