ALTERNATOR GP-CHARGING 3844447 - Caterpillar

Table 2
Required Tools    
Part Number     Description     Qty    
4C-6500     Digital Thermometer     1    
JERD2129     Data Subscription for Electronic Technician (Version 2.4 or a newer version)     1    
139-4166     Data Communication Line for Electronic Technician     1    
7X-1701     Communications Adapter for Electronic Technician     1    
7X-1425     Cable for 7X-1701 to PC Communications Port     1    
9U-7400     Multitach Tool Group     1    
1U-5796     Pressure Differential Gauge Group     1    Note: Use Electronic Technician ( ET) or a Multitach in order to monitor engine speed.
Table 3
Relief Valves    Pressure change With One Turn Of Adjustment Screw    
Signal relief valves     Low Pressure    
10600 kPa (1525 psi)    
High Pressure
7050 kPa (1025 psi)    
Line relief valve    
6850 kPa (1000 psi)    
Swing relief valve    
10000 kPa (1450 psi)    
Travel crossover relief valve    
10000 kPa (1450 psi)    
Pilot relief valve    
690 kPa (100 psi)    Note: Pressure values in Table 3 are approximate values. Use a pressure gauge for adjustment.Preparation For Relief Valve Adjustment
Position the machine on level ground.
Stop the engine.
Release the pressure in the hydraulic system. Refer to Testing And Adjusting, "Hydraulic System Pressure - Release".
Illustration 2 g00597516
Pump compartment (1) Pressure tap (front pump delivery pressure) (2) Pressure tap (rear pump delivery pressure)
Connect a 60000 kPa (8700 psi) pressure gauge to pressure tap (1). Connect a 60000 kPa (8700 psi) pressure gauge to pressure tap (2) .
Illustration 3 g00952987
Pump compartment (3) Pressure tap (power shift pressure)
Connect a 4000 kPa (580 psi) pressure gauge to pressure tap (3) .
Illustration 4 g00556726
Connect the data communication line for the Electronic Technician to service connector (48) .
Start the engine.
Illustration 5 g00726210
(C) Display for Digging Mode (D) Key for Digging Mode
Place the machine controls at the following settings: Engine speed dial "10", AEC switch OFF, Digging Mode and Gain/Response (normal). Refer to Testing and Adjusting, "Engine Performance - Test" for engine rpm settings.
Place the hydraulic activation control lever in the UNLOCKED position.
Increase the hydraulic oil temperature to 55° 5°C (131° 9°F).Note: Normal operations of the engine and pumps are necessary for the pressure adjustments. If the results of the pressure adjustment are not correct, then the engine and the pump characteristic curve needs to be checked. Slow output flow from the pump is an indication of air in the hydraulic system. Make sure that no air is present in the hydraulic system. Refer to Testing And Adjusting, "Hydraulic System Pressure - Release".