7ISSUE DATE:
SERVICE BULLETIN SUBJECT:
VINs or MODELS AFFECTED:
COMPLETE BY:
SERVICE BULLETIN #:

12/7/2020
FC and E2 Charge Blade Loctite Retrofit
Service Specified Buses
Next Service Opportunity
SB-20-168

FC AND E2 CHARGE BLADE LOCTITE RETROFIT
NOTICE! It is expected that this process will require 1 hour per bus. Please
schedule appropriately to minimize vehicle downtime.

Retrofit Description:

It is expected that the fast charge blade be visually inspected as part of the standard Proterra
Catalyst FC and Catalyst E2 Preventative Maintenance Inspection Checklists. This bulletin clarifies
that the high voltage connections at the blade should be checked for proper torque values every 6000
miles and provides the replacement procedure in the event a fastener on the charge blade is found
loose or missing. The procedure specifies the fasteners, proper torque value, and required thread
locker.

Headquarters: 1815 Rollins Road, Burlingame, CA 94010
East Coast Manufacturing: 1 Whitlee Court, Greenville, SC 29607
West Coast Manufacturing: 383 Cheryl Lane, City of Industry, CA 91789

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Tools/Parts Required
Tools and Supplies Required:
•
•
•
•
•
•
•

Ratchet
5/8-Inch Allen Socket
4mm Allen Socket
Calibrated Torque Wrench
Loctite 271 Red Thread Locker
Alcohol
Shop Towels

Parts Required:
•
•
•

013096-010
017960
013100-012

SCREW,SHC,FLAT,SS, 0.25-20X1.0X1.0
NUT, HEX FLANGE, SS, .38-16 NON-SERRATED
SCREW, SHCS, FH, 3/8-16 X 1.5"-SS"

Headquarters: 1815 Rollins Road, Burlingame, CA 94010
East Coast Manufacturing: 1 Whitlee Court, Greenville, SC 29607
West Coast Manufacturing: 383 Cheryl Lane, City of Industry, CA 91789

8 EA
8 EA
8 EA

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Procedure:
1. Preform the Proterra approved Lockout/Tagout procedure to make the bus safe for work.
2. Using the appropriate safety measures, access the rooftop of the bus.
3. Open the Clamshell Doors on the rooftop of the bus to access the charge blade.
4. Using a Ratchet with a 5/8-Inch Allen Socket and a 9/16-Inch Combination Wrench, remove
one of the four screws and nuts shown circled in red on the Streetside of the Charge Blade.
Note: Replacement Screws (013100-012) and Locknuts (017960) are supplied. They should
be used to replace any damaged fasteners found in this procedure.

5. Using Alcohol and Shop Towels, clean and inspect the Screws and Locknuts. Replace them
with parts from the kit if they are damaged.
6. Apply a drop of Loctite 271 to the threads of the screw that was just removed.
7. Using a Ratchet with a 5/8-Inch Allen Socket and a 9/16-Inch Combination Wrench, reinstall
the screw and nut into the Charge Blade.
8. Using a Calibrated Torque Wrench with a 5/8-Inch Allen Socket, torque the screw to 150
Inch Pounds.
9. Repeat the process to apply Loctite 271 and properly torque the remaining three screws on the
Streetside of the bus.
10. Working on the Curbside of the bus, repeat the process to apply Loctite 271 and properly
torque the four screws on the Curbside of the Charge Blade.

Headquarters: 1815 Rollins Road, Burlingame, CA 94010
East Coast Manufacturing: 1 Whitlee Court, Greenville, SC 29607
West Coast Manufacturing: 383 Cheryl Lane, City of Industry, CA 91789

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11. Using a Ratchet with a 4mm Allen Socket, remove one of the four screws shown circled in red
on the Streetside of the Charge Blade.
Note: Replacement Screws (013096-010) are supplied. They should be used to replace any
damaged fasteners found in this procedure.

12. Using Alcohol and Shop Towels, clean and inspect the Screws. Replace them with parts from
the kit if they are damaged.
13. Apply a drop of Loctite 271 to the threads of the screw that was just removed.
14. Using a Ratchet with a 4mm Allen Socket, reinstall the screw.
15. Using a Calibrated Torque Wrench with a 4mm Allen Socket, torque the screw to 53 inch
pounds.
16. Repeat the process to apply Loctite 271 and properly torque the remaining three screws on the
Streetside of the bus.
17. Working on the Curbside of the bus, repeat the process to apply Loctite 271 and properly
torque the four screws on the Curbside of the Charge Blade.
18. Close the Clamshell Doors and exit the rooftop of the bus.
19. Remove the Lockout/Tagout devices and return the bus to service.

Headquarters: 1815 Rollins Road, Burlingame, CA 94010
East Coast Manufacturing: 1 Whitlee Court, Greenville, SC 29607
West Coast Manufacturing: 383 Cheryl Lane, City of Industry, CA 91789

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