IDLER AS 3526075 - Caterpillar

Note: Use the information in the reference to prepare the machine for this test. Also, use the information in the reference to relieve any system pressure that may be present in the hydraulic system.ReferenceFor 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    
198-4240     Digital Pressure Indicator     1    
177-7861     Hose Assembly     1    
Place the machine on level ground.
Start the engine.
Run the engine at high idle.
Warm the hydraulic oil to normal operating temperature. Normal operating temperature is 40° C (104° F) to 60° C (140° F).
Illustration 1 g01217594
Initial IQAN display
Illustration 2 g01224823
Press function key (F3) in order to view the system pressures.
Illustration 3 g01162811
Hydraulic lockout control in the UNLOCKED position
Move the hydraulic lockout control to the UNLOCKED position.
Operate each of the following functions in the table below. The functions are equipped with pressure reducing valves. Monitor the pressure from the cab.
Table 2
Function     Pressure    
"Tilt Wrist"CW     289 3 Bar
28900 300 kPa (4190 50 psi)    
"Tilt Wrist"CCW    
Swing CW     303 3 Bar
30300 300 kPa (4395 50 psi)    
Swing CCW    
Grapple (Open)     249 3 Bar
24900 300 kPa (3610 50 psi)    
Grapple (Close)    
Accumulator (Open)     249 3 Bar
24900 300 kPa (3610 50 psi)    
Accumulator (Close)    
Left Level     246 3 Bar
24600 300 kPa (3570 50 psi)    
Right Level    
Forward Level     246 3 Bar
24600 300 kPa (3570 50 psi)    
Backward Level    
Record the readings on the display. If the readings are correct proceed to Step 13. If a function needs to be adjusted proceed to Step 9.
Illustration 4 g01162235
Location of the switch for the hood
Illustration 5 g01074453
Open the hood for the engine compartment.
Illustration 6 g01114880
(1) Pressure tap on the travel pump (2) Pressure tap on the implement pump
Attach the 198-4240 Digital Pressure Indicator to pressure tap (1) with the hose assembly.
Illustration 7 g01597434
Signal limiter valves on the implement control valve (3) Tilt control valve (4) Swing control valve (5) Grapple control valve (6) Accumulator control valve (A) Signal limiter valve CLOCKWISE (B) Signal limiter valve COUNTERCLOCKWISE (C) Signal limiter valve CLOCKWISE (D) Signal limiter valve COUNTERCLOCKWISE (E) Signal limiter valve OPEN (F) Signal limiter valve CLOSE (G) Signal limiter valve OPEN (H) Signal limiter valve CLOSE
Illustration 8 g01078995
Signal limiter valves on the travel control valve (7) Side leveling control valve (8) Forward leveling control valve (I) Signal limiter valve Left tilt (J) Signal limiter valve Right tilt (K) Signal limiter valve Forward (L) Signal limiter valve Backward
Adjust the function to the pressure in Table 2.
Remove the test equipment.
Move the engine speed dial to low idle. Shut off the engine.