High-Range Clutch and Power Takeoff

2-2. High-Range Clutch and Power Takeoff

(fig. 2-l).

a. High-Range Clutch Components (fig. 2-1).

(1) The high-range clutch consists mainly of

housing (16), piston (15), piston return springs

(58), four internal-splined, bronze-faced steel

clutch plates, three external-tanged steel plates

(17), and a steel reaction plate.

(2) The housing (16) has a 6/8-pitch, 57-

tooth power takeoff drive gear, integrally machined

at its outer circumference. The housing has internal

splines in the hub which connects it to the turbine

shaft (59).

(3) The external-tanged clutch plates (17)

engage the housing (16). The internal-splined

plates engage a hub which is integral with the

intermediate-range planetary carrier (54).

b. Operation of High-Range Clutch (fig. 2-1).

(1) Power from the turbine (6) is transmitted

to the clutch housing (16) through the turbine shaft

(59) and the hub splines. When the clutch is

released, the housing and three external-tanged

clutch plates rotate but do not drive the four in-

ternal-splined plates. When the clutch is applied,

hydraulic pressure pushes the piston (15) rearward

and compresses all seven clutch plates against the

clutch reaction plate. This grips the internal-splined

plates and causes them to rotate with the external-

tanged plates and housing. The internal-splined

plates drive the intermediate-range planetary

carrier.

(2) The housing (16) rotates when the turbine

shaft (59) rotates. The shaft (59) rotates when the

turbine (6) rotates. Thus, the housing (16) can

rotate in neutral, reverse gear, or any forward gear

when engine power is applied through the converter

by speeding up the engine. For this reason the

power takeoff drive gear is part of the housing. Its

teeth mesh with a driven gear in the power take-off

assembly (or assemblies) which may be mounted on

either side of the housing (31).

(3) In high-range operation, torque is trans-

mitted at the same speed from the turbine shaft

(59) to the intermediate-range planetary carrier

assembly (54). The intermediate-range planetary

carrier (54) is attached to the low-range ring gear

(23). The low-range sun gear (46) is splined to the

turbine shaft (39). Thus, two members of the low-

range gear set are rotating at the same speed as the

high-range clutch. The third member (low-range

planetary carrier) is meshed with these two and,

therefore. must also rotate at the same speed. This

results in the transmission output shaft (33) being

driven at the same speed as the turbine shaft (59).

2-3