24-11-01
ALL ú ú 01 Page 410 ú Jan 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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MAINTENANCE MANUAL
(d)
Install the pressure fill elbow coupling (13) with the O-ring and the drilled jamnut (12). Turn the assembly as a unit until the O-ring is seated against the pressure fill boss. Tighten the drilled jamnut (12) to 110-150 pound-inches (12.43-16.95 Newton-meters).
(e)
Lock the drilled jamnut (12) with wire.
(f)
Get a new or shop-tested overflow drain coupling (15).
(g)
Lubricate a new O-ring (9) with engine-oil and install the O-ring on the overflow drain coupling (15).
(h)
Install the overflow drain coupling (15). Tighten the coupling to 110-150 pound-inches (12.43-16.95 Newton-meters).
S 434-020
(5) Install the thermal relief drain line as follows:
(a)
Remove the plug from the thermal relief valve port.
(b)
Install the screw and the nut which attach the thermal relief line to the bracket near the bottom of the IDG.
(c)
AIRPLANES WITH RB211 ENGINES; Lubricate and install two O-rings (11) on the thermal relief line.
(d)
AIRPLANES WITH RB211 ENGINES; Install the thermal relief line and tighten the bolt to 230 pound-inches (25.99 Newton-meters).
S 434-021
(6) Install the electrical connectors as follows:
(a)
Remove the caps from the two IDG electrical connectors.
(b)
Connect the wiring harness to the two IDG electrical
connectors.
S 434-022
(7) Install the phase leads on the IDG as follows:
(a)
Remove the screws (1) and washers (2) that attach the terminal block cover (3) to the IDG.
(b)
Remove the spiralock nuts (4), the self-locking nuts, or the terminal nuts and washers which are installed on the terminal studs.
(c)
Visually inspect the power terminal studs for any damage.
(d)
Make sure the square washers are under the through leads.
(e)
If the phase color sleeves on the power feeder cables are damaged or missing, replace the sleeves (SWPM 20-10-14).
(f)
If the fanning strip is damaged or loose, replace the fanning strip.
CAUTION: MAKE SURE THAT YOU CONNECT THE PHASE LEADS TO THE CORRECT
_______ TERMINAL STUDS ON THE IDG. AN INCORRECT INSTALLATION CAN CAUSE CIRCUIT MALFUNCTION.
(g) Attach the four phase leads to IDG power terminal studs.
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24-11-01
ALL ú ú 03 Page 411 ú Jan 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
(h) Do these steps if you install the spiralock nuts (4):
1) Make sure nuts do not have rundown resistance. If nuts have rundown resistance, inspect the studs for any sharp threads or any rounded threads.
2) If the studs have any sharp threads or any rounded threads, replace the terminal block assembly (AMM 24-11-20/401).
CAUTION:_______DO NOT INSTALL ANY WASHER UNDER THE PHASE LEADS. THE PHASE LEADS MUST BE IN DIRECT CONTACT WITH THE THROUGH LEADS. IF YOU INSTALL WASHER UNDER THE PHASE LEADS, LOCALIZED RESISTANCE HEATING CAN OCCUR WHICH COULD CAUSE THE TERMINAL BLOCK TO BURN.
(i) Install the spiralock nuts (4), the self-locking nuts, or the washers and terminal nuts on the terminal studs.
NOTE: If you install the spiralock nuts or the self-locking
____ nuts, do not install the terminal washers.
CAUTION: MAKE SURE THAT YOU TIGHTEN THE NUTS TO THE SPECIFIED
_______ TORQUE VALUE. A LOW TORQUE ON TERMINAL NUTS WILL CAUSE LOW CONDUCTIVITY OF THE PHASE LEAD. LOW PHASE LEAD CONDUCTIVITY WILL RESULT IN RESISTANCE HEATING AND BURNING OF THE PHASE LEAD AND THE TERMINAL BLOCK.
(j)
Tighten the terminal nuts to 144-168 pound-inches (16-19 Newton-meters). 1) Make sure the terminal studs do not rotate when the
terminal nuts are tighten. If the terminal studs rotate when the nuts are tighten, replace the terminal block (AMM 24-11-20/401).
(k)
Install the terminal block cover (3). Tighten the screws (1) to 20-22 pound-inches (2.3-2.5 Newton-meters).
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