What is my Wheel PCD

What is my Wheel PCD

“I have no idea what PCD is nor do I know how to calculate it?”….is an answer we hear frequently from customers. Technically, Pitch Circle Diameter (PCD) is the diameter of the circle which passes through the centre of the wheel studs, wheel bolts or wheel rim holes.

Caravan Wheel Nut Indicators

Caravan Wheel Nut Indicators

Caravan wheel nut indicators help identify loose wheel nuts caused by rough dirt roads. Broken wheel studs are regularity occurrence on open highways around Australia.

How to measure Rim and Tyre Backspace

How to measure Rim and Tyre Backspace

Wheel backspace is an essential measurement for the manufacture of axle length. The first thing you need to do when building a new trailer is to buy your rims and types.

Alternatively, you could purchase your rims and tyres from us and we’ll do the calculation for you. One more complication, we need to know your chassis width.

Loose Axle U-bolts cause Highway Havoc

Loose Axle U-bolts cause Highway Havoc

Loose axle U-bolts causes highway havoc for unsuspecting caravaners. The reality of not checking your rig before heading on your family holiday can easily become a nightmare.

Today’s article has been generated from yet another unsuspecting driver who forgot to re-tighten u-bolts after the first 300 kilometres from new.

Stretching U-Bolts cause Caravanning Problems

Stretching U-Bolts cause Caravanning Problems

Caravanning problems caused by stretching u-bolts can usually be easily fixed, however, unforeseen issues can have disastrous consequences. An example is the humble u bolt that clamps the spring to the axle. The bond between the spring and the axle prevents catastrophic events at high speed.

Galvanised ElectroGal® Trailer Parts

Galvanised ElectroGal® Trailer Parts

Galvanised trailer and caravan parts have undergone a quiet revolution. Gone are the hot-dipped galvanising methods that were used in many processes. Hot-dipped galvanising whilst still very popular is being replaced by ElectroGal® or a Mechanical Galvanising process.

How to Auto Calculate Truck D-Value

How to Auto Calculate Truck D-Value

Calculate D-Value for Towing Equipment on the Truck | Trailer. D-Value is one of the most understood calculations in the truck and trailer industry. We will try and make it easy with a little technology and science.

Easy Steps to Install a Marine Bearing Seal Correctly

Grease is applied to seals and bearings for one reason only, to reduce friction. Friction produces heat, excess heat through incorrect installation destroys bearings. Is it true that 40% of all bearings do not live their full engineering life due to bad installation practices?

How to Align Caravan Wheels

How to Align Caravan Wheels

If the tandem wheels are not square, call your service agent for an alignment. It is quite likely that your u bolts have come loose and your rig has sustained some shock loading during your travels, This moves axles backwards and out of alignment.

Electronic Control Units (ECU) and Towing Looms

Electronic Control Units (ECU) and Towing Looms

Last updated on October 5th, 2019 at 05:42 pmWhy do I need an Electronic Control Unit (ECU) on my towbar? It would be true to say, being an Electrician, I can wire almost anything. Then along came the computer in motor vehicles. Computers are energy management systems. Computers monitor and control most of the energy associated […]

Truck Trailer Pintle Coupling Scales

Truck Trailer Pintle Coupling Scales

If you are heavy on the scales, shift weight from the front of the axle set to a more central location. This action will lower the weight on your tow ball, allowing your vehicle to become lighter and therefore brake more effectively.

Why does my Caravan not stop quickly when braking?

Why does my Caravan not stop quickly when braking?

Do your car brakes effectively stop your caravan? Back in the day when dad towing our caravan with his Holden, hitch-ups were something dada did and knew about. Truth is, he knew where the fuel when in the car and the coupling had to be attached to the tow ball to haul the caravan.

Bearing Buddy fallen off or stolen?

Bearing Buddy fallen off or stolen?

Bearing Buddy is a machine fit as opposed to a compression fit. Machine fit sizes are not as flexible as compression fits. Unless you are aware of precautions that need to be taken, you may lose your bearing buddy on the first bump in the road.

Video: How can I stop Caravan Sway

Video: How can I stop Caravan Sway

Last updated on October 31st, 2019 at 01:04 pmHow can I stop Caravan Sway is a great question. Learn why we recommend tow ball weights should be 5% to 7% on a tandem trailer and 7% to 10% on a single axle trailer. The key to significantly reducing caravan sway is knowing the weight on […]

How to avoid a Towing Disaster

Towing your caravan is not as simple as you would think. Whilst enlarging your existing receiver bar from 22mm to 32mm might not seem a big deal, it will quickly become obvious a this is not a solution for towing your $80,000 rig.

How to fix Dangerous Caravan Vibration Fatigue

How to fix Dangerous Caravan Vibration Fatigue

If Vibration Fatigue can bring down a Boeing 747, you can be sure it will bring down your Caravan too. Boeing has taken precautions against vibration fatigue and so should you. Consider the following article, there may be a few precautions you can take or at least check.

Why dirt roads destroy Electric Brakes

Why dirt roads destroy Electric Brakes

Learn how dirt roads destroy Electric Brakes. Unsuspecting caravan owners discover their electric braking systems and electric drums are being rendered defective by vibrations transferred to braking systems by corrugated roads.

Can Caravan Overlay Axles be inverted?

