LINES GP-PILOT 0875077 - Caterpillar

Troubleshooting for the Signal Resolver Network
Personal injury or death can result from improperly checking for a leak.Always use a board or cardboard when checking for a leak. Escaping air or fluid under pressure, even a pin-hole size leak, can penetrate body tissue causing 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.
Sudden movement of the machine or release of oil under pressure can cause injury to persons on or near the machine.To prevent possible injury, perform the procedure that follows before testing and adjusting the hydraulic system.
Table 1
REQUIRED TOOLS    
Part Number     Description     Quantity    
8T-0860     Gauge     1    
177-7860     Hose Assembly     1    
6V-4143     Coupler     2    
Illustration 1 g01274126
(5) Tap for system pressureThe signal network can be easily checked. Install one 6V-4143 Coupler Assembly to each end of the 177-7860 Hose Assembly . Install the 8T-0860 Gauge with a range of 0 to 40000 kPa (0 to 5800 psi) to the coupler assembly. Install 177-7860 Hose Assembly to system pressure tap (5) .Start the engine and warm up the hydraulic oil to the operating temperature. Run the engine at 1200 RPM. Operate each hydraulic control in the following order.
Auxiliary for the loader (if equipped)
Loader bucket tilt
Lift control for the loader
Steering
Right side stabilizer
Left side stabilizer
Auxiliary for the backhoe (if equipped)
Boom
Swing
Backhoe bucket
Stick
Extendable stick (if equipped)Stall each circuit. The following tables contain the signal pressures for the hydraulic circuits.
Table 2
Signal Pressures for 416E, 422E, and 428E    
Cylinder     Circuit     Pressure     Actual    
Loader Tilt Circuit for the Parallel Lift
428E     Rod End for the Tilt Back Operation     428E
19700 kPa to 21700 kPa (2858 psi to 3147 psi)        
Head End for the Dump Operation 428E
17000 kPa to 19000 kPa (2466 psi to 2756 psi)        
Loader Tilt Circuit for the Single Tilt Machine
416E and 422E     Rod End for the Dump Operation     416E and 422E
19700 kPa to 21700 kPa (2858 psi to 3147 psi)        
Head End for the Tilt Back Operation
Steering     Steering Cylinder    
16800 kPa to 19700 kPa (2437 psi to 2858 psi)        
Right Side Stabilizer     Rod End    
21800 kPa to 23800 kPa (3160 psi to 3450 psi)        
Left Side Stabilizer     Rod End    
Extendable Stick (if equipped)     Rod End    
Stick     Rod End and Head End    
Backhoe Bucket     Rod End and Head End    
Swing     Port A and Port B    
Boom     Rod End    
Boom     Head End    
19000 kPa to 21000 kPa (2755 psi to 3045 psi)        BOOM LOWER Test
Engage the boom lock.
Run the engine at LOW idle.
Push the boom control lever fully forward in order to activate the BOOM LOWER circuit.
Note the pressure reading at pressure tap (5) .
See Table 3