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Topic: Replacing trailer leaf springs.  (Read 1876 times)

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Offline dugong

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Replacing trailer leaf springs.
« on: July 19, 2016, 08:44:48 am »
So my springs lasted 3 years, on the way back from Jozini they were really flattened out and one blade had broken.
Time for some trailer maintenance - new springs with corrosion proofing and some  tlc the for rusted axle!!
Just Fish!!!

Offline dugong

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Re: Replacing trailer leaf springs.
« Reply #1 on: July 19, 2016, 08:58:27 am »
Stuff needed:
8 blade leaf springs (800kg)  R1000 for two including mounting plates and u-bolts (Burquip)
Three rolls of 50mm Denso tape. R200
Surgical gloves :rck"
Marine grease
Corrosion Block
Rustoleum spray paint.
NS1 Rustbuster (converter)
NS4 Anti rust coating
4x jack stands
Trolley jack :rck"


« Last Edit: July 19, 2016, 10:19:25 am by dugongboy »
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Offline dugong

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Re: Replacing trailer leaf springs.
« Reply #2 on: July 19, 2016, 09:06:40 am »
Jack up the trailer - place on jack stands - remove wheels - drop whole axle by undoing the shackle bolts and lowering with the trolley jack - slide out - remove old fudackered springs.
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Offline dugong

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Re: Replacing trailer leaf springs.
« Reply #3 on: July 19, 2016, 09:14:16 am »
Chip scale rust and clean up with wire brush (no need to go to bare steel)
Apply rust converter - it goes a blue/black colour after some time (see left of the axle)
« Last Edit: July 19, 2016, 10:22:16 am by dugongboy »
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Offline dugong

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Re: Replacing trailer leaf springs.
« Reply #4 on: July 19, 2016, 09:19:58 am »
Let the rust converter dry for 4 hrs. then apply two coats of NS4 Anti Rust.
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Offline Prego

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Re: Replacing trailer leaf springs.
« Reply #5 on: July 19, 2016, 09:27:13 am »
Mine has been at LA Axle since our Easter trip to Paindane. New Springs have been put on and new mounting points welded on. Axle has been refurbished and now I'm driving around looking for new piston kits for my caliper  :-(

Offline dugong

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Re: Replacing trailer leaf springs.
« Reply #6 on: July 19, 2016, 09:40:06 am »
Now for the spring packs - spray with two coats(4hrs in between) of Rustoleum , this is R130 a can but is a very good quality enamel paint - lie the springs flat and spray with Corrosion Block (excellent stuff!!) allowing it to penetrate between the leaves.
Don the gloves......this gets messy!! Apply grease liberally - wrap with the Denso tape.
« Last Edit: July 19, 2016, 09:58:18 am by dugongboy »
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Offline dugong

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Re: Replacing trailer leaf springs.
« Reply #7 on: July 19, 2016, 09:51:18 am »
Then wrap the axle and secure with a few cable ties.
Reassemble and the whole lot can be put back on the trailer :rck"
NB: use nylock nuts on the shackles and ubolts - the ubolts need to be checked and retightened after the first short trip.


« Last Edit: July 19, 2016, 10:07:21 am by dugongboy »
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Offline dugong

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Re: Replacing trailer leaf springs.
« Reply #8 on: July 19, 2016, 10:18:19 am »
The whole thing takes a few hours but the drying time for the paint turns it into a few days, the only help I needed was re aligning the axle/springs for the shackle bolts, two things take a lot of pain out of the exercise - a decent trolley jack and surgical gloves (R20 for 10 pairs) Denso Tape is grease impregnated tape that is used to seal pipeline welds and is VERY messy!!!
It would also be a good time to inspect and repack/replace your bearings(R350 at Burquip) as it is very easy to work on the hubs with the axle off.
« Last Edit: July 19, 2016, 10:24:29 am by dugongboy »
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Offline REEFMAN

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Re: Replacing trailer leaf springs.
« Reply #9 on: July 19, 2016, 12:02:03 pm »
 (clap) Great post Dugong!  :+ cred:

