Hydro relief pressure testing made simple: Kubota Review  -- Kubota Tractors Discussion Forum and Review Hydro relief pressure testing made simple: Kubota Review -- Kubota Tractors Discussion Forum

  parts   |   manuals   |   discussion   |   photos   |   podcast   |   reviews   |   specs   |   dealers   |   classifieds   |   contact   |   faq   |   myProfile   |   home          Login Now | Sign Up


FAQ:   What is a tractor?

Forum Index

Kubota Tractors
  Kubota News
  Kubota Price
  Kubota Review
John Deere Tractors
  John Deere News
  John Deere Price
  John Deere Review
New Holland Tractors
  New Holland Tractor Price
  New Holland Tractor Revie
Other Tractor Brands
  Articulated Tractors
  Belarus
  Bobcat Tractors
  Case
  Cub Cadet
  Hinomoto
  Kioti Tractor
  Long
  Massey Ferguson
  Mitsubishi
  Other Tractor Brands
  Other Tractor News
  Shibaura
  Yanmar Tractors
Lawn and Garden Tractors
  Craftsman
  Cub Cadet Garden
  John Deere Garden
  Kubota Lawn Garden
  Other Garden Tractors
  Simplicity
  Toro Wheelhorse
  Ventrac Lawn Tractors
Antique Tractors
  Allis Chalmers
  Case David Brown
  Farmall IHC
  Ford
  Ford 9N 2N 8N
  Fordson
  Harry Ferguson
  John Deere Older
  Massey-Harris Ferguson
  Minneapolis Moline
  Oliver Cletrac Cockshutt
  Restoration
  Tractor Pulling
Tractor Attachments Implements 3ph
  Back Hoe
  Field Mowers Brush Cutter
  Grooming Mowers Finish Mo
  Loaders
  Snowblowers / Snow Plows
  Tillers and Ploughs
  Tractor Implements
  Trenchers
  Wood Chippers 3PH
Tractor Maintenance
  Diesel Fuel Lubrication E
  Tractor Engine Repair Reb
  Tractor Tires
Utility ATV
  All Terrain Vehicles
  John Deere Gator
  Mule Utility Vehicles
General Tractor
  Farming Ranching Agricult
  Photo Contest
  Size Tractor Needed
  Tractor Projects
  Tractor Safety
  Welding
Chinese Tractors
  Jinma Farmpro Agracat
  NorTrac Tractors
  Other Chinese Tractors
Cars
  All Brands
  Audi VW
  BMW
  Car Tires and Maintenance
  Chrysler
  Exotic, Sports, Racing
  Ford Cars
  General Motors
  Honda
  Hyundai
  Mercedes
  News
  Nissan
  Subaru
  SUV and Trucks
  Toyota Cars
Trucks Trailers
  Chevy Pickup Trucks
  Dodge Pickup Trucks
  Ford Pickup Trucks
  Toyota Pickup Trucks
  Chevy Pickup Trucks
  Dodge Pickup Trucks
  Ford Pickup Trucks
  Toyota Pickup Trucks
Home Building
  Alternate Electric Energy
  Barns Pole Barns
  Buying Ranch Farm Acreage
  Carpentry
  Contractors
  Electric
  Excavation
  Moldings Finish Trim
  Other Home Building
  Pellet Stoves
  Plumbing
  Wood Stoves
Tools
  Electirc Power Tools
  Gas Power Tools
  Generators
  Shop Tools
  Techniques Howto
Landscape
  Flowers Shrubs Garden
  Golf Course Maintenance
  Irrigation Systems
  Landscape Design
  Landscape Lighting
  Landscape Maintenance
  Lawn, Turf, and Grass
  Vegetable Gardening
Construction
  Caterpillar
  Komatsu
  Wheel Loaders
Current Events Health Happiness
  Current Events
  Dogs and other Pets
  Electronics And Computers
  Food
  Health
  Just For Fun Off Topic
  Movies Music Games
  Personal Finance Investme
  Sports Outdoors
Tractorpoint Site
  Member Photos
  Site Members
  Website Operations Howto


New As Posted | Active Subjects



Click to Post a New Message!

