H20814
Constant Speed Drive Leak Check 500
24-11-0 Figure 201 Jun 20/85
Page 202
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
F. Pressure should bleed off to a slightly lower value (due to CSD vent valve setting) and then stabilize.
G. If pressure continues to lower, visually check for leak source. If leak source is not apparent, check system for leaks using soap suds or equivalent leak detector fluid.
H. Depressurize CSD and disconnect tester.
I. If required, repair leak and repeat check.
500
Jun 20/85 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 24-11-0 Page 203
GENERATOR CONSTANT SPEED DRIVE - REMOVAL/INSTALLATION
1. General
A. The generator constant speed drive (CSD) and the ac generator may be removed and installed as a complete assembly or as separate units. If these operations are being performed without the aid of a cradle assembly, it will be easier to remove and install them separately. A quick-attach-detach (QAD) locking ring facilitates removal and installation of the CSD or of the CSD and generator assembly.
CAUTION: DURING ALL MAINTENANCE ON CONSTANT SPEED DRIVE, CLEANLINESS IS ABSOLUTELY ESSENTIAL. TAKE ALL POSSIBLE PRECAUTIONS TO PREVENT FOREIGN MATTER FROM ENTERING DRIVE SYSTEM.
B. Replace line oil filter element and check oil and magnetic plug each time CSD is replaced. Flush oil cooler if oil shows signs of sludging. Replace oil cooler and tubing if bright metal deposits of chips or flakes are on the magnetic plug. Replace oil cooler and tubing if CSD is being replaced due to a possible internal failure and there is evidence of contamination in the system. Check CSD for wear (Ref 24-11-11 I/C) if the removed CSD is to be reinstalled.
2. Equipment and Materials
A. Oil - MIL-L-7080, or any oil conforming to Pratt & Whitney specification PW-521B Type I or Type II (Ref 20-30-21)
B. Anti-fretting compound - Sundstrand 730691 (preferred); Sundstrand 718050 (alternative); Sundstrand 688272 (alternative); or 1:1 mixture by weight of molybdenum disulfide, MIL-M-7866, and Rheotemp 500 (or Texaco Unitemp 500) grease (alternative) (Ref 20-30-21)
C. Lubricant, O-ring - Acryloid HF866 (preferred) or HF825 (alternative) (Ref 20-30-21)
D. Adapter Assembly, AC Generator and Constant Speed Drive for supporting CSD and/or generator during removal/installation, Boeing F70333-25
NOTE: Boeing F70333-25 replaces F70333-1 replaces F80011-1, -16; F70333-24 replaces F70333-21 assembly.
Boeing F70333-21, -24 adapter assembly and jack includes a commercially available jack plus F70333-1, -25.
E. Cleaning Solvent - P-D-680 (Ref 20-30-31)
3. Remove Generator Constant Speed Drive
A. Open control panel circuit breakers TEMP and LOW PRESS for generator drive and generator control circuit breaker No. 1 and 2 on panel P6 corresponding to generator CSD being removed.
B. Disconnect main electrical connector. (Use manufacturer's recommended procedures for disconnecting connections. Do not pull on wires.)
C. Disconnect and plug oil lines.
WARNING: USE EXTREME CARE WHEN DRAINING CSD OIL OR REMOVING CSD COMPONENTS. HOT OIL CAN CAUSE INJURY.
PROLONGED CONTACT WITH CSD OIL CAN CAUSE DERMATITIS. OIL WILL STAIN CLOTHING AND CAN SOFTEN PAINT.
500
Feb 20/87 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 24-11-11 Page 401
NOTE: If necessary, loosen release screws on quick-release clamps and move engine firewall fire detection sensing element to one side (Ref 26-11-11, R/I).
D. Remove ac generator (Ref 24-21-11).
NOTE: If proper equipment is available to handle the weight, generator may be left assembled to CSD. Removal of generator is optional.
E. Drain oil from drive tank (capacity about 4-1/2 quarts) by removing tank drain plug and loosening gravity fill plug. Replace tank drain plug and tighten both plugs finger-tight.
NOTE: Drain into 2-gallon can.
F. Drain oil from drain sump (capacity about 1 pint) and replace drain plug. Tighten plug finger-tight. (Use 3/4-inch wrench to remove plug).
G. Drain oil from drive input spline cavity (capacity 1-1/2 quarts) and replace drain plug
(1) Tighten the drain plug to 190-210 pound-inches.
H. Attach cradle assembly to drive housing.
I. Remove QAD tension bolt.
J. Provide adequate support for CSD.
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