PLATE 0947394 - Caterpillar

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. Also, use the information in the reference to relieve any hydraulic pressure that may be in the hydraulic system.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.Reference: For the correct procedure to relieve any hydraulic oil pressure that may be in the hydraulic system, refer to Testing and Adjusting, "Hydraulic System Pressure - Release" 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    
Place the machine on level ground.
Lower the felling head to the ground.
Stop the engine.
Illustration 1 g00785429
Right Side of the Machine
Open the cover for the engine compartment.
Release all hydraulic system pressure. See the reference at the start of this procedure for the correct method.
Illustration 2 g00787334
(1) Pressure tap for the upper pump.
Attach a 6V-3081 Hose As to pressure tap (1) .
Attach the unconnected end of the hose assembly to the 8T-0861 Pressure Gauge (0 to 60000 kPa (0 to 8700 psi)).
Start the engine.
Warm the hydraulic oil to normal operating temperature. Normal operating temperature is 55 5°C (130 10°F).
Move the engine speed dial to position "10". This is the high idle engine speed for the machine (2200 80 RPM).
Move the hydraulic activation control lever to the UNLOCKED position. When the hydraulic activation control lever is in the UNLOCKED position all the implements will function.
Stall any of the following functions:
Open grapple arms or close grapple arms
Open collector arms or close collector armsRecord the pressure while you are stalling the function.Note: The pressure will be identical for all the functions. It is not necessary to stall more than one function.
The pressure should be 24000 kPa (3500 psi).
If the pressure is correct proceed to step 16. If the pressure is incorrect proceed to step