Discussion Boards > Active Subjects > Messages as Posted > Kubota Review Forum

Page [ 1 ] |
Reply | Pop Up Window Reply | Add PhotoAdd Photo
 12-15-2002, 19:39 Post: 46148
jeff r



View my Photos

View my Photos  Pics
Join Date: Jul 2003
Location: burton. michigan
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster
Posts: 428

2
Filter by User
 Hydro relief pressure testing made simple

Hey Guys,

I don't know how many of you guys are diagnostic tool minded, but my Kubota's B-2150's and Wood's 1006 FEL Loader that was dealer installed was acting a little "wimpy" on lift load capacity with the 54 inch bucket loading 10a stone. So I metioned to my brother after driving his Ford 1710 that his FEL seemed to lift more. He said the 1006 is a smaller loader but still should lift the front wheels off the ground very QUICK and EASY, plus a 54 inch bucket of 10A is not too heavy to lift without backing out of the pile. He asked me if I knew what the relief pressure was set at and had I ever checked it? Just being a mechanics helper for fun and Field Engineer in the metallurgy testing field for real, I said, "How and what do you use to check that?" He quickly rigs me up a 3000 pound capacity hydro gauge and hose and tells me to connect it to the loader's lift supply port on the control valve. I did it and found out my pressure was 350 pounds short of 1660 pounds. I reset the relief pressure valve to 1700 and VOILA...It works like a BIG DOG. Moral of the story is: a liquid filled gage and the proper hose and testing your relief pressure is a good and CHEAP tool to have around the shop. In the spring I am going to Check pressure on my backhoe. That gauge set-up is as handy as a hammer loop on your tool belt.






Reply to PostReply | Quote Post Reply to PostQuote Reply | Add PhotoAdd Photo




Bookmarks: Digg It | Del.icio.us |
 12-15-2002, 22:01 Post: 46151
Billy

TP Contributor

View my Photos

View my Photos  Pics
Join Date: Oct 1999
Location: Southeast Oklahoma
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster
Posts: 975
 Hydro relief pressure testing made simple

That's pretty neat Jeff. Thanks for sharing.

Billy






Reply to PostReply | Quote Post Reply to PostQuote Reply | Add PhotoAdd Photo




Bookmarks: Digg It | Del.icio.us |
 12-16-2002, 06:52 Post: 46157
TomG

TP Contributor

Join Date: Feb 2002
Location: Upper Ottawa Valley
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster
Posts: 5406

3
Filter by User
 Hydro relief pressure testing made simple


Yep, that a useful comment. Places like Northern Tool sell gauges for very little that are probably entirely adequate for most owners. Gauges from hydraulic suppliers tend to be pro quality and more pricey. People use old welding bottle gauges as well but they probably aren't as damped as an actual hydraulic gauge.

Here's some detail that might interest some people. A simple test point would be one replacing one of the loader cylinder hoses with a gauge. When the valve is operated the gauge would show the operating pressure.

However, sometimes it could be a little hard to know what actually is being tested. In this hook up, the gauge blind ends the circuit and a relief valve limits the operating pressure. However, on many tractors there would be two relief valves in the line (one in the loader valve and the tractor's system relief valve). Either relief valve could produce low readings. Many valves also have relief valves on the cylinder lines for shock loads. There could be three relief valves in the line.

Yep, bunches of diagnostics can be done with a gauge, although several with different scales may be needed. A t-fitting hook up will measure operating pressures produced by a load. A connection to a hydraulic manifold block will test the system relief valve alone. There often is a port on the 3ph for testing the 3ph cylinder pressure, because there's also a relief valve in most 3ph's. Gauges are available that measure flow as well as pressure, but they are fairly expensive.

In any testing, care should be taken not to run the engine when the pump is blinded ended. Without a relief valve in the system the engine probably couldn't be started, a reading taken and shut down fast enough to prevent damage to the pump.






Reply to PostReply | Quote Post Reply to PostQuote Reply | Add PhotoAdd Photo




Bookmarks: Digg It | Del.icio.us |
 12-16-2002, 17:29 Post: 46182
jeff r



View my Photos

View my Photos  Pics
Join Date: Jul 2003
Location: burton. michigan
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster
Posts: 428

2
Filter by User
 Hydro relief pressure testing made simple

You are most correct Tom, the guage would reflect the lowest of the two pressures and 1660 is lower than my tractors relief pressure. That means the loaders' relief valve opens first.






Reply to PostReply | Quote Post Reply to PostQuote Reply | Add PhotoAdd Photo




Bookmarks: Digg It | Del.icio.us |
 12-17-2002, 10:36 Post: 46216
TomG

TP Contributor

Join Date: Feb 2002
Location: Upper Ottawa Valley
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster
Posts: 5406

3
Filter by User
 Hydro relief pressure testing made simple

Jeff: Yep that's what I'd do as well. If the pressure goes up when adjusting the loader or hoe valve relief then that's the culprit. If not, then there's a slightly more difficult problem of determining if the valve is broke another valve or maybe even the pump is weak.

Having said all this, I suppose I'll have to actually get a gauge. I've been trying to figure how to t-fit one into my PS line while avoiding purchasing an absurdly expensive fitting from NH for about a year now. I also think the relief valve on my hoe is weak. That's a similar hook up so it might get me motivated.






