Electric Over Hydraulic Brakes, Leaf Springs, Bearings, Hardware, & Brake Lines for Dexter 7K Axles

Question

Question:

I have purchased one set k2hr712d kit for my 7000 lbs dexter axle to convert to disc brakes to check fit appears right kit for this axle. I was thinking of converting to oil bath, I have Dexter EZ lube axle system, which system is better for marine trailer use ?? It appears Kodiak xl pro kit for 5200/6000 xlpolube2440 is the hit for this hub? My inner seal diameter at axle is 2 1/4inch inch ouside is hub for k2hr712d kit ? If I stay with grease appears rg06-070 is the correct seal ? Springs SP198275 appear to be the correct spring by measurement ? note made in china are they a good quality spring? U bolts APUbr-8 Equalizer bolt 126a1 and equalizer treq45 match my trailer Eq specs Inner Bearing 14125a Outer bearing 25580 Considering Hydrastar HS381-9067 kit for elec. over Hyd? Brake lines need advise ? Studs for brake disc brackets need advise ? Cotter key need advise? Shackles are same dementions as SL-275 is the a replacement kit for this size with grease fittings?

asked by: John A

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Expert Reply:

Since the ProLube kit # XLPROLUBE2440KIT is only rated for use on 5,200 to 6,000 pound axles I do not recommend using it for 7,000 pound axles. Grease would be better for marine applications since a hub full of grease repels water and an oil bath hub could just let the water set on top.

The correct grease seal for disc brake kit # K2HR712D is # RG06-070. It does have an inner diameter of 2.25 inches and the outer diameter at 3.376 inches will fit the hub in the disc brake kit.

Spring # SP198275 is rated for use on 7K axles and if the measurements match up to what you need then this spring is the way to go. So it appears you have selected the right spring for the trailer. The springs work well. There isn't a whole lot that can be messed up in the manufacturing process of leaf springs and we haven't had complaints about this brand of spring so I am confident they will work well for you.

U-bolt kit # APUBR-8 does fit up to 7K axles that have a 3 inch diameter. The length is 7 inches so this is the appropriate kit provided the axles are round with a 3 inch diameter.

The wet equalizer bolt # 126A1 does work with equalizer # TREQ458 so no worries there.

There is a bearing kit, # BK3-200, that has both bearings and the appropriate seal. The bearings and seal in the kit are what the brake system requires. It also comes with a cotter pin and some backup races (the hubs come with races already installed).

A lot of people swear by electric over hydraulic brakes and some say they will never use anything else so it is a great set up. The HydraStar system # HS381-9067 was designed for marine applications and it is one of the better and more popular actuator options. There are some HydraStar brake line kits as well. For a single axle use # HS496-151, for tandem axles you could use # HS496-252, and for triple axles use # HS496-253. These kits come with everything you will need.

The brake kit comes with the bolts to mount the calipers to the brackets but not the hardware to mount the brackets to the brake mounting flanges. If you have brakes now then you can reuse the same hardware used to hold on the old brakes. Otherwise you can use bolt # 7-5, nut # 38N, and lockwasher # 38LW. All of these parts are sold in quantities of 1.

If your don't want to reuse your existing shackle straps and # TRSL275 is the right size you can certainly use them. If you wanted to use wet bolts instead of a regular bolt to hold the springs to the shackles, hangers, and equalizer then use # 126B2.

I feel like we just built a trailer! If you have any other question about all this information I'll be happy to help.

expert reply by: Michael H

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Answer 1

Dexter does offer 8k axles but at this time we do not offer any. We do however have 8,000 lb axle disc brake kits from Kodiak that you could use like the part #K2HR89DD. Then for an actuator kit the HydraStar actuators are the best around. For a kit…

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Answer 2

We prefer the Hydrastar Actuator part #HBA16 as it is the most reliable and works the best. This would be the best option for your trailer. We have the least amount of issues with this actuator and it is the one our installers like the most so we…

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Answer 3

According to Titan, if only the white and black wires are connected, the hydraulic pump should not run. With those two wires attached, the pump should start when the blue wire is touched to the positive battery terminal. The folks at Titan tell me…

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Answer 4

I believe you are referring to the additional 3-terminal plug coming from the 7-Way harness included with the Titan BrakeRite I Plug and Play EOH Actuator Kit #T4813102. This will connect directly to the corresponding plug coming from the actuator…

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Answer 5

We do have both individual disc brake components and kits for converting a trailer to this type of braking operation. A great resource you can check out is the linked article (one each for hydraulic discs and one for electric-over-hydraulic discs)…

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Answer 6

National seal 472920 has an inner diameter of 2.25 inches and outer diameter of 3.375. For a replacement, you will want Grease Seal - Double Lip #GS-2250DL or oil seal #10-63.

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Answer 7

The disc brake kit #K2HR712D that you referenced should work well for you. You would need a quantity of 2 of these for each of your axles. These have the same bolt pattern as your current setup and are rated a 7k. You can verify that these will fit…

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Answer 8

Since you have a Lippert 7k axle the correct bearing kit is either part #BK3-200 or the part #BK3-210. The difference would be the size of the inner diameter of the grease seal. The part #BK3-200 comes with seal that has inner diameter of 2.25 inches…

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Answer 9

From what I could find online it looks like the Lippert 8K axles use inner bearing #25580, outer bearing #02475, and a grease seal that has an inner diameter of 2.250". If you are using a Kodiak disc brake kit like part #K2HR712D for 7K axles…

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Answer 10

Bearing Buddy pumps grease into the center of the hub all the way back to the grease seal. A double lip seal should be used to prevent grease from blowing out the seal when added. When the hub and seals and bearings are first assembled, they should…

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Answer 11

In order to determine the torque rating for the lug nuts on your trailer you will need to know check out the chart I attached that shows all of the torque specs for all the trailer lugs available based on stud size, wheel material and wheel size.

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Answer 12

Hey Richard, thanks for reaching out! The Dexter DX7.5 Drop-N-Go Brake Actuator #099-175-00 is a great option for a replacement actuator because it's a direct replacement for the common Model 60 actuators that were popular in the '90s.…

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