Check the pump pressure. See figure 4-9.

check the regulator valve spring and spool for free

(5) When installing the forward shaft (8),

operation or damage and check for restricted lines

forward gear (7) and reverse gear (13), ensure that

and passages. If the pump pressure is below 100

the snap rings (5, 9, 10 and 11) are properly in-

psi, check for low oil level, a faulty pump, excessive

stalled and completely seated. Refer to figure 4-8

line leakage, a f a u l t y r e g u l a t o r v a l v e , f a u l t y

for forward gear and shaft installation.

directional valve, or a clogged filter screen.

ME 3930-624-34/4-8

Figure 4-9. Checking pump and converter pressure.

Figure 3-8. Installing forward gear and shaft.

(2) Check the converter pressure. See figure 4-

(6) When installing the converter housing and

disc drum to the transmission, be careful not to

(a) Install a pressure gage, calibrated to 300

damage the seal rings on the disc drum assembly.

psi, in the converter supply pressure port on the

e. Installation. Install the transmission in the

pump adapter.

(b) Leave the transmission in neutral and

truck. Refer to paragraph 2-9.

f. Testing. The transmission depends on correct

start the engine. Accelerate the engine to its full

operating pressures for efficient operation. The

governed speed (2200 rpm). Note the pressure

pressures to be checked are: pump pressure,

indicated on the pressure gage.

converter pressure, forward and reverse clutch

(c) If the converter pressure is 65 psi to 100

pressures (stalled and free running), inching

psi maximum, the converter is in normal operating

pressure, and clutch cooling oil pressure. The oil

condition. With the engine idling at 500 rpm, the

temperature should be 80 to 100F, except where

converter pressure should be between 10 psi and 30

otherwise specified.

psi.

(d) lf the converter pressure is above 100 psi

(1) Check the pump pressure. See figure 4-9.

(a) Install a pressure gage calibrated to 300

at 2200 rpm, check for excessive pump pressure,

psi. i n t h e p u m p p o r t o n t h e c o n v e r t e r p u m p

enlarged metering orifice, or restricted converter

adapter.

return passages. If the pressure is below 65 psi,

(b) Leave the transmission in neutral and

check for low oil level, clogged filter screen, faulty

start the engine. Accelerate the engine to its full

pump, or clogged converter orifice in pump

governed speed. Note the pressure indicated on the

collector ring.

pressure gage.

(3) Check the forward and reverse clutch

(c) If the pump pressure is between 100 psi

pressures at stall.

(a) Install a pressure gage, calibrated to 300

and 140 psi the pump is in normal operating

condition.

psi, in the clutch pressure port. See figure 4-10.

(d) If the pump pressure is over 150 psi,

4-7