HOUSING A 8N8303 - Caterpillar

Checking Pump Efficiency
For any pump test, the pump flow, measured in gpm (lit/min) at 100 psi (7,0 kg/cm2) will be larger than the pump flow at 1000 psi (70,3 kg/cm2) at the same rpm.The difference between the pump flow of two operating pressures is the flow loss. Flow loss when expressed as a percent of flow loss is used as a measure of pump performance. 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 psi and 1000 psi. Test On The MachineInstall a 9S2000 Flow Meter. [See subject, PUMP TESTS (CHART B) in FLOW METER TEE TEST PROCEDURE VI, FORM NO. REG01140]. Measure pump flow at 100 psi (7,0 kg/cm2) and at 1000 psi (70,3 kg/cm2) with engine at 2000 rpm. Test On The BenchIf the test bench can not be run at 1000 psi at a high rpm, do the first part of the test with the pump shaft rotation at 890 rpm. Measure pump flow at 100 psi (7,0 kg/cm2) and at 1000 psi (70,3 kg/cm2). Then in order to measure the pump flow for the last part of the test, see SPECIFICATIONS for: Pump rpm at 100 psi with the engine at 2000 rpm. Testing Pressure Relief Valve
1. Remove the floor plate directly in front of the operator's seat.2. Remove the test plug (4) and install necessary fittings, hose and a 7S8714 Gauge (0 to 4000 psi).
STEERING CONTROL VALVE3. Install a FT508 Stop Block on a frame stop.4. With engine at high idle speed, turn the machine against the stop block and hold the steering wheel turned. The pressure relief valve setting should be in the range of 2500 50 psi (175,8 3,5 kg/cm2).5. Add or remove shims (2) to adjust the relief valve setting. Adding shims increases the pressure setting.
CROSS SECTION OF STEERING CONTROL VALVE
1. Plug. 2. Shims (main relief valve). 3. Shims (balance cylinder pressure). 4. Plug (main relief pressure tap location). Tighten plug (1) to 36 4 lb. ft. (5,0 0,6 mkg). Tighten plug (4) to 24 2 lb. ft. (3,3 0,3 mkg) (7J966 control valve). Testing Cylinder Pressure Balance6. Install the appropriate plate assemblies between lines (12 and 13) and steering control valve. Install a hose assembly and a 8M2885 Gauge (0 to 200 psi) in each plate assembly.
STEERING CONTROL VALVE AND RELATED LINKAGE
5. Nut and lock. 6. Eyebolt assembly. 7. Locknut. 8. Housing assembly. 9. Setscrew. 10. Setscrew locknut. 11. Lever. 12. Oil line to steering cylinders. 13. Oil line to steering cylinders. 14. Linkage rod end. 15. Rod end locknut. B. Total linear movement when steering wheel is rotated from lock to lock. Approximately 1.12 in. (28,4 mm).
Connect the steering safety link.
7. Disconnect end (14) from valve spool. Disconnect eyebolt assembly (6) from follow-up mechanism.8. The steering valve spool