TLD GPU-406, Manual

Page: 13 / 74

Creation: 01.31 - 2014 2-1-9
GPU - 406
GPU - 409
F. Belts
A single poly-V belt driven by the engine crankshaft pulley is used to drive the battery charging
alternator, the radiator fan, and the engine coolant pump. The belt system is equipped with an
automatic tensioner which eliminates the need for periodic tensioning. The belt must be inspected
on a regular basis and replaced when excessive stretch or cracking are present.
The belt is replaced as follows:
1. Turn off the unit battery switch
2. Open the doors to the unit on both sides for access.
3. Remove the overflow bottle from alternator guard on the left side of the unit and set it
aside carefully.
4. Remove the alternator guard.
5. Remove the fan guard from the radiator.
6. Rotate the tensioner to relieve tension on the drive belt and, while holding tensioner,
remove the belt from the alternator pulley.
7. Release the tensioner.
8. Make note of the routing of the belt and remove it from the pulleys.
9. Remove the belt by moving it over the fan blades.
10. Installation is the reverse of the removal.
G. Generator Maintenance
The 400 Hz generator requires no maintenance or service other than periodic cleaning. Refer to
the specific generator manual in chapter 5 for more information.
(1) Cleaning
When inspection determines that cleaning is necessary, clean the generator as follows.
(a) Wipe loose dirt from the exterior painted surfaces with a clean lint-free cloth. Remove
stubborn accumulations of dirt with an approved detergent or solvent. Clean all ventilating
parts with a vacuum cleaner or filtered compressed air at a pressure of 25 to 40 psi.
(b) Clean the inside of the generator with a vacuum cleaner or use dry filtered air at a
pressure of 25 to 40 psi. Remove stubborn accumulations of dirt and grease from
windings with naphtha.
(c) Clean electrical contacts such as relay contacts, switch contacts, and terminals with an
approved contact cleaner.
WARNING:
USE EXTREME CARE WHEN USING NAPTHA. USE ONLY IN
WELL VENTILATED AREAS, AWAY FROM OPEN FLAMES AND
SPARKS.
NOTE:
Do not file contacts.
Property of American Airlines