568 Forest Machine Hydraulic System Specifications Caterpillar


Specifications
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Illustration 1g02418941
Relief valve locations
(1) Main relief valve
(2) Boom cylinder line (head end)
(3) Boom cylinder line (rod end)
(4) Stick cylinder line (rod end)
(5) Stick cylinder line (head end)
(6) Bucket cylinder line (head end)
(7) Bucket cylinder line (rod end)
(8) Grapple cylinder line (head end)
(9) Grapple cylinder line (rod end)
(10) Left travel crossover relief valve for forward travel (upper valve)
(11) Left travel crossover relief valve for reverse travel (lower valve)
(12) Right travel crossover relief valve for forward travel (upper valve)
(13) Right travel crossover relief valve for reverse travel (lower valve)
(14) Pilot relief valve
(15) Swing (left)
(16) Swing (right)
(17) Grapple rotate adjustment
(18) Main control valve
(19) Pilot filter
(20) Travel motor (right)
(21) Travel motor (left)
(22) Right swing motor
(23) Left swing motor
(24) Grapple rotate control valve

Table 1
Relief Valve  Specifications  Torque for Locknut  
Main relief valve  35000 ± 500 kPa (5076 ± 73 psi)  50 ± 10 N·m (37 ± 7 lb ft) 
38000 ± 500 kPa (5512 ± 73 psi)
(Heavy Lift)
69 ± 10 N·m (51 ± 7 lb ft) 
Boom cylinder line (head end)  40000 + 2000 - 500 kPa (5802 + 290 - 73 psi)  20 ± 2 N·m (14 ± 1 lb ft) 
Boom cylinder line (rod end)  37000 + 2000 - 500 kPa (5366 + 290 - 73 psi) 
Stick cylinder line (head end)  40000 + 2000 - 500 kPa (5802 + 290 - 73 psi) 
Stick cylinder line (rod end)  37000 + 2000 - 500 kPa (5366 + 290 - 73 psi) 
Bucket / Heel / Tilt cylinder line (head end)  37000 + 2000 - 500 kPa (5360 + 290 - 73 psi) 
Bucket / Heel / Tilt cylinder line (rod end) 
Thumb cylinder line (head end)  36990 ± 1000 kPa (5365 ± 145 psi) 
Thumb cylinder line (rod end) 
Grapple cylinder line (head end)  27550 ± 650 kPa (3996 ± 94 psi) 
Grapple cylinder line (rod end) 
Grapple Rotate (clockwise)  10335 ± 345 kPa (1500 ± 50 psi)   
Grapple Rotate (counterclockwise) 
Swing relief pressure (right)  31400 ± 1000 kPa (4554 ± 145 psi)  117 ± 10 N·m (85 ± 7 lb ft) 
Swing relief pressure (left) 
Left travel crossover relief valve (forward)  37500 ± 1500 kPa (5439 ± 218 psi)  92 ± 8 N·m (68 ± 6 lb ft) 
Left travel crossover relief valve (reverse) 
Right travel crossover relief valve (forward) 
Right travel crossover relief valve (reverse) 
Pilot relief valve  4100 ± 200 kPa (595 ± 29 psi)  49 ± 5 N·m (36 ± 4 lb ft) 

Table 2
Relief Valves  Pressure change With One Turn Of Adjustment Screw 
Main valves  14400 kPa (2100 psi) 
Line relief valve  11000 kPa (1600 psi) 
Swing relief valve  6800 kPa (985 psi) 
Pilot relief valve  620 kPa (90 psi) 

Note: Pressure values in Table 2 are approximate values. Use a pressure gauge for adjustment.

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 check the engine and the pump characteristic curve. 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, "Main Hydraulic Pump Air - Purge".

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