RIM GP-DEMOUNTABLE 2461579 - Caterpillar

Problem: Machine turns too fast to make small steering corrections when the machine moves at fast speeds.
PROBABLE CAUSE:1. Flow control valve adjustment is not correct. (See Steering Time Check in Testing and Adjusting).2. Main control spool does not move freely.3. Metering orifices on main control spool are filled with foreign material or were not drilled correctly.Steering Hydraulic System
When any test is made to the steering hydraulic system, the hydraulic oil must be at the normal temperature for operation. To increase the oil temperature, start the engine, lift the bucket or blade, and turn the machine in both directions.Pump Efficiency Check
For any pump test at a given rpm, the pump flow (gpm) at 100 psi (690 kPa) will be larger than the pump flow (gpm) at 1000 psi (6900 kPa).The difference between the pump flow of the two operating pressures is the flow loss.Method of finding flow loss ... Flow loss when given as a percent of pump flow is used as a measure of pump performance.Example of finding percent of flow loss ... If the percent of flow loss is more than 10%, pump performance is not good enough.*Numbers in examples are for illustration and are not values for any specific pump or pump condition. See SPECIFICATIONS for pump flow of a new pump at 100 and 1000 psi.Test On The Machine
Install a 5P3600 or 9S2000 Flow Meter. For Formula I, measure pump flow at 100 psi (690 kPa) and at 1000 psi (6900 kPa) with engine at high idle rpm. See Tee Test Tool Chart, Form No. REG00910.Formula I: Test On The Bench
If the test bench cannot be run at 1000 psi at a high rpm, use Formula II. Do the first part of the test at half speed rpm (See SPECIFICATIONS). Measure the pump flow at 100 psi (690 kPa) and 1000 psi (6900 kPa). Then for the last part of the test, measure the pump flow at 100 psi (690 kPa) while at full speed rpm (See SPECIFICATIONS).Formula II: Steering Force Check
Check the force needed to turn the steering wheel. The torque must be as follows:(a) To turn the steering wheel VERY SLOWLY when the engine is stopped ... 35 to 40 lb. in.(4.0 to 4.5 N m)(b) To turn the steering wheel VERY SLOWLY when the engine is at LOW IDLE ... 20 to 25 lb. in.(2.3 to 2.8 N m)Steering Time Check
To check the steering time, put the machine on a dry, hard surface. With the engine at high idle, the time for a full turn, from stop to stop, must not be more than 2.8 .2 second.The difference between the time for a right turn and the time for a left turn must not be more than .3 second. With the brakes activated, the time must not increase more than .2 second.If the difference between the times for a full right turn and a full left turn is more than .3 second:1. Remove the end cover from steering control