HOUSING 7V4394 - Caterpillar

Table 1
Required Tools    
Part Number    Part Description    Qty    
9U-7400     Multitach     1    
    Stopwatch     1    
Place the machine on level ground and stop the engine.
Install 9U-7400 Multitach on the lower carriage in order to check the drive shaft speed.
Attach a reflective tape to the drive shaft.
Start the engine.
Lower the left console.
Place the engine speed dial at the HIGH IDLE position.
Fully move the stick several times until the normal hydraulic oil temperature of 55° 5°C (131° 9°F) is reached.
Illustration 1 g00294504
Lower the stabilizer, the blade tip, and/or the implement in order to raise the front axle and the rear axle. This will allow the wheels to turn freely. All tires must be off the ground.
Place the machine in second gear. Place the engine speed dial at the HIGH IDLE position.
Depress the travel pedal for FORWARD travel. Allow the machine to operate in forward travel for one minute in order to stabilize the drive shaft speed.
Measure drive shaft speed.
Depress the travel pedal for REVERSE travel. Allow the machine to operate in reverse travel for one minute in order to stabilize the drive shaft speed.
Measure drive shaft speed.
If the drive shaft speed is not set to the proper specification, stop the engine. Refer to Table 2 for specifications for drive shaft speeds.
Illustration 2 g00665352
Travel motor (A) Adjustment screw (Qmin) (B) Adjustment screw (Qmax) (Y) Length of adjustment screw (A) (Z) Length of adjustment screw (B)
Check adjustment screw (A) and (B) on the travel motor. Refer to Illustration 2. Make sure that dimension (Y) is 9.2 mm (0.36 inch). Make sure that dimension (Z) is 18 mm (0.71 inch).
If the adjustment screws are not set properly, correct the adjustment before performing the following steps.
If an adjustment was necessary, repeat steps 4 through 13. If no adjustment was necessary, proceed to step 18.
Illustration 3 g00447165
(1) Cap (2) Locknut
Remove cap (1) and loosen the locknut (2) .
Illustration 4 g00434791
(3) Adjustment screw (forward travel) (4) Adjustment screw (reverse travel)Note: For the initial values of dimension (X), refer to Testing and Adjusting, "Main Control Valve - Adjust".
Turn adjustment screw (3) or (4) on the main control valve in order to set the proper drive shaft speed. Refer to Table 2.
Table 2
Drive Shaft Speed (1)    
Gear    Ground Speed (2)    Shaft Speed    
First Gear (Forward Creeper Speed)    
4 km/h (2.5 mph)     370 to 390 rpm    
Second Gear (Forward Creeper Speed)    
16 km/h (10 mph)     1490 to 1530 rpm    
First Gear (Forward)    
10 km/h (6 mph)     930 to 960 rpm    
Second Gear (Forward) (3)    
34 km/h (21 mph)     3110 to 3160 rpm    
Second Gear (Forward)    
20 km/h (12 mph)     1879 to 1910 rpm    
First Gear (Reverse)    
6 km/h (4 mph)     560 to 580 rpm    
Second Gear (reverse)    
20 km/h (12 mph)     1870 to 1910 rpm    
( 1 ) The specifications are for a machine with the wheels