Checking Transmission Clutches With Air.

Figure 6-43. Removing transmission case.

d. Checking Transmission Clutches With Air.

(1) After assembly of a power shift trans-

mission (prior to installation of the transmission

case) each clutch piston can be checked with the aid

of a simple tool setup and compressed air. This

preliminary check points out assembly problems

which can be easily corrected at this stage, but are

very difficult to repair once the unit is installed in

the machine.

(2) The checking tool is fabricated from a

s l e e v e , seal, bushing, and pipe nipple, (fig. 6-43),

special

tool.

(3) The clutch packs can be checked, one at a

time, by inserting the tool sleeve into the inlet port

as shown in figure 6-44 and injecting air under

pressure.

If the clutch pistons are operating

inch -

properly, there should be approximately

inch travel in each piston, with very little

leakage. If any of the pistons fail to move, this is an

i n d i c a t i o n of binding and the transmission should

b e disassembled to determine the cause.

( 4 ) To check the input shaft seals, insert the

a i r tool into the opening shown in figure 6-44 and

inject air under pressure (not to exceed 80 psi).