RETAINER 8E6949 - Caterpillar

Illustration 1 g03513140
Relief valve location (1) Boom cylinder line (rod end) (2) Bucket cylinder line (head end) (3) Stick cylinder line (head end) (4) Boom cylinder line (head end) (5) Bucket cylinder line (rod end) (6) Stick cylinder line (rod end) (7) Blade cylinder line (head end) (8) Swing (right) (9) Swing motor (10) Swing (left) (11) Main control valve
Table 1
Relief Valve    Specifications    Torque for Locknut    
(4) Boom cylinder line (head end)    
31000 kPa (4496 psi)    
29 2 N m (21 1 lb ft)    
(1) Boom cylinder line (rod end)    
(3) Stick cylinder line (head end)    
(6) Stick cylinder line (rod end)    
(2) Bucket cylinder line (head end)    
(5) Bucket cylinder line (rod end)    
(7) Blade cylinder line (head end)    
(8) Swing relief pressure (right)    
27000 1500 kPa (3916 218 psi)    
39 5 N m (29 4 lb ft)    
(10) Swing relief pressure (left)    
Pilot relief valve    
4100 kPa (595 psi)    
14 2 N m (10 1 lb ft)    
Specifications (Main Pump)        
Margin Pressure    
1200 100 kPa (174 15 psi)    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, "Main Hydraulic Pump Air - Purge".