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Offline John F

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Re: Replacing trailer leaf springs.
« Reply #10 on: July 19, 2016, 12:05:12 pm »
Agreed (clap)

Reminds me that I need to change the bearings of my trailer

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Offline GT Mayhem

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Re: Replacing trailer leaf springs.
« Reply #11 on: July 20, 2016, 05:27:00 pm »
Thanks for the informative post dugong. Some great ideas here. Sometime ago on my old trailer i used duram rubberising paint to coat my axle. worked a charm

Offline dodger

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Re: Replacing trailer leaf springs.
« Reply #12 on: July 20, 2016, 06:21:33 pm »
some good info there a nice tut  :+ cred:
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Offline Rory mundy

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Re: Replacing trailer leaf springs.
« Reply #13 on: July 20, 2016, 06:29:50 pm »
That will squeeze a few more years out the springs

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Offline jacques.hough

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Re: Replacing trailer leaf springs.
« Reply #14 on: September 18, 2017, 09:11:41 pm »
The whole thing takes a few hours but the drying time for the paint turns it into a few days, the only help I needed was re aligning the axle/springs for the shackle bolts, two things take a lot of pain out of the exercise - a decent trolley jack and surgical gloves (R20 for 10 pairs) Denso Tape is grease impregnated tape that is used to seal pipeline welds and is VERY messy!!!
It would also be a good time to inspect and repack/replace your bearings(R350 at Burquip) as it is very easy to work on the hubs with the axle off.
Hi dugong,
Do you mind giving me the details of the place where you bought the denso tape? I went online and saw denso have a huge anti corrosion department  with a number of different wraps/tapes and I am not sure of the specific product name that you used.

Offline dugong

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Re: Replacing trailer leaf springs.
« Reply #15 on: October 10, 2017, 09:43:45 am »
Denso South Africa
120 Malacca Rd, Red Hill, Durban - 031 569 4319
« Last Edit: October 10, 2017, 09:44:27 am by dugong »
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Offline Ziggy

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Re: Replacing trailer leaf springs.
« Reply #16 on: October 10, 2017, 10:37:17 am »
I looked at Denso - went to that place, no knowledgeable person there

Decided against it because the cost of the tape for two springs  - plus the other grease type paint to be used (as they had suggested)  - would have cost me the same as one new spring (OK, I have a small trailer)

Decided to just make sure that I wash down well and spray with q20 each time - and just change springs every 2-3 years.

Previously I painted with anti-rust coating, primer and painted then covered it in tectyl. However, even a pin prick hole will allow salt water in and then the rust happens from inside. So my springs looked good from outside , but when I cleaned off the tectyl - they were badly rusted. The same thing with DENSO - you wont be able to see the rust developing until it is too late and then you have spring failure. I would rather be able to see the springs and take remedial action

Offline HooknCook

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Re: Replacing trailer leaf springs.
« Reply #17 on: October 10, 2017, 10:57:01 am »
Personally I think Denso Tape is a waste of time and money. If water does get in, then it is trapped in there. I like to use oil and petrol mixed and then sprayed onto everything, let it rest for 2 hrs and re-apply. Once you. Ack from the sea, take a High pressure cleaner and prepsol and then spray it all off and give it a good amount of fresh water. And once dry I re do the oil/petrol mix.

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Re: Replacing trailer leaf springs.
« Reply #18 on: October 10, 2017, 12:05:47 pm »
Personally I think Denso Tape is a waste of time and money. If water does get in, then it is trapped in there. I like to use oil and petrol mixed and then sprayed onto everything, let it rest for 2 hrs and re-apply. Once you. Ack from the sea, take a High pressure cleaner and prepsol and then spray it all off and give it a good amount of fresh water. And once dry I re do the oil/petrol mix.

Eish - too much work if you live at the sea and use your boat to go fishing 1-2 times a week like me - weather permitting. But I agree 100% not using Denso tape

Offline Rory mundy

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Re: Replacing trailer leaf springs.
« Reply #19 on: October 10, 2017, 12:26:09 pm »
i wash mine after every trip and spray with q20 ect still rust to pieces so just change them every few years

vidalbum