(2)
Remove the access panel from the inner surface of the door.

 (3)  
Lubricate the cargo door (Fig. 301).

 (4)
Install the access panel on the inner surface of the door.

 (5)
Install the insulation on the inner surface of the door.

 S 013-003
 S 643-004
 S 423-005
 S 423-006
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A

737-300/400/500MAINTENANCE MANUAL
CARGO DOOR SEE A
CABLE MECHANISM BALANCE SEE D 
LATCH ROLLER SEE B  SPRING BALANCE MECHANISM 
SEE  E 
LATCH ROLLER 
SEE  B 
BEARING HOUSING TORQUE TUBE SEE C  FWD 
CARGO DOOR 
A  1 
1 2  AIRPLANES WITH UPLATCH AIRPLANES WITH COUNTERBALANCE MECHANISM 
Figure 301 (Sheet 1) Cargo Door Lubrication 

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737-300/400/500
MAINTENANCE MANUAL

SEE B LATCH ROLLER  FOR CLARITY REMOVED INNER SKIN 
FWD INBD  SEE C TORQUE TUBE BEARING HOUSING  SEE B SEE F LATCH ROLLER ROLLER COUNTER BALANCE 
ACARGO DOOR 2 
Figure 301 (Sheet 2) Cargo Door Lubrication 

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A 737-300/400/500MAINTENANCE MANUAL
LATCH ROLLER
FLUSH

MIL-G-23827
(1 LOCATION)

LATCH ROLLER 1 POINT
B3
TORQUE TUBE
BEARING HOUSING
FLUSH
MIL-G-23827
(1 LOCATION)

TORQUE TUBE BEARING HOUSING 1 POINT
3 THERE ARE TWO LATCH ROLLERS
C
ON EACH CARGO DOOR
Cargo Door Lubrication Figure 301 (Sheet 3)
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737-300/400/500
MAINTENANCE MANUAL

BALANCE MECHANISM CABLE
OR
MIL-G-25760 (1 LOCATION) 4
BALANCE MECHANISM CABLE 
1 POINT 
D  1 
COUNTER BALANCE 
SPRING ATTACH BOLT 
BMS 3-23 
(1 LOCATION) 

BALANCE MECHANISM SPRING 1 POINT
E1 4
AIRPLANES WITH A 7 X 19 CARBON STEEL CABLE
ONLY. LUBRICATION IS NOT REQUIRED ON
AIRPLANES WITH A 7 X 7 CORROSION RESISTANT
STEEL CABLE. REMOVE THE INSULATION PAD TO
GET TO THE CABLE. REFER TO 12-26-0 FOR
CABLE LUBRICATION PROCEDURE.

Cargo Door Lubrication Figure 301 (Sheet 4)
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A 737-300/400/500MAINTENANCE MANUAL

APPLY 5 TO 6 SHOTS OF GREASE AND THEN CYCLE DOOR. APPLY MORE GREASE IF NECESSARY.
Cargo Door Lubrication Figure 301 (Sheet 5)
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