PUMP GP-GEAR 2118745 - Caterpillar

Table 13
Technician's Check and Data Sheet     Machine Serial Number     ______________    
Record of Troubleshooting     Date     ______________    
Steering Hydraulic System     Service Meter Hours     ______________    
[_] Oil Levels            
[_] Turning Diameter     Left Turn     Right Turn        
__________ m (ft)     __________ m (ft)        
__________ m (ft)     __________ m (ft)     raised blade    
[_] Low Pressure Standby            
__________ kPa (psi)                
[_] Margin Pressure            
__________ kPa (psi)                
[_] Engine at High Idle RPM            
__________ rpm                
           
[_] Test for Steer Stall Condition     Left Turn     Right Turn    
Pump Discharge Pressure     = ____________ kPa (psi)     ____________ kPa (psi)    
RPM of Engine at High Idle     = ____________ rpm     ____________ rpm    
RPM at Steer Stall Condition     = ____________ rpm     ____________ rpm    
Difference between RPM at High Idle and RPM at Steer Stall Condition     = ____________ Δ rpm     ____________ Δ rpm    
Differential Pressure in Pump (Δ P) at Steer Stall Condition     = ____________ Δ kPa (psi)     ____________ Δ kPa (psi)    Steering System Troubleshooting
Problem Checklist
"The machine will not turn or the steering radius is very large."
"The turning radius is too large in both directions only when the implement controls are in the HOLD position."
"The turning radius is too large in both directions."
"The turning radius is too large in one direction."Probable Causes for Problems in the Hydraulic Steering Pump and System
The machine will not turn or the steering radius is very large.
The steering tiller is disconnected or broken.
The steering pump is not connected to the pump drive or the pump drive shaft is broken.
The oil level in the hydraulic tank is low.
The steering pump or the steering motor has failed.
The system pressure or the pilot pressure is low.
The parking brake is ON. Check the following causes:
The oil pressure in the power train is low.
The brake valve has excessive internal leakage.
A mechanical problem in the drive train is interfering with the steering.The turning radius is too large in both directions only when the implement controls are in the HOLD position.
The implement pressure reducing valve is not shifting at the correct pressure.
The implement pump standby pressure is too low.The turning radius is too large in both directions.
The system pressure in the steering circuit is low. Check the following causes:
The steering pump is faulty or worn. See Step 3.
The bypass valve is suspect.
The pressure control valve is set too low.
The pressure control valve has excessive leakage.
The steering motor is failing. See Step 4.
The pilot pressure is low. Check the following causes:
The steering tiller is improperly adjusted.
The steering pilot valve needs adjustment.
The pilot valve has excessive leakage.
A supply line to the pilot valve