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Home›Engines›Kohler CH740 or CH1000

Kohler CH740 or CH1000 Engine

The Kohler CH740 or CH1000 is a 2-cylinder air-cooled engine. It powers generator sets from Kohler, including the RDC2 or DC2 and TP-6804.

Also known as: Kohler CH740 or CH1000

2
Cylinders
On this pageSpecsGenerator setsMaintenanceFAQProcedures

Engine specifications

Cylinders2
Aspirationair-cooled

Generator sets powered by this engine

2
Kohler RDC2 or DC2Kohler TP-6804

How to read your Kohler engine serial & model number →

Common problems

12
  • Generator set stops suddenly
    Cause: Low oil pressure shutdown
    Fix: Check for oil leaks. Check the oil level and add oil if necessary
  • The generator set cranks but does not start, starts hard, lacks power, or operates erratically
    Cause: Air cleaner clogged
    Fix: Clean and/or replace the air cleaner
  • The generator set does not crank
    Cause: Battery weak or dead
    Fix: Recharge or replace the battery
  • No AC output
    Cause: Line circuit breaker in the OFF position
    Fix: Place the circuit breaker in the ON position
  • MainPwrOverL Shutdown — controller internal circuit protection activated MainPwrOverL Shutdown
    Fix: Press OFF to reset. Contact an authorized Kohler distributor/dealer for service
  • Low output or excessive drop in voltage
    Cause: Generator set overloaded
    Fix: Reduce the load
  • Controller display is off
    Cause: Low or no battery voltage
    Fix: Check connections; Check generator set battery
  • Controller display backlight is off
    Cause: Backlight turns off after about 1 minute with no activity
    Fix: Backlight will turn on when a button is pressed or the generator set starts
  • Accy PwrOver Warning — controller internal circuit protection activated Accy PwrOver Warning
    Fix: Press OFF to reset. Contact an authorized Kohler distributor/dealer for service
  • Generator shuts down and controller displays a fault (underspeed, underfrequency, or undervoltage)
    Cause: Excess heat inside the enclosure tripped the thermostat
    Fix: Check for blocked air inlets and exhaust outlets; reset the thermostat
  • Bodily injury and/or equipment damage
    Cause: Battery short circuits
    Fix: Disconnect the battery before generator set installation or maintenance. Remove all jewelry before servicing the equipment. Use tools with insulated handles. Remove the negative (--) lead first when disconnecting the battery. Reconnect the negative (--) lead last when reconnecting the battery. Never connect the negative (--) battery cable to the positive (+) connection terminal of the starter solenoid. Do not test the battery condition by shorting the terminals together.
  • Battery short circuits
    Fix: Disconnect the battery before generator set installation or maintenance. Remove all jewelry before servicing the equipment. Use tools with insulated handles. Remove the negative (--) lead first when disconnecting the battery. Reconnect the negative (--) lead last when reconnecting the battery.

Compiled from service & troubleshooting documentation across every generator set that uses the Kohler CH740 or CH1000.

Maintenance schedule

ItemSpecCapacityPart #Interval
Air filterKOHLER OE—1200 hr
Fuel filterKOHLER OE—1200 hr
Oil filterKOHLER OE—1200 hr
BatteryBattery gases. Explosion can cause severe injury or death.—1800 hr
BeltInspect belts for wear and replace as necessary.—2400 hr
CoolantDOT5.110.0 L—3600 hr
Oil5W-404.5 L—1200 hr
Spark plug—1000 hr

Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.

Procedures

12
Étalonnage du contrôleur RDC/DC adjustment

⚠ Observer les précautions de sécurité indiquées dans le manuel d'installation de groupe électrogène.

