CHECKS

TRANSMISSION

the plug at pressure check port No. 1. (Fig. 42)

Fill

2. With the transmission in gear, apply full throttle

this port with oil to furnish initial pump lubrication.

and check engine speed with the truck stationary.

CAUTION:

Under no circumstances apply full

throttle longer than 30 seconds.

Otherwise the torque converter may

become overheated and possibly

damaged.

3. If the engine and converter are in good

condition, the stall speed should be within 100 RPM of

the specified stall speed of a given truck. Refer to the

Engine Section for stall speeds.

4. If the stall speed is 100 or 300 RPM slower than

that specified, it is a general indication that engine

performance is down.

Check carburetion, timing,

valves, etc.

5. If the stall speed is 400-500 RPM slower than

that specified and the engine is in good condition, the

Figure 41.

converter stator is slipping and entire converter

assembly must be replaced.

6. If the stall speed is more than 100 RPM higher

than the specified speed, it is an indication that the

clutch pack is slipping.

CONTROL VALVE

The control valve may be removed by disconnecting the

attaching hoses and disconnecting the linkage from the

directional spool, (Fig. 43) Remove the five capscrews

that hold the control valve to the transmission housing.

Hold the control valve in place while removing the last

capscrew, as the seat for the converter outlet check ball

is behind the control valve. Slide the control valve away

from the housing, being careful not to lose the ball from

this check valve. The porting plate may be removed to

Figure 42.

complete the disassembly. (Fig. 44)

F. CHECKS

1. With the truck thoroughly warmed-up, put a load

on the forks and set the emergency brake.

NOTE:

It may be necessary to run the truck

against some heavy object to prevent

it from moving while making the test.

B-109