305 CR Mini Hydraulic Excavator Hydraulic System Specifications Caterpillar


Specifications
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Note: A New specification is the performance that can be expected for a new machine. A Rebuild specification is the performance that can be expected after rebuilding the components of a system. Performance beyond Service Limit specifications is an indication of these problems: improper adjustment, wear, damage of relief valves and damage of pumps.

Table 1
Relief Valve     Specifications    
New Rebuild     Service Limit    
Main relief valve    
24500 +1500/(- 0) kPa (3553 +218/(- 0) psi)    

24500 +1500/(- 0) kPa (3553 +218/(- 0) psi)    
Boom cylinder line (head end)    
27900 ± 1500 kPa (4050 ± 220 psi)    

27900 ± 1500 kPa (4050 ± 220 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)    
20000 ± 1000 kPa (2900 ± 145 psi)    

20000 ± 1000 kPa (2900 ± 145 psi)    
Swing relief pressure (left)    
Pilot relief valve    
3400 ± 200 kPa (495 ± 30 psi)    

3400 ± 200 kPa (495 ± 30 psi)    

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".

Information System:

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