RC Truck and Construction  

Go Back   RC Truck and Construction > RC Truck's Ag and Industrial Equipment and Buildings > Construction Equipment

Construction Equipment If it digs, pushes, hauls dirt "off road" post it here.


Reply
 
Thread Tools Display Modes
  #21  
Old 06-17-2015, 08:05 PM
mcCracken15 mcCracken15 is offline
Newbie
 
Join Date: May 2014
Location: Roseburg Oregon
Posts: 108
mcCracken15 is on a distinguished road
Default Re: Cat 374 Excavator build

Just a detroit diesel. sorry
Reply With Quote
  #22  
Old 06-20-2015, 01:57 AM
supraman supraman is offline
Newbie
 
Join Date: Jun 2015
Posts: 16
supraman is on a distinguished road
Default Re: Cat 374 Excavator build

Got the bucket done .. It was a day of distractions so i made a whoopsy on one of the teeth and another on the back of the bucket - oh well The teeth are mild steel and i still have a few burs that i missed
I have played with the pump , but was only getting about .5 lt per minute ,So too slow without changing motor combos to find the magic number , i was running 2500 rpm to the pump. Although i found that old PC650 thread and noticed he used an industrial pump . It turns out i can get a 1.6cc pump for between 150 - 300 Aus , A 250 kv motor for $100 Aus .So i looked some more and found a 3 spool valve with 1/4 fittings that i could easily mode to take servos instead of the levers , just like the guy with the PC650 - he is a member here , but i can not remember his name . So it looks like i will give up on the home made pump and buy industrial as i have the room . More on that next week .




Reply With Quote
  #23  
Old 06-28-2015, 02:22 AM
supraman supraman is offline
Newbie
 
Join Date: Jun 2015
Posts: 16
supraman is on a distinguished road
Default Re: Cat 374 Excavator build

Going overseas for a few weeks , so i thought i should paint the cyls , to avoid rusting , and i could not help myself and did the boom also . Will continue with the hydraulics when i return .

Reply With Quote
  #24  
Old 06-18-2016, 04:18 AM
supraman supraman is offline
Newbie
 
Join Date: Jun 2015
Posts: 16
supraman is on a distinguished road
Default Re: Cat 374 Excavator build

Wow,, has it been a year ? Oh well
I found some time lately and finally made a new center plate to push the track frames out 50mm wider . Also modified my original center bearing setup as i had too much slop -relying on the deep groove bearings ,,but all sorted now .
Did some wiring today and checked the slip ring was doing the right thing and not getting hot -- purchased off ebay -- 12v 30 amp 6 wires .
Soon i will get the 3 spool valve and then i can move forward again as until that goes in with servos , i can not permanently fix any thing internally until it is all in there .
Yes my hobby room is messy


Also a test vid of electrics working -- Not the smoothest , but i was using a 3 channel receiver and had the controls set up in a strange configuration to avoid removing an 8 channel for the moment

https://youtu.be/tUrzRvzne3I


Reply With Quote
  #25  
Old 06-18-2016, 05:23 AM
Doggy's Avatar
Doggy Doggy is offline
Newbie
 
Join Date: Oct 2015
Location: Croatia
Posts: 125
Doggy is on a distinguished road
Default Re: Cat 374 Excavator build

Great build!
Did you test the pump from the last photo? A was just looking at pumps like that few days ago, used pump go for really cheap.
Reply With Quote
  #26  
Old 06-18-2016, 08:19 AM
supraman supraman is offline
Newbie
 
Join Date: Jun 2015
Posts: 16
supraman is on a distinguished road
Default Re: Cat 374 Excavator build

No i haven't tested the pump yet .. 1.6 cc pump delivered was around $160 and motor $100 from memory . I had an old speed controller so i will be using throttle mixing on each hydraulic channel - to maintain a constant speed whether one or all 4 cyls are used -- thats the theory anyway
Hoping to get the valve this month if time at work permits.
Cyl volume is about 200ml for all 4 . So if i want to fully extend all 4 in about 5-7 seconds .. Lets say 6 seconds at 200ml means around 2 liters per minute needed = around 1500 rpm at the pump max to give 2.4 liters . Using a 3:1 reduction belt and 12 v at the brushless motor with 560 kv means 6720 divided by 3 =2240 peak pump rpm So really only need 3/4 of the rpm available - wow that was more confusing than what i had in my brain
Reply With Quote
  #27  
Old 06-18-2016, 03:03 PM
liftmys10 liftmys10 is offline
Apprentice
 
Join Date: Sep 2012
Location: Los Angeles, CA
Posts: 473
liftmys10 is on a distinguished road
Default Re: Cat 374 Excavator build

Looks awesome!! Great job!
Reply With Quote
  #28  
Old 10-22-2016, 10:44 PM
supraman supraman is offline
Newbie
 
Join Date: Jun 2015
Posts: 16
supraman is on a distinguished road
Default Re: Cat 374 Excavator build

Since work slowed down this month i decided to continue with the build . Since time costs me nothing i bit the bullet and had a go at making my own valve . I was also worried that a 3 spool industrial valve would take up too much room .
I was also worried that the hydraulic pressure in the rotary valves would push them into the hsg and create too much friction on the back face , so i fitted thrust bearing behind them. Realizing i needed to also seal the stem of the rotary valves i could not be bothered putting a groove in the hsg so i just put a keeper plate on the back with a counterbore to hold the Oring . Next thing is to make a pressure releif valve and the tank ,then test time .





Reply With Quote
  #29  
Old 10-27-2016, 10:00 PM
550166681 550166681 is offline
Newbie
 
Join Date: Sep 2016
Posts: 38
550166681 is on a distinguished road
Default Re: Cat 374 Excavator build

You look beautiful the hydraulic valve
Reply With Quote
  #30  
Old 10-29-2016, 03:00 AM
RCKiwi RCKiwi is offline
Newbie
 
Join Date: Jan 2012
Location: Dunedin, NZ
Posts: 95
RCKiwi is on a distinguished road
Default Re: Cat 374 Excavator build

Nice use of the thrust bearing in the valve. I was planning to use a shim of Telfon behind the head, but you've given me food for thought here. Perhaps energise a circuit with out a servo connected and rotate buy hand to give an indication of the effort required with the bearing?
Nice work
Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 08:36 AM.


Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.