Cummins/Onan QST30 — Keyed Connector Backshell Assembly
Installation · ECM connector backshell
For the Cummins/Onan QST30, from the Cummins/Onan service manual.
Applies to: Cummins/Onan QST30
Procedure
- Position connector grommet seal on backside of connector.
- Strip 4.3 to 5.4 mm insulation from wire harness conductors.
- Crimp connector terminals onto stripped ends using crimp tool.
- Insert each terminal into correct cavity of connector.
- Insert sealing plug into each open cavity position.
- Ensure all terminals are properly seated.
- Place connector into one half of keyed backshell.
- Attach strain relief clamp over harness bundle to backshell half.
- Place two thumbscrews into proper locations of backshell half.
- Place second backshell half and fasten halves together.
Tools required
- Wire Strippers Amazon
- Standard Screwdriver
- Terminal Crimp Tool Amazon
- Terminal Insertion/Extraction Tool Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Thumbscrews torque 0.79 - 0.90 N·m (7-8 in-lb)
Full service-parts list: Cummins/Onan QST30 →
Source: Cummins/Onan service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.