B.  
Access

 (1)  
Location Zone
 801 Nose Cargo Door

 C.  
Prepare For Removal

 S 494-002
 (1)  
Install the safety barrier across the door opening.

 S 484-003

 (2)  
Supply electrical power (Ref 24-22-00/201).

 S 864-004

 (3)  
Open the nose cargo door to get access to the push-pull cam mechanism.

 NOTE: The push-pull cam actuator must be in the fully extended
____ position during the removal and installation of the push-pull cam mechanism.
 S 864-005
 (4)
Open these circuit breakers and attach the DO-NOT-CLOSE tags:

 (a)  
On the Auxilary External 2 Power Center-Right panel P715: 1) NOSE CARGO DOOR

 (b)  
On the Power Distribution Center-Right panel P415: 1) 415F16, NOSE CARGO DOOR CONTROL

 (c)  
On the Nose Cargo Door Power panel H122: 1) DOOR LIFT 2) PULL UP CAM

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A

747-400
MAINTENANCE MANUAL

PUSH-PULL CAM 
SEE  A  CAM ROLLERS  A 
ELECTRICAL 
CABLE  ACTUATOR 
PUSH-PULL  ROD END 
CAM 
ACTUATOR 
CAM ROLLER 
SUPPORT FITTING 
BOLT 
A  CAM SUPPORT 
FITTING 
BOLT 
NOTE: ACTUATOR IS SHOWN____ 
FWD  FULLY CLOSED. 
BOLT 
A 

Nose Cargo Door Push-Pull Cam Mechanism Installation
Figure 401 (Sheet 1)

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B26923
A
747-400
MAINTENANCE MANUAL

SUPPORT FITTING
SERRATED PLATES
B-B Nose Cargo Door Push-Pull Cam Mechanism Installation Figure 401 (Sheet 2)

B26924
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 D.
E.
F.
G.
A
747-400 MAINTENANCE MANUAL
 3) LATCHES 1-4R
 4) LATCHES 1-4L
 5) LATCHES 5-8R
 6) LATCHES 1-4L

 S 024-038
 (5) Disconnect the electrical connector from the push-pull cam actuator.Push-Pull Cam Actuator Removal
 S 024-006
 CAUTION: DO NOT CLOSE THE NOSE CARGO DOOR WITH THE PUSH-PULL CAM
_______ ACTUATOR REMOVED. THIS CAN CAUSE DAMAGE TO THE PUSH-PULL CAM AND CAM ROLLERS.
 (1)  Remove the atachment bolts, nut and washers on the support fitting
 and cam and remove the actuator.Push-Pull Cam Removal
 S 034-007
 (1)  
Make sure the actuator pushrod is disconnected from the cam.

 S 024-008

 (2)
Remove the attachment bolts, nuts, and washers and remove the cam.Cam Support Fitting Removal

 S 214-009

 (1)  
Make sure the actuator pushrod is disconnected from the cam.

 S 034-010

 (2)  
Remove bolt, nut, and washers that attach the push-pull cam to the cam support fitting and remove the cam, if it is necessary.

 S 024-011

 (3)  
Remove the atachment bolts and remove the support fitting, shims and fillers.

 NOTE: Make sure to keep shims and fillers for installation.
____
Cam Roller Support Fitting Removal
 S 024-012
 (1)  Remove the attachment bolts and remove the support fitting, shims and serrated plates.
　
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