BRACKET 1756789 - Caterpillar

Table 1
REQUIRED TOOLS    
Part Number     Description     Qty    
6V-4143     Coupler As     2    
177-7861     Hose As     1    
6V-3989     Fitting     1    
8T-0855     Pressure Gauge (
4000 kPa (580 psi))     1    
Personal injury or death can result from escaping fluid under pressure.Escaping fluid under pressure, even a very small pin-hole size leak, can penetrate body tissue and cause serious injury and possible death. If fluid is injected into your skin, it must be treated immediately by a doctor familiar with this type of injury.Always use a board or cardboard when checking for a leak.
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 Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Caterpillar products.Dispose of all fluids according to local regulations and mandates.
Do not adjust the main relief valve above the specified pressure. Adjustment of the main relief valve above the specified pressure may cause damage to the gear pump.
Perform the main relief valve test in order to determine if the main relief valve for the work tool is damaged or improperly set.
Engage the parking brake. Stop the engine.
Raise the cab. Refer to Operation and Maintenance Manual, "Cab Support Operation" for the proper procedure.
Illustration 1 g01055240
(1) Test port
Connect one end of the 177-7861 Hose to the test port (1) for the work tool. Connect the 8T-0860 Gauge to the other end of the 177-7861 Hose .
Route the test hose so that the cab will not rest on the hose. Securely bolt the cab to the frame.
Sit in the operator's seat. Fasten the seat belt. Lower the armrest. Start the engine. Disengage the parking brake.
Set the engine to HIGH IDLE.
Illustration 2 g00788651
Pilot operated hydraulic control ( work tool)
Move the pilot operated control lever for the work tool to the full LOWER position. Hold the control lever until the lift arms are fully lowered and a stall condition exists. Note: Do not stall the hydraulic system for more than 10 seconds. If necessary, release the work tool from the stall condition. Release the work tool for 30 seconds and repeat the following step.
Record the system pressure for the work tool during the stall condition. Move the control lever for the work tool to the NEUTRAL position.
Table 2
MAIN RELIEF PRESSURE    
Machine     Main Relief Pressure    
248B/ 268B (1)    
23000 1000 kPa (3336 145 psi)    
( 1 ) HF XPS
Release the hydraulic control from the stall condition. Tilt the work tool until the work tool is parallel with the ground. Stop the engine.
If the pressure is not within specifications, proceed to Testing and Adjusting, "High Flow Hydraulic System - Test and Adjust".