CLIP 1788214 - Caterpillar

On/Off Time Delay (Relay)
ON/OFF TIME DELAY (RELAY) Performance Check (either TD1 or TD2 relays can be checked with methods that follow)A. Items Required For Check: 1. Battery or any D.C. source of 8 to 40 volts.2. Voltmeter (6V7070 Multimeter or one of same accuracy).3. Stop watch.B. Bench Or Installed TestConnect or verify source voltage to relay terminals 3 (-) and 4 (+) [if bench testing, also connect positive (+) voltage to relay terminal 6]. All connections must be maintained until tests are complete. There will be voltage when the relay is closed. When relay is open, there will be no voltage [voltage may be positive (+) or negative (-) when relay is tested on engine; when bench testing, voltage will always be positive (+)].1. Use the voltmeter to verify chart that follows: 2. (a) Apply positive (+) source voltage to terminal 1 (either relay) and immediately verify the chart that follows (do not leave voltage on terminal 1 for more than 60 seconds): (b) Remove positive (+) source voltage from terminal 1. Use a stop watch and check the time from the moment of removal to verify chart that follows: 3. (a) Apply positive (+) source voltage to terminal 2. If bench testing, Step 3 can be used with either relay. When installed on engine, Step 3 can only be checked with TD2. Do not apply positive (+) voltage to terminal 2 of TD1, or a direct short will result.Check the time from the moment voltage is applied to verify chart that follows (do not leave voltage on terminal 2 for more than 60 seconds): (b) Remove positive (+) source voltage from terminal 2. Check the time from the moment of removal to verify chart that follows: 4. Remove wire from terminal 4 and verify chart that follows: