Testing and Adjusting 784C and 785C Off-Highway Truck/Tractors Power Train, страница 2

Parking and Secondary Brake Valve

Parking brake release pressure at high idle ... 4690 ± 200 kPa (680 ± 29 psi)

Parking Brake Release Hydraulic Filter

Pressure setting for the bypass valve ... 248 ± 21 kPa (36 ± 3 psi)

Lockup Clutch and Synchronizing Valve

Pressure Reduction Valve

Pilot pressure at low idle ... 1725 ± 70 kPa (250 ± 10 psi)

Table 5

Chart of Shims for the Pressure Reduction Valve    

Pt. No. for the Shims    

Thickness of the Shims    

Change in Primary Pressure as a result of one Shim    

5J-2721 Shim    

.13 mm (0.005 inch)    

10 kPa (1.4 psi)    

6J-3993 Shim    

.25 mm (0.01 inch)    

19 kPa (2.8 psi)    

5J-1036 Shim    

.80 mm (0.031 inch)    

60 kPa (8.7 psi)    

Modulation Reduction Valve

Pressure at low idle ... 2135 ± 70 kPa (310 ± 10 psi)

Minimum pressure at 1300 rpm ... 2135 kPa (310 psi)

Lockup clutch primary pressure at low idle ... 1030 ± 35 kPa (150 ± 5 psi)

Table 6

Chart of Shims for the Modulation Reduction Valve (1)    

Pt. No. for the Shims    

Thickness of the Shims    

Change in Primary Pressure as a result of one Shim    

8J-4452 Shim    

.12 mm (0.005 inch)    

10 kPa (1.4 psi)    

2S-0675 Spacer    

.40 mm (0.016 inch)    

32 kPa (4.6 psi)    

9J-1330 Shim    

.79 mm (0.031 inch)    

62 kPa (8.9925 psi)    

( 1 )

Before an adjustment is performed, be certain that the valve springs are not weak or broken.

Table 7

Speed    

Engaged Clutches    

Torque Converter Drive    

Direct Drive (Engaged Lockup Clutch)    

Neutral-1    

3    

X    

-    

Neutral-2    

1    

X    

-    

Reverse    

1 and 6    

X    

-    

First Gear    

1 and 5    

X    

X    

Second Gear    

2 and 5    

-    

X    

Third Gear    

1 and 4    

-    

X    

Fourth Gear    

2 and 4    

-    

X    

Fifth Gear    

1 and 3    

-    

X    

Sixth Gear    

2 and 3    

-    

X    

Transmission

Pressure Control Valve