Figure 27-6. Transfer Assembly Sprag Unit.

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Section IV. POSITIVE TRACTION TRANSFER CASE

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TM-9-8000 Principles of Automotive Vehicles Manual

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Figure 27-7. Positive Traction Transfer Case Operation.

TM 9-8000

Figure 27-6. Transfer Assembly Sprag Unit.

b. Air-Operated Shift Control Figure 27-7 shows the

figure 27-8 is the air-control diagram of the transmission

power flow in the transfer unit using the air-controlled

and transfer assembly using an air-controlled double-

double-sprag unit. The double-sprag unit has the same

sprag unit. When the transmission is in neutral or a

function as that described in paragraph 27-9, the basic

forward gearshift position, and there is compressed air in

difference being that there is an air valve on the

the compressed air system of the vehicle, the air cylinder

transmission low-and reverse-shifter shaft, which

control valve (1, fig. 27-8) will be positioned to admit air

automatically shifts the sprag unit to forward or reverse

under pressure from the compressed air system into the

whenever the main transmission is shifted to forward or

shift air cylinder assembly (8, fig. 27-8). The air then is

reverse.

admitted to the forward-shift side of the spring-balanced

piston in the cylinder. The piston then is moved,

c. Air-Operated Shifter Operation. Shown in

TA233766

27-7