MIDROLLER AS 1R1191 - Caterpillar

To prevent personal injury when checks are made while the machine is in operation, make sure only approved personnel are on the machine. Keep other personnel off the machine and in view of the operator. Make sure checks are done in an open area.
Specifications
Table 1
Sprocket Speed Check
Date
- Product or Component SN
-
Item Specification Actual
Engine speed High Idle
STEER RIGHT RPM of right sprocket Approximately 13 RPM X1
STEER RIGHT RPM of left sprocket Approximately 13 RPM X2
STEER RIGHT RPM of right sprocket plus RPM of left sprocket.
RPM of right sprocket minus RPM of left sprocket. X1 + X2 = X3
X3 = 25.75 1.25 RPM
X1 - X2 = X4
X4 = 0.0 + 3.5 RPM X3
X4
STEER LEFT RPM of right sprocket Approximately 13 RPM Y1
STEER LEFT RPM of left sprocket Approximately 13 RPM Y2
STEER LEFT RPM of right sprocket plus RPM of left sprocket.
RPM of right sprocket minus RPM of left sprocket. Y1 + Y2 = Y3
Y3 = 25.75 1.25 RPM
Y1 - Y2 = Y4
Y4 = 0.0 + 3.5 RPM Y3
Y4
Add the combined totals of STEER RIGHT and STEER LEFT tests. X4 + Y4 = Z4
Z4 = 1.1 RPM Z4 Introduction
The Sprocket Speed Check indicates whether the operation of the steering circuit is normal.The check should be used primarily in a shop area after the machine has been repaired or after the machine has been rebuilt.Check Preparation
Move the machine to a smooth horizontal location.
Place the steering control lever in the NEUTRAL position.
Engage the parking brake.
Extend the counterweight approximately 30.5 cm (12 inch).
Stop the engine.
Turn the key to the ON position, but do not start the engine.
Verify that the implement lockout switch is in the UNLOCKED position.
Move the thumb rocker for the counterweight control to the extend position. The counterweight should move outward to the neutral position.
Move the control levers through the full range of travel several times. This procedure should relieve any pressure that may be present in the implement hydraulic system.
Make sure that the pressure in the entire hydraulic system has been released.
Separate the tracks. Remove the tracks from the sprockets on the final drives. Reference: Refer to Disassembly and Assembly, "Track - Separate" in the Service Manual for your machine.
Mark the sprockets of both final drives in order to count the revolutions during the checks. Check Procedure
Start the engine. Warm the hydraulic oil to a minimum temperature of 65 °C (150 °F).
Operate the engine at HIGH IDLE.
Move the transmission to NEUTRAL. Release the parking brake. Move the steering control lever to the end of the travel in the STEER RIGHT position.
Use a stopwatch to count the number of revolutions per minute of each sprocket. Add the rpm of the right sprocket to the rpm of the left sprocket. The sum of the rpm of the left sprocket and of the right sprocket should be 25.75 1.25 rpm.
Table 2
A Check of the Sprocket Speeds for Steering Oil Flow
Rpm of left sprocket 12.5 rpm
Add rpm of right sprocket. + 13.5 rpm
Sum of the rpm of the sprockets = 26.0