Crown 45RRTT:
Hydraulic FLuid Level

We have this "wonderful" unit. It's a die hard but we have no information on it what soever and no one around wants to touch it.

How do you check the hydraulic fluid level AND what kind of fluid is to be used in this machine?
  • Posted 13 Feb 2015 04:48
  • Discussion started by Joshman
  • British Columbia, Canada
Thanks for your help!
Showing items 1 - 8 of 8 results.
Those slaves under the flood plate are pretty dry on the outside. Nothing in the boot.

I took the dash off and found one of the larger hydraulic hoses' outer jacket is cracking and I can see the lighter color inner jacket and it's a bit moist there. I believe that may be the leak. I'll have to watch it.

The fluid on the floor is the color of the hydraulic fluid (clear/yellow), not the DOT5 (purple) in the reservoir but I have a sneaky suspicion someone put AW46 fluid in the brake system. None the less, I flushed & bled the brake system with DOT5 twice now and will do it again at the end of the week. I will see if any purple leaks show up.

I took the inside right side panel off and and found the controller and a loose wire but I am unsure where it goes. I'll post that in a new thread later on.
  • Posted 17 Feb 2015 07:33
  • Reply by Joshman
  • British Columbia, Canada
that does sound like the brake fluid reservoir to me.
Pull the floor plate out and take a look at the slave cylinders, pull the rubber boot back and see if there is any fluid inside them or if any runs out. If they have been leaking you will probably see evidence of that around them.
Also if there is a slave cylinder on the brake if it has mechanical brake assembly check that one also, pull the rubber boot back and see if there is any evidence of fluid.

Any cylinder that appears to be leaking replace it.
when you refill and bleed the system
use DOT 5 fluid only
  • Posted 17 Feb 2015 03:54
  • Modified 17 Feb 2015 04:08 by poster
  • Reply by swoop223
  • North Carolina, United States
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I'm not too sure.

There is a small aluminum(?) header tank sitting up near the top of all of the mechanical stuff with a red threaded square on the lid.

That tank is right empty and we are not able to engage the drive on the machine.

I assume since there is no fluid in there at all, that is where the leak is from.

Can I put the same hydraulic oil in there as in the main tank or is this strictly DOT5 brake fluid?

Thanks again!
  • Posted 17 Feb 2015 03:28
  • Reply by Joshman
  • British Columbia, Canada
yes once i reread his response popeye is correct
so i guess we need clarification
is this a brake fluid leak in the line from the resivoir to the slave cylinders under the floor plate? Or is this a hydraulic leak from the main supply line from the control valve to the main cylinder up front that runs down under the machine?
  • Posted 15 Feb 2015 01:53
  • Reply by swoop223
  • North Carolina, United States
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in your answere you made it sound like you have a brake fluid leak to the master cylinders. brake fluid would be DOT#5
  • Posted 14 Feb 2015 22:07
  • Reply by popeye
  • Ohio, United States
i think you will find if you remove the battery you will have better access.
Reach trucks are not easy to work on sometimes in cases like this but you shouldn't have to lift the truck off the ground to remove that line.
  • Posted 13 Feb 2015 11:34
  • Reply by swoop223
  • North Carolina, United States
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Thank you!

It turns out we have a pinhole leak in the main line somewhere between the header tank and the two slaves under the feet (likely where the hose disappears under the machine. I need a forklift to lift this forklift :)

For now, clean up every day. Thanks again!

Do you know if there is a way to remove that main line without lifting the machine?
  • Posted 13 Feb 2015 07:45
  • Reply by Joshman
  • British Columbia, Canada
There is a breather cap on the tank.
this is where you put oil in and also where you check the level, there will be a basket type screen inside there, the level should be right up to the bottom of the screen.
as for the type of oil ?
AW32 should be ok unless it is cold storage type system... then it would be AW46 or 68 depending on the temp it is working in.
  • Posted 13 Feb 2015 05:13
  • Reply by swoop223
  • North Carolina, United States
You've been swooped!
swoop223@gmail.com

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