ROD 6E3840 - Caterpillar

Table 1
Problem     Probable Cause     Possible Solution    
The pump does not deliver fluid.     Hydraulic line ruptured.     Inspect the hydraulic lines for ruptures. Replace the lines, as needed.    
Air is leaking at the inlet. Inspect all inlet connections for air leakage. Tighten any loose connections.    
Leaking seals or missing seals. Replace the seals.    
The inlet pipe in the reservoir is restricted. Inspect filters and strainers for dirt or sludge. Clean the filters or replace the filters, as needed.    
The pump will not prime. The oil is the wrong viscosity. Drain fluid from the system. Refill with new, filtered fluid of the proper viscosity.    
The pump is not pumping. Check fluid level in the reservoir. Ensure that the inlet opening is covered. Add new filtered fluid, as needed. Ensure that the pump is operating above the required minimum drive speed.    
The shaft is disengaged or the shaft is shared. The coupling is disengaged or the coupling is shared. Inspect couplings for damage. Replace couplings, as needed. Disassemble the pump and inspect the shaft and the cartridge for damage.    
The pump is driven in the wrong direction of rotation. In order to change the rotation of the pump, the pump must be shut down.    
Vanes stuck in the rotor slots. Disassemble the pump and the cartridge. Inspect all parts for metal chips or dirt. Ensure that the vanes move freely within the slots in the rotor. Clean all parts and replace damaged parts.    
The system has insufficient pressure.     The system relief valve is set too low.     Use a pressure gauge to adjust the relief valve setting.    
Internal fluid loss Inspect the system for possible fluid leakage. Replace any damaged parts.    
The cartridge assembled for wrong rotation. Disassemble the pump and the cartridge. Reassemble the cartridge for the proper direction of rotation.    
The inlet lines are damaged or the inlet lines are reversed. The outlet lines are damaged or the outlet lines are reversed. Inspect the inlet lines for damage. Inspect the inlet lines for improper connections. Inspect the outlet lines for damage. Inspect the outlet lines for improper connections. Reconnect the lines to proper ports. Replace the lines, as needed.    
Inspect the drive mechanism for damage. Ensure that the drive is properly connected to the pump shaft. Replace the damaged parts, as needed.
Excessively noisy pump operation     The fluid level is too low in the reservoir.     Refill the reservoir to the proper level with new, filtered fluid.    
Fluid in the system is too thick. Drain fluid from the system. Refill with new, filtered fluid of the proper viscosity.    
The inlet pipe is restricted in the reservoir. Inspect filters and strainers for dirt or sludge. Clean the filters or replace the filters, as needed.    
Air is present in the system. Inspect inlet connections for air leakage. Tighten any loose connections.    
Inspect seals for damage. Replace the