COUPLING AS-PERMANENT 3236168 - Caterpillar

Testing and Adjusting the Vibratory Tachometer
Introduction
This test is designed to determine if the vibratory tachometer is calibrated correctly.
Sudden movement of the machine or release of oil under pressure can cause serious injury to persons on or near the machine.To prevent possible injury, perform the procedure that follows before testing and adjusting the hydraulic system.
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop Products Guide" for tools and supplies suitable to collect and contain fluids on Caterpillar products.Dispose of all fluids according to local regulations and mandates.
Required Tools
This test procedure may be performed with the following test equipment:
Standard toolingStandard Tooling
Illustration 1 g00928721
Illustration 2 g00929869
Use the tools in Table 1 to complete the following test procedure.
Table 1
Required Tools (Standard Tooling)    
Tool    Item    Part Number    Description    Qty    
A     -     133-0963     Vibratory Tachometer     1    
B     -     4C-6500     Digital Thermometer     1    
To avoid damage to the vibratory system during testing, always perform the testing with the vibratory drum on top of tires or on loose dirt. Tires will simulate a non-compacted soil condition.Never operate the vibratory system when the machine is on concrete.
If a testing time longer than three (3) minutes is required, rotate the drum periodically in order to lubricate the eccentric weight shaft bearings.
Testing Procedure
Illustration 3 g00928731
Control Console (1) Vibratory ON/OFF control (2) Vibratory amplitude control
Make sure that the parking brake is applied. Ensure that the propel control lever is in the STOP position.
Move the vibratory amplitude control (2) to the HIGH AMPLITUDE position.
Start the machine and run the engine at 2310 50 RPM. Check the hydraulic temperature with Tool (B) until the hydraulic oil temperature reaches 38°C (100°F).
Illustration 4 g00928738
Steering Console (3) Vibratory tachometer
Depress the vibratory ON/OFF control (1) on the propel lever to the ON position. Read the vibrations per minute (VPM) from optional VPM gauge (3).
Place Tool (A) on the drum. Read the VPM from Tool (A). Compare these values with the reading from the optional VPM gauge (3) .
VPM gauge (3) must be calibrated if the values are not equal.Adjusting Procedure
Illustration 5 g00928749
Vibratory Tachometer (5) Dial (6) Calibration screw (underneath cap)
Set large dial (5) on 8.
Use small calibration screw (6) in order to calibrate the gauge. Remove the cap and use a 2.0 mm (5/64 inch) allen wrench in order to adjust the small calibration screw.Note: If the reading from VPM gauge (3) is significantly different from the reading from Tool (A), the magnetic sensor output should be verified before tachometer (3) is calibrated.