PLATE 0947392 - 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.
Personal injury can result from hydraulic oil pressure and hot oil.Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system.Make sure all of the work tools have been lowered to the ground, and the oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand.
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.
Note: Use the information in the reference to prepare the machine for this test.Reference: For the correct procedure to prepare the machine for this test, refer to Testing and Adjusting, "Machine Preparation for Troubleshooting" for the machine that is being serviced.
Table 1
Required Tools    
Part Number     Description     Qty    
8T-0861     Pressure Gauge (0 to 8700 psi)     1    
6V-3081     Hose Assembly     1    Pressure Taps
The following procedure will check the functions of the felling head.Use the pressure taps that are located in the front of the machine for checking the pressures for each function of the felling head. The pressure taps can assist in diagnosing problems with the felling head.
Illustration 1 g00788319
Front of the Machine (1) Saw motor. (2) Lateral tilt right. (3) Collector arms open. (4) Lateral tilt left. (5) Collector arms close. (6) Grapple arms open. (7) Grapple arms close.Place the machine on level ground.Attach the 6V-3081 Hose As and the 8T-0861 Pressure Gauge 0 to 60000 kPa (0 to 8700 psi) to the proper pressure tap for the function that is being operated.Operate each function of the felling head.
Grapple arms
Collector arms
Lateral tilt
Saw motorIf the cycle time of a function is slow, refer to the section in Testing and Adjusting for the function that needs to be serviced.