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 length (Fig. 402, details A and B).
 1) Turn the cable adjustment fitting until the groove in the
 cam axle aligns with the correct mark on the counterbalance
 assembly.
 S 714-062-B00
 (3)  Do a check of the alignment of the cable with the door open.
 (a) Open the door.
 (b) Make sure the cable aligns correctly when the door is open.
 (c) Adjust the alignment of the cable again if it is necessary.
 S 844-054-B00
 (4)  Remove the nut and washer from the counterbalance shaft.
 S 714-055-B00
 (5)  Use the spring scale to do a check of the force necessary to open
 and close the door at the external latch handle:
 (a) The maximum handle force, measured at exterior handle and
 normal to the door outer skin, required to raise the door into
 the open position shall be 25 pounds.
 (b) The maximum handle force, measured at the exterior handle and
 normal to the door outer skin, required to lower the door until
 the latch rollers contact the latch receivers shall be 35
 pounds.
 S 214-066-B00
 (6)  When the cargo door is open, make sure that the cargo door touches
 the bumper pad (Fig. 402, detail C).
 S 824-056-B00
 (7)  Adjust the spring compression of the balance mechanism to change the
 force if it is necessary:
 (a) Remove the wire that locks the nut on the counterbalance shaft.
 (b) Turn the adjustment fitting on the counterbalance shaft so that
 when the cargo door is open it touches the bumper pad.
 (c) Turn the adjustment fitting as it is necessary to get the
 correct force.
 (d) Lock the nut on the counterbalance shaft with the wire.

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A
737-300/400/500MAINTENANCE MANUAL
BALANCE MECHANISM CABLE
COUNTERBALANCE
DOOR LANYARD  GUIDE PIN 
PULLEY B  1 
COUNTERBALANCE ASSEMBLY  SLEEVE  WASHER 
SEE  A 

SCREW 
COUNTERBALANCE 
GUIDE PIN 
B  2 
CABLE MECHANISM BALANCE  CABLE RETAINING PLATE AND SCREW  COUNTERBALANCE
 ATTACH BOLTS 
DRUM 

ADJUSTMENT
COUNTERBALANCE
FITTING
ATTACH BOLTS
ROLLER (DOOR OPEN)  (DOOR CLOSED) ROLLER  GUIDE PIN COUNTERBALANCE 
COUNTERBALANCE ASSEMBLY  SEE  B 
A 
1 2  ON COUNTERBALANCES WITHOUT SLEEVE, WASHER AND SCREW ON COUNTERBALANCES WITH SLEEVE, WASHER AND SCREW. 

Cargo Compartment Door Balance Mechanism
Figure 401

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A

737-300/400/500MAINTENANCE MANUAL
BALANCE MECHANISM CABLE
BUMPER PAD SEE A SEE C 2 CABLE CLIP  ASSEMBLY COUNTERBALANCE 
SEE B 1 ADJUSTMENT CABLE 
CARGO DOOR 
CAM AXLE COUNTERBALANCE ASSEMBLY  FLOOR BEAM 
FWD  AFT  BUMPER PAD FITTING DOORSTOP  CEILING PANEL 
FORWARD DOOR MARK FOR AFT DOOR MARK FOR CABLE ADJUSTMENT  BUMPER PAD  CARGO DOOR 
B  1  A  2 
2 1  CABLE CLIP WITH A SHEAVE SHOWN WITH CARGO DOOR FULLY OPEN 
Counterbalance Cable Alignment Figure 402 (Sheet 1) 

G11357
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
SUPPORT
FLOOR BEAM
ANGLE
　
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