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 3.  Balance Mechanism
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 A.  Door balance is maintained by a spring-driven idler crank that drives a cam fixed to a cable drum. The springs, idler crank, cam and drum are all located in the counterbalance assembly mounted on the inner structure of the door. From the drum the cable runs over a pulley mounted on the inner structure of the door and connects to an overhead floor beam. The counterbalance mechanism is arranged so that the springs are compressed when the door is closed. When the door is opened the springs extend to drive the idler crank, cam and drum to raise the door.
 4.  Operation
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 A.  The door is opened from outside the airplane by pulling the door handle out of the recess and rotating the handle counterclockwise. Rotation of the handle actuates a torque tube to withdraw the latch rollers from the latch fittings. As the door swings inboard, under tension of the door balance mechanism, the door warning proximity switch is actuated to energize the appropriate door warning light in the control cabin. As soon as the door has moved clear of the latch fittings, the handle may be released. Springs within the handle will cause the handle to return to the normally locked and recessed position. With little manual effort, the door may be swung open until the idler crank in the counterbalance assembly engages a detent on the cam to latch the door open. The door may be opened from inside the airplane, using the nonretracting inner handle. In this case, the procedure is similar except that rotation of the handle appears clockwise to the operator. Access to the inside handle is obtained by pulling aside the cargo net which extends from the ceiling to the lower edge of the door.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL

LOCKING THE DOOR

Cargo Compartment Door Operation
Figure 2

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 B.  The door is closed by pulling on the lanyard to move the door down until the operating handle is within reach. The handle is then lifted from its recess and the lanyard is released. Counterclockwise rotation of the operating handle aligns the latch rollers with the latch fittings and allows the door to be pulled down and latched by a clockwise rotation of the handle. This final movement engages both latch rollers in the fittings and actuates the door warning proximity switch to de-energize the appropriate warning light in the control cabin. When the door is thus closed and latched, the handle may be released.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
CARGO COMPARTMENT DOORS - TROUBLE SHOOTING
1.  _____________________________________________________________Forward and Aft Lower Lobe Cargo Doors Trouble Shooting Chart
TROUBLE  PROBABLE CAUSE  REMEDY 
handle) inches on inner handle, or 300 pound-inches on outer grooves cable drum and bearing balance mechanism Excessive play between (Exceeds 400 pound-High closing torque on door handle mechanism cable drum Deformation of balance  sive play in drum Bearing wear allowing exces-ing being loose inside drum hinges where bottoming occurs excessive) outer race resulting in bear-by listening for bottoming of Locate point of interference mum) force of 80 pounds). while operating handle (maxi-ing on each corner of door Locate problem area by push-Wear or corrosion of bearing misalignment of upper door may be due to wear or allowable tolerance. This not match body contour within Door appears warped or does modeling clay to inspect stop pins, or cranks. Use Bottoming of latch rollers, when pulled out if contact is seal and structure will tear 1-inch wide trapped between seal plane. (A strip of paper Heavy contact of door seal on door on structure structure other than seal. Interference between door and  R/I) as necessary (Ref 52-31-00, fittings, stop pins, etc., Adjust latch roller stop along in channel loose enough to be pulled seal warpage. Seal should be channel and eliminate all Check seal retention in seal R/I) Adjust door (Ref 52-31-00, parts Replace worn or damaged parts Replace worn or corroded interference Eliminate source of 
　
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