How to Replace Cabin Light and Boom Lights in a Komatsu PC200LC Excavator

  • Written by Luis
Three red arrows pointing to two cabin lights and one boom light

Want to replace your cabin and boom lights on your Komatsu PC200LC Excavator? 

Here’s a detailed guide that takes you through all the steps of installing new LED lights on the cabin and excavator boom. LED lights are much more durable and energy-efficient – giving you more bang for your buck.

Service Call: Komatsu Excavator Repair on a PC200LC - Replace Cabin Light & Boom Lights
Fitting The Cabin Lights

Replacing cabin lights is a very straightforward process, here’s how to do it:

Step 1: Check Voltage

The first thing you are going to do is make sure that the LED lights have the right voltage. You may have noticed that most of the boom lights in the market are 12V which is not sufficient for this machine. The boom lights have to be 24V and preferably low profile. This is because the machine comes with a rollover protection system (ROPS) that can block the light. A tall boom light will also not fit properly because of the ROPS.

HD Mechanic checking for power on cab lights
Step 2: Check For Power

Head over to the cab to test whether the cables have power. Always be cautious when working around electricity and wear the right safety gear to keep you safe.

You will first need to put the lights on before using your multimeter to check the voltage. Check that all connectors have power at the plug-in. Your multimeter should at the very least read 25V for each connector. If they all have voltage, then you don’t have to check for power in the fuses. You can straight away start mounting the brackets to install the boom lights.

A red arrow pointing mounting hole creating with a drill
Step 3: Create The Brackets

There are two options here; to custom make your own brackets or order brackets from manufacturers. You will need time for the latter as it will probably take a week or two before your shipment arrives.

Creating brackets is both cost-effective and time-saving. You can easily make brackets out of an adapter plate. You will just need to modify it a little bit by bending and twisting it around and then drilling holes big enough for the bolts to pass through.

When creating your own modified brackets, first establish the point of placement for both lights. You want to make sure that the lights fit right inside the square of the ROPs so that the light shines through the screen.

Once you figure out how the lights will be placed, keep bending and twisting to get the perfect angle. Strive to achieve a 90-degree bend. This will sit flat on the placement point. 

Drill two mounting holes on the brackets big enough so that the bolts can fit in properly. One hole will mount to the cab and the other will mount to the lights.

#Tip – When mounting, ensure that the bracket sits closer to the cab so that it doesn’t vibrate so much when the cab is moving. And also that the lights are very close to the center of the square bars that are on the front windscreen. 

 When you choose to DIY brackets, be prepared to make changes on the fly till they fit perfectly.

Red arrow pointing to mounting brackets where HD mechanic test fitting the lights
Step 4: Test Fitting The Lights

Once the brackets are mounted to the cab, it’s time to test-fit the lights to see how best to position them so that they have an excellent aim.

Mount them upright first. If they seem high, there is a good chance they will keep hitting the bar. Unscrew and mount them upside down.

Keep retwisting and re-bending until it looks perfect but be careful not to damage the bracket.

Wiring The Cabin Lights

With the lights physically installed, it’s time to do the wiring.

Poke A Hole Through The Grommets

Take the grommets that were there before, and make a little hole right down the middle so that the wire goes through. The grommets will keep the wires secure as well as prevent water from leaking into the wires.

You’ll notice that you have a lot of wires coming from the power source. That’s okay. However, you won’t be using them all. Only take the one you want to use and let the rest sit inside the cab behind the grommet.

Take the wire from the light as well and push it through the hole you poked on the grommet.

HD mechanic connecting light power cables
Connect The Wires

Cut out the connector from the power wires and cut the light wires to a sizeable length as well.

Use the red sealed butt connectors to join the wires from the light to the wires from the cab, as shown below.

HD mechanic inserting cable to a butt connector

The red butt connectors actually have glue inside (internal sealant) so when you heat them up they actually seal themselves. The reason you must use sealed butt connectors and not the normal ones is that the sealed ones prevent moisture from getting to the wires and causing a short out due to corrosion.

Give them a little tug just to make sure they’re securely connected and that they won’t pull out.

Test The Lights

Test the light to make sure that it’s working okay before you proceed. If it’s not, you’d need to check the connection and probably redo it. If it is working then you can proceed to the next step.

Heat Shrink The Connectors

Take the butane torch and heat the connectors starting from the middle as you work your way out. You can switch to a higher setting if it’s taking longer to shrink. 

Move the connector around a bit as you heat it. As the sealant melts, oxygen also gets out of the connector. This will help in preventing corrosion during winter or when the weather is humid.

Heat it till it’s all shrunk and completely sealed. The sealed connectors should be clear as well, so that you can see through to the wires. There shouldn’t be any movement of wires if you try to pull it out. If you want to really protect your wiring, you can construct a cable harness to wrap them in.

Finish up the wiring by fixing the grommets back, then move over to the other side and repeat the same steps:

  • First, slip the grommet through
  • Strip the wires that supply the power to the lights, and twist the ends to slip in a butt
  • Connector for each wire
  • Crimp the connector, check to make sure it’s snug, then connect to LED light wires
  • Match positive to positive and negative to negative
  • Finally, heat shrink to seal the connectors and fix the grommet back to seal the hole where the power wires are

Your cab lights are now installed and properly sealed for the weather.

How to Replace Boom Arm Lights

Replacing boom lights follows pretty much the same steps as replacing cabin lights. 

You start by checking for power and then doing a test fit of the light to come up with a plan on how to install the boom arm lights. Having a plan in place helps minimize mistakes.

As you try to find the best way to mount the light for excellent aiming, you may discover some problems along the way that you’d need to solve creatively. For instance, the washers may be too small for the hole that they pass right through, forcing you to use extra-large washers.

Once you find the right position to install, connect the wire from the power source to the wire on the lights. You may find that the light wires have terminals, which is often the case because most dealers use terminals. In this case, you either chop off the terminals and use a sealed butt connector to join the wires or simply get a Deutsch type connector to adjoin the terminals.

If using the latter option, cut off the terminals and use blue butt connectors to join the wires because the wires are a bit thicker. Slide in the heat shrinks and test the lights to see if they are working.

If they are working, take your torch and heat shrink just as we did earlier with the cabin lights until the connectors are completely sealed. Start applying heat from the center as you work your way out so that the goop can slide out and seal.

Once done, tie all the cables and wait for when it’s dark to see what angle the light is aiming. You may need to make a few adjustments to get a perfect aim.

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