PUMP GP-FUEL INJECTION 1086630 - Caterpillar

Hydraulic System
A good recommendation to follow is to install a new element in the oil filter housing before a hydraulic pressure test is to be made.There is no adjustment for either the ahead or astern clutch. If a clutch does not engage or keep engaged when the control is in either the AHEAD (forward) or ASTERN (reverse) position, the hydraulic pump is damaged or the clutch discs are badly worn.Operation Test
With the engine stopped, remove the plug from the tee in the control valve and install a 5M5317 Reducing Bushing in the tee. Install a 5S4648 Hose Assembly with an 8M2886 Pressure Gauge (0 - 600 psi) in the reducing bushing and tee.
OIL PRESSURE TESTStart the engine and run it long enough to get the temperature of the oil, in the marine transmission, to approximately 150° (65°C). The correct oil pressure is 50 to 60 psi (345 to 415 kPa) with the control valve lever in the NEUTRAL position. The correct oil pressure reading is 300 psi (2050 kPa). With the control valve lever in the AHEAD (forward) or ASTERN (reverse) position.If the pump is in good condition, and the pressure reading is too low, the pressure of the oil to engage a clutch can be increased.Remove the cover from the bottom of the control valve. Bypass valve (3) and springs (2) can fall when the cover is removed. Add spacers (1), in bypass valve (3) under springs (2) to increase the pressure of the oil to engage a clutch. Remove spacers (1) if the pressure reading on the gauge was too high.Put springs (2), bypass valve (3) with spacers (1) into the control valve and install the cover.
CROSS SECTION OF CONTROL VALVE
1. Spacers. 2. Springs. 3. Bypass valve.Test the oil pressure again. When the pressure reading is correct stop the engine and remove the hose assembly and reducing bushing. Install the plug in the tee on the control valve.Checking Pump Efficiency
It is best to make the efficiency tests of the pump on a test bench. The temperature of the oil in the test bench is 150°F (65°C).For any pump test, the pump flow, measured in gpm (litre/min) at 100 psi (690 kPa), will be larger than the pump flow at 1000 psi (6900 kPa) at the same rpm.The difference between the pump flow of two operating pressure 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 the Specifications for pump flow of a new pump at 100 psi and 1000 psi.Test On The Bench
Measure the pump flow at 100 psi (690 kPa) and at 1000 psi (6900 kPa). Use these values in Formula I. If the test bench can not be run at 1000 psi at full pump rpm, run the