Last updated on November 23rd, 2019 at 10:37 amDo you agree caravan overlay axles can be inverted? Bill asked me a great question on the Couplemate website yesterday. He asked “I want to invert my overlay axle, so my caravan gains extra height. Currently, it hits the top of the mudguard.” So Bill here is our […]

Wrong hanger location cause Spring Problems

Wrong hanger location cause Spring Problems

First of all, go out and measure your hanger measurement and then measure your spring width eye to eye. If your brackets are the same length as you spring measurement then there is only ONE FIX. Are your springs squeaking as you travel down the highway?
This common problem has an easy fix that will surprise you.

D -Value for Pintle Hooks

D -Value for Pintle Hooks is critical when selecting the correct pintle hook because depending on your truck and trailer weight, the D-Value is changing.

Dee Shackle Tips to Select the Correct Size

Dee Shackle Tips to Select the Correct Size

Dee Shackle rating is often too high for your caravan. Learn how to calculate the correct dee shackle size? Your Dee Shackle must be of a comparable size to your safety chain. The only way you can prove comparability is with a rated shackle or a stamped dee shackle.

How to raise a Trailer Suspension

How to raise a Trailer Suspension

A strange, occasional noise was a tyre hitting the top of the wheel arch when a pothole jumped up and smacked it. Creating more ground clearance works a treat, or did I open up a can of worms instead of fixing the problem?

How to Clean your Caravan Air Conditioner

How to Clean your Caravan Air Conditioner

How to EASILY reinvigorate your Caravan Air Conditioner to near NEW. Secrets on how to Clean your Caravan Air Conditioner effectively. Easy remedy shocks caravanners with simplicity. Listen carefully and share.

If your caravan is too hot, a few simple procedures will return your caravan to like new.

Mag Wheel Nuts and Lug Nuts

Mag Wheel Nuts and Lug Nuts

Last updated on October 27th, 2019 at 09:09 am Mag Wheel Nuts and Lug Nuts Mag Wheel Nuts and Lug Nuts are just a fancy accessory I do not need. Well, the word RUST may change your mind. Your nuts will lock onto your stud when your studs become rusty. So your rust wheel studs […]

Why Caravan Bearings and Boat Bearing fail

Why Caravan Bearings and Boat Bearing fail

Caravan and trailer bearings can be a contentious issue especially when they fail. Seeing a wheel off a caravan on my way home on Australia has triggered this article. I would appreciate it if you could share this with your mates as many folks forget to do bearing checks. Failed bearings can also cause a wheel to come off and roll into incoming traffic with really nasty outcomes.

Dee Shackles and Safety Chains

Dee Shackles and Safety Chains

Drawbar safety chain attachments should not come into contact with the road surface when the trailer is disconnected. – VSB1. Safety chains must be stamped at least every 4 links.

How long do Caravan Shock Absorbers last

How long do Caravan Shock Absorbers last

Last updated on November 3rd, 2019 at 06:24 pmHow long do caravan shock absorbers last is a great question that we get asked a lot. If I said 5000klms you would say I am stupid and had no idea. So first read a little about shock absorbers and how they keep your caravan on the […]

Video: Vibration Fatigue in Caravans and Boat Trailers

Video: Vibration Fatigue in Caravans and Boat Trailers

Vibration fatigue in caravans and boat trailers is one of the leading causes of spring failure, axle failure and failures associated with your running gear. Have you ever seen an axle wobble in the middle as its owner drives down the highway oblivious to what is occurring under his rig?

Online Lower Freight and Postage Costs

Last updated on October 5th, 2019 at 01:25 pmOnline Lower Freight and Postage Costs Recently Couplemate brought online lower freight and postage costs to its customers. We know that every dollar we save you is a dollar that can be spent elsewhere. These online lower freight and postage costs have now been passed onto you […]

Caravan Spring Choices

Caravan Spring Choices

The right trailer spring choice helps prevents holiday accidents. I hope this helps you when making your trailer spring choices. Yes, these matters are serious and you will need professional help unless you happen to be an engineer or a tradesperson who understand a little basic engineering.

Express Australia Post / Qantas Caravan Parts

Express Australia Post / Qantas Caravan Parts

The professionals at Couplemate Trailer Parts manufacture axles, electric brakes, electric braked drop axles, independent suspension, pintle towing equipment and more…

Call Bruce, Mike or Chris 07 33483822. we will do our very best to get your caravan or trailer parts to you on the fastest carrier possible,

Caravan Shock Absorbers

Caravan Shock Absorbers

Early last century, Henry Ford thought shock absorbers were essential equipment on his cars. Henry said, “the driver and passengers are the shock absorbers”.

Axle Steel for Caravan and Trailer Axles

Axle Steel for Caravan and Trailer Axles

Buying Australian axles from Couplemate means you are providing jobs for Australians! For no other reason is it appropriate to argue the point of Australian or Chinese steel. Buying Australian Axles provides jobs for Australian’s.

Pintle Hooks and Certified Testing

Pintle Hooks and Certified Testing

When shopping for Pintle Hitches and other towing equipment, some cheap product has no testing, may explain why it is cheap. SAE is not an accepted standard of testing by DOT Canberra and will likely be rejected by vehicle inspectors.

Electric Brakes made Simple in 2019

Electric Brakes made Simple in 2019

“I do not think I really need electric brakes on my camper as it is pretty light.” is a comment I get all the time. This one scared me enough to put disc rotors and brakes on my boat trailer. I should have known better, and I should have done it years before, but I didn’t. How electric brakes work. Allow the experts at Couplemate solve your braking problems. Simple solutions to increase braking power.

Caravan and Camper Upgrade Tips

Caravan and Camper Upgrade Tips

Most caravan and campers are upgraded because existing 39mm Round Axles and 40mm Square Axles are underperforming. Talk to our experts on how to tune your suspension for maximum loadings.