VALVE GP-SELECTOR & PRESS CONT 8E7580 - Caterpillar

3. Put the transmission control lever in FOURTH SPEED FORWARD. Push the accelerator pedal down completely. Allow the engine rpm to stabilize and take a reading from the tachometer.4. The correct stall speed is 2090 65 rpm.Stall speeds that are low are an indication that engine performance is not correct. If the test is to be repeated, allow at least two minutes between tests with the transmission in NEUTRAL.Electrical Tests
Transmission Electrical Schematic
(1) Connector at rear of transmission.(2) Ten pin connector.(3) Eight pin connector.For a complete electrical schematic of the 928F, see SENR5969, 928F Wheel Loader Electrical System Schematic.If the wire harness connections are not made properly, they can cause either continuous or intermittent problems. Make sure all connectors in a problem circuit are fastened correctly before tests are performed.Input Voltage To Shift Control
Repair wiring after probing. Seal the punctures with 8T0065 Adhesive. Cover the adhesive with two layers of 1P0810 Tape.DO NOT DISCONNECT ANY HARNESS CONNECTORS AT THIS TIME.Turn the key switch to the ON position. DO NOT START THE ENGINE.To test for voltage, use sharp meter test leads, puncture the wire insulation and measure the voltage between contacts.Input voltage to the shift control can be checked between contacts 1 and 9. The voltage measured should be equal to the machine system voltage. If no voltage is measured, check all harness connectors and the supply fuse.Shift Control Solenoid Circuit Tests
The chart gives the contact numbers across which a voltage measurement should be taken when the gear selector is in the gear shown. Repair wiring after probing. Seal the punctures with 8T0065 Adhesive. Cover the adhesive with two layers of 1P0810 Tape.DO NOT DISCONNECT ANY HARNESS CONNECTORS AT THIS TIME. Turn the key switch to the ON position. DO NOT START THE ENGINE.To test for voltage, use sharp meter test leads, puncture the wire insulation and measure the voltage between contacts.Additional Checks
These checks are to be performed at the eight pin connector coming from the shift control.Neutral Start
Perform this test with the engine stopped and the key switch in the OFF position.With the shift control lever in NEUTRAL, there must be continuity between contacts 3 and 4. This indicates the ability to start the machine. If there is no continuity, the machine will not start and the shift control must be replaced.Back-Up Alarm
Perform this test with the engine stopped and the key switch in the OFF position.With the shift control lever in REVERSE, there must be continuity between contacts 2 and 5. This activates the back-up alarm. If there is no continuity, the back-up alarm will not work and the shift control must be replaced.Transmission Neutralizer
Perform this test with the engine stopped and the key switch in the ON position.Put the transmission neutralizer lock out switch in the OFF position (bottom of switch depressed, lamp off). With the service brake NOT applied, there must be voltage measured between contacts 1 and 2. If there is no voltage, check all harness connectors and the transmission neutralizer switch at the