Tools: Voltmètre numérique

  1. Mesurer la tension réelle du secteur au niveau de L1 et L2 avec un voltmètre numérique.
  2. Cliquer sur Calibrate (Étalonner) dans le ruban en haut de l'écran SiteTech.
  3. Tapez la tension mesurée dans la fenêtre d'étalonnage d'appareil.
  4. Cliquer sur le bouton Calibrate (Étalonner) dans la fenêtre d'étalonnage.
Obtain DC2 Controller Password and Serial Number diagnostic
  1. Press OFF and verify that the generator set is not running.
  2. Press and hold the Exercise button until Press Again to Reset OnCue Plus PW is displayed.
  3. Release the Exercise button and press it again within 5 seconds.
  4. Write down the serial number (S/N) and password.
Obtain RDC/DC Controller Password diagnostic
  1. Press OFF to place the controller into OFF mode.
  2. Press the down arrow button (RDC) or exercise button (DC) 5 times.
  3. Note the four-digit code displayed on the controller; this is the controller password.
  4. Write down the password and press OFF to clear the display.
Obtain RDC2 or VSC Controller Password and Serial Number diagnostic
  1. Press the controller down arrow button to navigate to the Networking Information menu.
  2. Follow the reset password procedure shown in Figure 1-3.
  3. Write down the serial number (S/N) and password displayed for 10 seconds.
Power Cycle the Controller diagnostic
  1. Disconnect all input power for two minutes to allow capacitors to discharge.
  2. Remove the battery negative cable or disconnect P1 from the back of the controller.
  3. Disconnect the battery charger 120 VAC input power supply or disconnect P5 from the back of the controller.
  4. Unplug the USB mini-B connector from the front of the controller if plugged in.
  5. Wait two minutes, then reconnect power, hooking up battery power (P1) first.
Use Telnet to Check Server Connection diagnostic

Tools: Command prompt, Telnet Client

  1. Activate Telnet Client on the computer if necessary.
  2. Open a command prompt window.
  3. Enter telnet devices.kohler.com 5253.
  4. Successful connection displays the symbols shown in Figure 3-8.
Connect OnCue Plus for RDC/DC installation
  1. Install the Ethernet option board on the generator set controller. See TT-1566.
  2. Connect a network cable from the Ethernet board to your router or modem.
Connect OnCue Plus for RDC2/DC2/VSC installation
  1. Set the controller password before connecting the generator set Ethernet cable to the router.
  2. Connect the RJ45 inline connector included in the OnCue Plus kit to the Ethernet cable inside the generator enclosure.
  3. Connect one end of the customer-provided network cable to the RJ45 connector.
  4. Connect the other end of the network cable to the customer router or modem.
Connexion USB d'un appareil installation

⚠ Ne pas utiliser de connecteur micro-B.

Tools: Câble USB (type-B ou mini-B)

  1. Connecter un câble USB doté du connecteur approprié (type-B standard pour ADC IId, mini-B pour les autres appareils).
  2. Sélectionner No, not at this time (Non pas pour le moment) et cliquer sur Next (Suivante).
  3. Sélectionner Install the software automatically (Installer le logiciel automatiquement) et cliquer sur Next.
  4. Cliquer sur Finish (Terminer).
Install OnCue Plus Wireless for RDC2/DC2 installation
  1. Set the controller password.
  2. Follow instructions in TT-1618 to install, connect, and set up the wireless access point.
  3. The customer must have a wireless router for Internet access.
Installer SiteTech installation
  1. Lire l'écran de contrat de licence et cocher la case indiquant l'acceptation des termes.
  2. Cliquer sur Install (Installer) et patienter pendant l'installation.
  3. Cliquer sur Finish (Terminer).
Mise à jour du progiciel maintenance

⚠ Pour le RSA II uniquement : ne pas tenter de mettre à jour le progiciel sur les tableaux d'alarme RSA II à l'aide de la version 1.0 du progiciel.

⚠ Les contrôleurs Decision-Maker 550 et 6000 exigent un logiciel chargeur de programme pour la mise à jour du progiciel.

Tools: Câble USB

  1. Télécharger le nouveau fichier de progiciel (.bin) depuis TechTools ou le portail des revendeurs Kohler.
  2. Connecter l'appareil à un port USB du PC.
  3. Démarrer SiteTech (Start>Programs>Kohler SiteTech) et laisser reconnaître l'appareil.
  4. Cliquer sur Update Firmware (Mettre à jour progiciel).
  5. Cliquer sur Browse (Naviguer), sélectionner le fichier .bin et cliquer sur Open (Ouvrir).
  6. Vérifier la version courante et la nouvelle version, puis cliquer sur Update Firmware.
  7. Cliquer sur Close (Fermer) quand Firmware Updated Successfully s'affiche.

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Common questions

Which generators use the Kohler CH740 or CH1000 engine?

The Kohler CH740 or CH1000 powers 2 generator set(s), including Kohler RDC2 or DC2, Kohler TP-6804.

How often should you change the oil in the Kohler CH740 or CH1000?

The Kohler CH740 or CH1000 oil change interval is every 1200 hours.

What is a common problem with the Kohler CH740 or CH1000 engine?

A commonly reported issue on generators using the Kohler CH740 or CH1000 is: Generator set stops suddenly. Cause: Low oil pressure shutdown. Fix: Check for oil leaks. Check the oil level and add oil if necessary.