GEAR 1960398 - Caterpillar

Image1.24.1
25. Use a 7/16" wrench to hold the Body of the fitting from turning. Use a 1/2" wrench to tighten the Nut until the orientation line on the Nut rotates 3/4 of a turn. Do not over-tighten the Nut more than 3/4 of a turn or the excessive crimp can damage the RTD Probe.
26. Gently tug on the RTD Probe (not the wires) to insure it is fixed in place with adequate crimp. If inspection of the crimp is necessary, perform the following steps.
a. Mark a line on the Body of the fitting aligned with the orientation line on the Nut after the Nut was tightened 3/4 of a turn.
b. Loosen the Nut and remove the sensor to inspect - a sample crimp is shown below.
c. Re-tighten the Nut so that both marks align. Tighten the Nut a little more so that the marks are no longer aligned. The fitting should now be tight again.
Image1.26.1
27. Fasten the conduit brackets and clips back onto the endbells using the same hardware that was removed earlier.
28. Feed the wires of new Harness As. PN 437-2742 into the Auxiliary Box. Fasten the Receptacle As. to the front of the Auxiliary Box using the same hardware that was removed earlier. The orientation of the Receptacle As. is shown below - note the location of the notches that are circled.
Image1.28.1
29. The lead-wires in the Harness As. are bundled for each RTD and labeled with "B1", "B2", "R1", and "R2". Connect the Harness As. lead-wire ring-terminals (3 per RTD) to the following terminal strip labelled locations:
"B1" ? "BTD1" or top 3 poles on the 6-pole terminal-strip
"B2" ? "BTD2" or bottom 3 poles on the 6-pole terminal-strip
"R1" ? "RTD1" or top 3 poles on the 18-pole terminal-strip
"R2" ? "RTD2" or next 3 poles on the 18-pole terminal-strip
If the old Harness As. was connected to other winding RTDs due to failure of R1 or R2, connect the new Harness As. to the same locations on the terminal-strip. The red lead-wire ring-terminal for each RTD must connect to the location labelled "R". The two white leads connect to either of the locations labelled "W". Tighten all terminal block screws to a torque of 1.1 - 1.4 Nm (10 - 12 lb in).
Image1.29.1
Electrical Checkout of RTDs and Connections
A 12-Pin Breakout Harness (DT Cable As. PN 326-4907) or similar will facilitate the following electrical checkout. The appropriate Deutsch DT socket with lead wire can also be used.
30. Check the resistance or continuity of the harness and connections, from the RTD connection at the terminal-strip to the Receptacle As. pin. This process will also ensure that the terminals are connected at the correct locations:
a. Connect a Multimeter probe to Pin #1 in the Receptacle As. Place the other probe onto the BTD1 RTD red lead screw on the terminal-strip ? the resistance should be close to 0 Ohms (continuity check).
b. Move the Multimeter probe to Pin #2 in the Receptacle As. Place the other probe onto either the BTD1 RTD 1st