(b)
Turn the QAD tension bolt to open the QAD ring. Align the mark on the QAD ring with the mark on the QAD engine adapter plate.
CAUTION:_______THE IDG MUST BE MOUNTED CORRECTLY. IF THE IDG IS NOT MOUNTED CORRECTLY DAMAGE TO MATING PARTS CAN OCCUR.
(c)
Align the IDG with the gearbox mount pad. Hold the IDG so that no weight is put on the input shaft.
(d)
Position the IDG to allow the lugs on the IDG input flange go into the QAD ring openings. Align the alignment mark on the QAD and the align mark on the IDG.
(e)
Make sure that the index pin on the IDG goes into the index pin hole on the QAD adapter.
(f)
Tighten the QAD tension bolt so the QAD ring lugs fully engage the input flange lugs of the IDG. Make sure that the ring moves freely and does not catch.
(g)
Tighten the QAD tension bolt as follows: 1) Torque the QAD tension bolt to 240-264 pound-inches (27-30 Newton-meters).
2) Use a brass drift to lightly hit the edge of the QAD coupling to prevent the incorrect values. Hit the ring as shown in Fig. 401.
3) Do a check of the torque value of the tension bolt.
4) If the torque is less than 180 pound inches (20 Newton-meters), tighten the tension bolt to 240-264 pound-inches (27-30 Newton-meters).
5) If the torque is greater than 180 pound-inches (20 Newton-meters), lightly hit the edge of the QAD coupling again.
(h)
Do the steps to tighten the QAD tension bolt again until the torque does not drop below 180 pound-inches (20 Newton-meters) after you hit the QAD coupling.
(i)
Torque the QAD tension bolt to 240-264 pound-inches (27-30 Newton-meters).
(j)
Remove the hoist adapter from the IDG.
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24-11-01
ALL ú ú 03 Page 409 ú Jan 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
(k) Measure the distance between the ring lug and the bracket on the QAD ring. If the distance is less than 0.562 inch
(14.28 mm), replace the QAD coupling (AMM 24-11-03/401).
NOTE: You can measure the distance between the centers of the
____ nuts in the QAD coupling tension bolt assembly. If the distance is less than 1.750 inches (44.45 mm), replace the QAD coupling.
S 434-007
(2)
Lock the QAD tension bolt with wire.
S 434-018
(3)
Install the oil-in and the oil-out tubing as follows:
(a)
Remove the plugs from the oil-in and the oil-out bosses on the IDG.
(b)
Remove caps from oil-in and oil-out line.
(c)
Connect the IDG oil-in tubing to the hose which is connected to the heat exchanger.
(d)
Lubricate a new O-ring (16) with engine oil and install the O-ring on the oil-in coupling.
(e)
Install the oil-in coupling in the IDG oil-in boss and tighten the coupling to a torque of 130-175 pound-inches (14.6-19.7 Newton-meters).
(f)
Lubricate a new O-ring (17) with engine oil and install the O-ring on the oil-out coupling.
(g)
Install the oil-out coupling in the IDG oil-out boss and tighten the coupling to a torque of 110-150 pound-inches (12.4-16.9 Newton-meters).
CAUTION: USE TWO WRENCHES TO HOLD FITTINGS WHEN YOU TORQUE THE
_______ OIL-IN AND OIL-OUT LINES. IF DOUBLE-WRENCH METHOD IS NOT FOLLOWED, EXCESS TORQUE MAY BE TRANSFERRED TO IDG FITTINGS. THIS COULD CAUSE DAMAGE TO THE IDG BOSSES.
(h)
Connect the oil-in line.
(i)
Connect the oil-out line.
S 434-019
(4) Install the pressure fill and overflow drain couplings as follows:
(a)
Remove plugs in the pressure fill boss and overflow drain boss on the IDG.
(b)
Get a new or shop-tested pressure fill elbow coupling (13) and install the drilled jamnut (12) on the pressure fill elbow coupling.
(c)
Lubricate a new O-ring (10) with engine-oil and install the O-ring on the pressure fill elbow coupling (13). The O-ring should be between the IDG and jamnut.
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