Detailed Inspection of PDU Rollers for Wear and Damage

TASK 25-50-00-200-018-A
Detailed Inspection of PDU Rollers for Wear and Damage

WARNING: DO NOT TOUCH THE POWER DRIVE UNIT:

UNTIL IT IS SUFFICIENTLY COOL TO PREVENT BURNS WHEN YOU DO THE MAINTENANCE TASK(S)
DURING OPERATION TO PREVENT INJURY FROM PARTS THAT TURN.

ZONE: 130
ZONE: 150

1. Reason for the Job
Refer to the MPD TASK: 255000-07
DETAILED INSPECTION OF PDU ROLLERS FOR WEAR AND DAMAGE
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 2M (6 FT)
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	1	VACUUM CLEANER
No specific	1	WARNING NOTICE(S)
ES750-51	1	GAUGE-ENDPIECE

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
130	FWD CARGO COMPT AFT BULKHEAD OF AVNCS COMPT TO FWD PRESSURE BULKHEAD OF WING CENTER BOX
150	AFT CARGO COMPARTMENT FWD PRESS BULKHEAD TO AFT BULKHEAD OF AFT CARGO COMPARTMENT

C. Referenced Information

REFERENCE	DESIGNATION
TASK 25-52-26-000-002-A	Removal of the Roller Assembly
TASK 25-52-26-400-002-A	Installation of the Roller Assembly
TASK 52-30-00-860-001-A	Open the FWD or Aft Cargo-Compartment Door with the Yellow Electric Pump
TASK 52-30-00-860-002-A	Close the FWD or Aft Cargo-Compartment Door with the Yellow Electric Pump
Power Drive Unit (PDU) - Cleaning Area
Power Drive Unit (PDU) Roller - Permitted Damage

3. Job Set-up
Subtask 25-50-00-010-088-A ** ON A/C NOT FOR ALL

A. Get Access
(1) Open the forward and/or aft cargo-compartment door(s) (Ref. AMM TASK 52-30-00-860-001).
(2) Put the ACCESS PLATFORM 2M (6 FT) in position at the opening of the forward and/or aft cargo-compartment door(s).
(3) Put the WARNING NOTICE(S) on the control panel(s) of the Cargo Loading System (CLS) to tell persons not to use it.

Subtask 25-50-00-865-147-A ** ON A/C NOT FOR ALL

B. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
2000VU	SEMI AUTO CLS-FWD	3MY	E08
2000VU	SEMI AUTO CLS-FWD	2MY	E06
2001VU	SEMI AUTO CLS-AFT	103MY	D08
2001VU	SEMI AUTO CLS-AFT	102MY	D06

4. Procedure
Subtask 25-50-00-210-093-A ** ON A/C NOT FOR ALL

A. Detailed Inspection of Power Drive Unit (PDU) Roller
(1) Clean the component interface and/or adjacent area with a VACUUM CLEANER.

Power Drive Unit (PDU) - Cleaning Area ** ON A/C NOT FOR ALL

(2) Examine the PDU roller for cracks or other damages.

Power Drive Unit (PDU) Roller - Permitted Damage ** ON A/C NOT FOR ALL

(3) Make sure that the rubber of the roller assembly is not loose.

NOTE: Rubber separation is not permitted. Cuts and fissures in the rubber are permitted.

(4) Use the ES750-51 GAUGE-ENDPIECE to find if the diameter of the PDU roller is less than permitted. As an alternative, you can measure the diameter of the PDU with a caliper.
(a) Do not use force to push the gage tool over the PDU roller.
(b) Put the gage tool on the PDU roller:

If you can put the gage tool over the roller, you must replace the roller (Ref. AMM TASK 25-52-26-000-002) (Ref. AMM TASK 25-52-26-400-002).
If you cannot put the gage tool over the PDU roller, the roller is in the correct condition.

(5) Make sure that the roller has a minimum of 70% of its rubber surface.

NOTE: Rubber break-outs from the edges of the roller assembly are permitted.

5. Close-up
Subtask 25-50-00-860-076-A ** ON A/C NOT FOR ALL

A. Make sure that the work area is clean and clear of tools and other items.

Subtask 25-50-00-865-148-A ** ON A/C NOT FOR ALL

B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
2000VU	SEMI AUTO CLS-FWD	3MY	E08
2000VU	SEMI AUTO CLS-FWD	2MY	E06
2001VU	SEMI AUTO CLS-AFT	103MY	D08
2001VU	SEMI AUTO CLS-AFT	102MY	D06

Subtask 25-50-00-410-082-A ** ON A/C NOT FOR ALL

C. Close Access
(1) Remove the WARNING NOTICE(S).
(2) Remove the access platform(s).
(3) Close the forward and/or aft cargo-compartment door(s) (Ref. AMM TASK 52-30-00-860-002).

[Rev.10 from 2021] 2026.04.02 06:14:20 UTC