How do I figure out what parts I need for my Clark forklift mast?
Clark has been manufacturing forklifts for years. They’ve been doing it for so long that many consider Clark to be the first mass produced forklift in the United States.
If you’re working on a Clark forklift and you need to order parts for the mast of the forklift, it’s not as simple as looking for the model and serial number and getting us that info. Clark makes it a little more difficult and the reason why has to do with forklift history.
You see, back in the old days, forklift masts could be easily swapped between various models. Let’s say you were a dealer and had a new forklift in stock with a mast that only goes up 12 feet with a diesel engine. You also have a forklift in stock with a gasoline engine that goes up 20 feet. In the old days, the masts could be interchanged between models and you could sell what your customer needed based on what you had in stock.
Flash forward to today, and no one really exchanges masts between forklifts any longer. It can be done but it rarely is done. Dealers have large inventories, models of forklifts have some design differences that eliminate even the option of swapping forklift masts, and labor costs are high to swap the masts.
Where does that leave us today? That leaves us with a Clark parts system which essentially considers the mast a separate piece of equipment with a separate model and parts manual. Clark even calls it something different than the rest of the industry….they call the mast the “deck”. So if you’re working on a Clark forklift mast and you’re looking for parts, you will need to know the DECK number.
WHERE TO FIND THE DECK NUMBER
Clark stamps each mast with a unique number. That number can be found on the outer mast channel, on the driver’s side of the forklift. It will typically be a 4 digit number with some letters.
If you look closely at the pictures above, you’ll see the deck (mast) number circled. That’s the deck number and that’s what we’ll need to properly identify the parts on your forklift mast.
Clark forklift brake systems are fairly straight forward to work on. Some have wet brakes, others utilize traditional brake shoe brake set ups. This tutorial will show you how to replace brakes on a Clark forklift with brake shoes.
Forklift brake systems typically use a master cylinder often mounted beneath the operator floor panel. Remove the floor panels, find the master cylinder and go to work. This tutorial will show the replacement of a master cylinder on a Hyster 5000 pound forklift.
One of the most common forklift complaints from forklift operators is a noticeable propane gas smell around the forklift. Frequently forklift operators will call service companies complaining that their forklift has a leak. Often the problem is not with the forklift but with the propane tank.
This tutorial will show how to replace 2 o-rings on the propane tank and eliminate one of the most common complaints from forklift operators.
The model J regulator is the most popular LPG regulator on the market today, yet it is no longer used in current models of forklifts due to emissions regulations.
Impco model J regulators are found in a most brands of forklifts along with other LPG powered equipment like Tennant or American Lincoln scrubber units and even Zamboni ice resurfacers.
Inside the model J are diaphragms made of hydrin or silicone. These wear out or tear and need to be replaced. The first decision you’ll have to make is if you want to replace the entire model J unit or rebuild the unit with a repair kit. Either decision is fine, it just depends on how you value your time.
You will see in the tutorial below that rebuilding a model J is pretty simple. There are times when a model J might be mounted inside a forklift where it’s easier to rebuild the unit instead replacing the entire unit. It just depends on the location of the model J.
One more note. Model J is Impco’s designation for an entire series of LPG regulators. There’s a method to how the Impco part numbers work:
Model JB = Model J with Blue spring. Blue spring units have Neg. 0.37 kPa pressure. This is the standard and most common model J.
Model JO = Model J with Orange spring. Orange spring units have Neg. 0.12 kPa pressure. This is the lease common model J. You should stick with the model J that is already installed in your forklift.
After the letters JB or JO, you sometimes see a -2 like this: JB-2. The -2 indicates the diaphragms are manufactured from silicone. No letter means the diaphragms are made from black hydrin rubber. Silicone (yellow) diaphragm material is the optional upgrade material that provides excellent flexibility in cold weather climates and is more resistant to chemical contamination. They can be used interchangeably, if you want to upgrade, go with the silicone material.
Remove screws from front of unit. The screws are typically 9-32 x 7/8″ Torx style
Remove diaphragm from inside cover
Remove lever. Screw is also a Torx screw
Remove the screws from the back of the model J unit.
Take the halves apart and remove the old diaphragm.