SUPPORT 9L6035 - Caterpillar

Illustration 2 g02440016
Location of Pressure Taps and Pressure Reducing Valves (20) Main valve right side (21) Main valve left side (22) Upper knives (UK) pressure reducing valve (23) Feed roller arms (WA) pressure reducing valve (24) Tilt section (CF) pressure reducing valve (25) Lower knives (LK) pressure reducing valve (26) High pressure reducing valve (HPR) (27) Main relief valve (HP) (28) Saw bar feed cylinder pressure reducing valve (SPR) (A) Pressure tap for upper knives (M8) (B) Pressure tap for high pressure reducing valve (M4) (C) Pressure tap for feed roller arms (M7) (D) Pressure tap for tilt section (M6) (E) Pressure tap for lower knives section (M5) (F) Pressure tap for pump pressure (M1) (G) Pressure tap for saw bar feed cylinder (M9)Operational Pressures
Table 1
Functions and Pressure Settings for the Main Control Valve    
Function    Setting    
Stand by pump pressure (1)    
2500 kPa (360 psi)
25 bar    
High pump pressure (1)    
25000 kPa (3625 psi)
250 bar    
Working Pressure    
25000 kPa (3625 psi)
250 bar    
Saw bar feed cylinder (SPR) (2)    
5500 to 6500 kPa (800 to 940 psi)
55 to 65 bar    
Feed roller arms (WA) (3)    
8500 kPa (1235 psi)
85 bar    
Lower knives (LK) (3)    
3500 kPa (510 psi)
35 bar    
Tilt (CF) (3) (4)    
9000 to 12000 kPa (1300 to 1740 psi)
90 to 120 bar    
Upper knives (UK) (3) (5)    
3500 kPa (510 psi)
35 bar    
High pressure reducing valve (HPR) (6)    
13500 kPa (1960 psi)
135 bar    
Rotator (Optional function) (7)    
21000 kPa (3045psi)
210 bar    
Main relief valve    
30000 kPa (4350 psi)
300 bar    
( 1 ) Check the carrier pressure
( 2 ) Depends on the tree type
( 3 ) Pressure with the wire harness disconnected from the solenoid valve.
( 4 ) May need to adjust so head does not bang the frame when tilted up
( 5 ) Pressure may need to be adjusted lower according to the application
( 6 ) Maximum pressure for all of the hydraulic cylinders except the saw.
( 7 ) The setting is nonadjustableProportional Pressures
Table 2
Upper Knives     Minimum
3500 kPa (510 psi)
35 bar    
Maximum
13500 kPa (1960 psi)
135 bar
Lower Knives     Minimum
3500 kPa (510 psi)
35 bar    
Maximum
13500 kPa (1960 psi)
135 bar
Feed Roller Arms     Minimum
8500 kPa (1235psi)
85 bar    
Maximum
13500 kPa (1960 psi)
135 bar Feed Roller Motors
Use the table below for troubleshooting the feed roller motors.
Table 3
Troubles     Causes     Remedies    
Noisy Motor     Without Load     Regular rumbling     Worn bearing support     Replace the bear support    
Vibrations Mounting and/or hydraulic piping becoming loose Tighten to torque    
Under load Clattering     Boost pressure too low     Check the setting and counter pressure valve    
Cavitation Excessive internal leaks     Replace the cylinders block and distribution valve assembly    
Motor Does Not Revolve     No supply to the motor     Check pump drive and pump inlet    
The circuit does not reach working pressure Check condition of safety