SOLENOID 2667599 - Caterpillar

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 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 Tooling 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 start steering wheel rotation with engine at low idle ... 18 to 22 lb.in.(2.1 to 2.5 N m)(b) To keep steering wheel moving slowly with engine at low idle ... 18 to 20 lb. in.(2.1 to 2.3 N m)Steering Time
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:814 ... 3.6 seconds950 ... 2.7 seconds966C ... 3.0 seconds980B ... 3.1 secondsThe difference between the time for a right turn and the time for a left turn must not be more than .2 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 .2 second:1. Remove the end cover from steering control valve (1).2. Add flow balance shims (2) to decrease the right turn time (steer faster) and increase the left turn time (steer slower). If the flow balance shims are removed, the result is opposite.3. Shims (2) are available in two thicknesses. 5J4776 Shims are .005 in. (0.13 mm) thick. 4J8224 Shims are .010 in. (0.25 mm) thick. Two 4J8224 Shims will change the steering time at high idle by approximately .1 second.EXAMPLE: A check of the steering times shows that the right turn time is .4 second more than the left turn time. Shims (2) must be added to decrease the difference between the times. The addition of four 4J8224 Shims will decrease the right turn time by approximately .2 second and increase the left turn time approximately .2 second. This will make the right and left turn times approximately the same.4. Replace the end cover on the control valve.
STEERING