Kohler S340+ Automatic Transfer Switches Service and Parts Manual (tp5671)

These Kohler S340+ automatic transfer switches sit between your utility and generator, usually in plant rooms, data centers, or commercial buildings, making sure power swaps over cleanly when the grid drops. This parts manual helps you match every relay, coil, terminal block, and enclosure piece to the correct Kohler part number before you order. In the shop, I’d use it when a switch won’t transfer back to utility and I’ve traced the fault down to a damaged mechanical linkage or burned contact kit, so I can identify the exact replacement that fits this S340+ variant.

Applications & Use Cases

• Confirm the exact switch variant so you don’t mix up parts between similar Kohler ATS models.
• Match teardown components to the illustrated breakdowns before rebuilding a contactor or mechanism.
• Verify small hardware and brackets so you replace missing pieces with the right fasteners and supports.
• Cross-check old or superseded numbers against current Kohler part listings when restocking spares.
• Plan a rebuild or upgrade by listing every gasket, shunt, and terminal you’ll need in one pull.

FAQ

Q: Can I use this on a tablet in the field?

A: Yes, it works well digitally; you can zoom in on diagrams to confirm small parts before ordering.

Q: Is it worth printing sections of this manual?

A: For bench work, printing the relevant pages keeps the exploded views and part numbers right beside the switch.

Safety Note

Always isolate and lock out all power sources before opening or servicing any automatic transfer switch.

Kohler S340+ Automatic Transfer Switches Index:

Safety Precautions and Instructions
Introduction
List of Related Manuals
Service Assistance

Section Specifications
Purpose of Switch
Components of Switch
Ratings
Interpreting a Transfer Switch Part Number
Specifications
Standard Features
Optional Features

Section Operation
Control Switches and Indicators
Sequence of Operation
Normal Source Failure
Normal Source Restoration
Voltage Checks
To Disconnect the P1 Plug
Electrical Operation Test

Section Main Circuit Board Adjustments
Voltage Adjustments
Circuit Board Switch Settings
Circuit Board Calibration
Time Delay Adjustments

Section Controller Troubleshooting
Logic Board Troubleshooting
Interface Relay Board Troubleshooting

Section Accessory Troubleshooting
Optional Accessories
Standard Features Troubleshooting
Test Selector Switch
Pilot Lights
Optional Features Troubleshooting
Accessory Operation Mode Selector Switch with Lamp
Auxiliary Relay Contacts
Seven Day Solid State Exercise Timer
Battery Charger
To Disconnect Charger When Replacing or Servicing Battery
Battery Charger Operation
Charging Lead Acid Batteries
Checking Specific Gravity
Charging Nickel Cadmium Batteries
Charger Voltage Adjustment
Charger and Battery Maintenance
Battery Charger Wiring Diagrams

Section Wiring Diagrams

Section Service Parts
Inner Panel
Accessories
Time Delay
Test Switch
Auxiliary Contacts Relay
Plant Exercisers
Battery Chargers

Appendix Glossary of Abbreviations

Kohler