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A 747-400 MAINTENANCE MANUAL
 3) 4) 5)  Hold the LOCAL DRIVE switch to the FWD position.Make sure the drive-wheel moves and stops at the 22-degree clockwise position then turns in the forward direction.Adjust the PDU limit switches if the drive-wheel did not stop at the applicable angular position (AMM 25-57-00/501).
 NOTE:____ The angular position of the drive-wheel must be less than |1.0 degree of the applicable angular position.
 (f) (g) (h)  Move the P29 ARMING-OFF/ARM switch to the OFF position at the local cargo control panel 22AR.Push the SYSTEM POWER STOP switch momentarily on the master cargo control panel (M1).Remove the electrical power if it is not necessary (AMM 24-22-00/201).

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747-400 MAINTENANCE MANUAL
 RETRACTABLE POWER DRIVE UNIT (PDU) - INSPECTION/CHECK
_____________________________________________________
 1.  General
_______
 A.  This procedure contains a task to do an inspection/check of the
 retractable PDU.

 B.  You do not have to remove the PDU to do the inspection/check procedure of the retractable PDU.
 NOTE: Make sure the area around retractable PDU's is free of dirt and
____
 debris.

 TASK 25-57-01-206-001
 2.  Inspection/Check - Retractable PDU
__________________________________
 A.  Equipment
 (1)
Grease - MIL-G-23827

 (2)
Dry Lubricant - MIL-L-23398

 B.  References
 (1) 25-57-02/401, PDU Steering Actuator
 C.  Access
 (1)  Location Zone
 210 Main Deck

 D.  Procedure
 S 826-022
 (1) Lateral adjustments of the limit switches is not possible.
 S 786-005
 WARNING: MAKE SURE THE PRESSURE OF THE WORN OUT/DEFECTIVE TIRE IS NOT
_______ MORE THAN 100 PSIG. IF THE PRESSURE OF THE WORN OUT/DEFECTIVE TIRE IS MORE THAN 100 PSIG, THE TIRE CAN EXPLODE. THE EXPLOSION CAN CAUSE INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT.
 (2) Check tire for damage and excessive wear.
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747-400 MAINTENANCE MANUAL
 (3)  S 616-024Make sure the tires are inflated to 125-130 psi.
 (4)  S 016-007Get access through the ceiling door under PDU in the aft lower cargo compartment.
 (5)  S 166-006Clean the dirt and debris from the pan and the near area.
 (6)  S 866-008Remove power from the PDU(s) and steering actuators.
 (7)  S 216-009To examine the wire harness, do the steps that follow: (a) Make sure the drive motor wire bundle is properly in position to prevent interference. (b) Make sure all PDU actuator, limit switch and steering actuator wire bundles do not have wear and abrasion. (c) Make sure the electrical relay cover is properly installed and is not damaged. If relay cover is damaged or not installed, examine the relay for damage.
 (8)  S 646-013Use the grease gun to lubricate cam follower needle bearings.
 (9)  S 646-014Clean off excessive grease.
 S 226-015

 (10)
 Make sure the cam follower needle bearings turn freely and replace as necessary.

 S 646-017

 (11)
 Clean and lubricate (with dry lubricant) the cam tracks as necessary.

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