SLEEVE 5B5252 - Caterpillar

Illustration 1 g03831399
Relief valve locations
(1) Margin relief valve
(2) Bucket cylinder rod end
(3) Stick cylinder head end
(4) Boom cylinder head end
(5) Boom cylinder rod end
(6) Bucket cylinder head end
(7) Stick cylinder rod end
(8) Swing left
(9) Swing right
(10) Pressure reducing valve
Table 1
Specifications (Relief Valves)
Relief Valve 305E2 CR 305.5E2 CR
Boom cylinder line (head end) 27500 500 kPa (3989 73 psi)
Boom cylinder line (rod end)
Stick cylinder line (head end)
Stick cylinder line (rod end)
Bucket cylinder line (head end)
Swing relief pressure (right) 21900 - 24900 kPa (3176 - 3611 psi) 21200 - 24200 kPa (3075 - 3510 psi)
Swing relief pressure (left)
Pilot relief valve 3500 200 kPa (508 29 psi)
Specifications (Main Pump) 305E2 CR 305.5E2 CR
Pump Cutoff Pressure 24800 350 kPa (3597 51 psi)
Margin Pressure 1700 100 kPa (247 15 psi)
Minimum Flow 20 3 L/min (5.3 0.8 US gpm) 31 3 L/min (8.2 0.8 US gpm)
Maximum Flow 119 3 L/min (31.4 0.8 US gpm) 130 3 L/min (34.3 0.8 US gpm) Note: Normal operations of the engine and pumps are necessary for the pressure adjustments. 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".