Reply to PostReply | Quote Post Reply to PostQuote Reply | Add PhotoAdd Photo




Bookmarks: Digg It | Del.icio.us |
 12-22-2002, 03:38 Post: 46422
Morgan
2002-12-22 00:00:00
Post: 46422
 Hydro relief pressure testing made simple

How do you set the relief pressure valve? Where is it? Why couldn't somebody just raise the relief pressure without testing it with a guage first?

Of course the engine has to be running at full RPM for all this to count, my rig has low pressure when the engine RMP is not running at full speed. To get full loader power the engine has to be revving all the way.






Reply to PostReply | Quote Post Reply to PostQuote Reply | Add PhotoAdd Photo




Bookmarks: Digg It | Del.icio.us |
 12-22-2002, 07:23 Post: 46427
TomG

TP Contributor

Join Date: Feb 2002
Location: Upper Ottawa Valley
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster
Posts: 5406

3
Filter by User
 Hydro relief pressure testing made simple

Many but not all valves assemblies use for loader hoes etc. have their own relief valves. They usually are screw adjustable and the location would vary. Tractors also have their own relief valves. Mine is in a manifold block and is adjustable by shims.

Certainly a relief valve could just be cranked up without using a gauge. Relief valves are intended to protect components. There's no good way to ensure the setting isn't too high without a gauge and gauges are pretty cheap. The tractor's relief valve would provide adequate protection for most valves so from some perspective, a loader's relief valve could be cranked shut to rely on protection from the tractor's relief.

A small distinction about engine RPM: A basic idea in hydraulics is that loads produce pressure while pumps produce flow. Increasing RPM increases flow but not pressure directly. Only enough pressure to move a load can be developed. There is a but here. All pumps and cylinders have some internal leakage and the volume of leakage increases with pressure.

At high loads and low RPM's a pump's flow may be barely keeping up with the internal leakage and a loader would move very little. For that reason increasing RPM may lift a load that wouldn't move at low RPM, but it's really more flow rather than more pressure. It's a small distinction, but it might be interesting to some people.






Reply to PostReply | Quote Post Reply to PostQuote Reply | Add PhotoAdd Photo




Bookmarks: Digg It | Del.icio.us |
Reply | Pop Up Window Reply | Add PhotoAdd Photo


Page [ 1 ] |

Discussion Boards > Active Subjects > Messages as Posted > Kubota Review Forum

Thread 46148 Filter by Poster:
Billy 1 | jeff r 2 | Morgan 1 | TomG 3 |

 (advanced search)

Picture of the Day
Anthony7

Tractor Engine Repair Rebuild - Foton 45  3PH will not lift
Foton 45 3PH will not lift


Unanswered Questions

Belarus 825 - needs a new clut
Drain Cock
Need more hydraulic flow for s
HINOMOTO HB 501
Belarus 420A - Problems bleed

Active Subjects

460 Long hyd leak
460 axle
Key will not start engine
6x4 engine rebuild vsHarbor Fr
Things we say and what do they
The Plus and Minus of Ignoring
Looking to buy a New Pickup Tr
Need more hydraulic flow for s


Hot Topics

Tractor Category 1 2 3 Hitch s
Duerr hp 678 Chipper replaceme
Gator 620i gas in engine oil
KUBOTA Tractor Trouble Free Qu
Gator 6x4 Overheating problem
Duerr hp 678 Chipper Manual
Adjusting 7308 Pressure Relief
Long 460 hydraulic problem


Featured Suppliers

Mountain Creek Labradoodles
      MountainCreekLabradoodles.com





New Forums on Gun Sport Shooting and Hunting -- BarrelPoint.com  New Forums on Horses ManePoint.com
Talk Horses at ManePoint
Hunting + Gun Sports at BarrelPoint



Most Viewed

+ Kubota AT70s Rear Tine Tiller
+ Kubota HST GST Shuttle or Gear Transmission
+ Best Boom Mower for Kubota B2710 Tractor
+ Definition of Tractor Loader Breakout force
+ Kubota B3200 vs JD 2720
+ New Kubota L3240 First Look Review
+ Kubota Transmission Fluid SUDT
+ Kubota BX2230 VS kIOTI CK20HST
+ KUBOTA Tractor Trouble Free Quality
+ kubota bx25 vs john deere 2720

Most Discussion

+ How to match Truck to Trailer
+ New Kubota L3240 First Look Re
+ Kubota Number 1 in Compact Tra
+ KUBOTA Tractor Trouble Free Qu
+ Source for after market produc
+ 3-Point Quick Hitch
+ B 7100 ST - Making the Leap
+ Kubota Transmission Fluid SUDT
+ Kubota vs John Deere Compact T
+ L3130HST vs JD4310Hydro HELP

Newest Topics

+ Kubota B2301 vs Deere 2025R vs Mahindra Max24
+ 5040 shear on my PTO shaft
+ Kubota B7100 HST Flipped Will Not Move
+ Kubota b7100-hst
+ B2601 vs bx1800
+ 2000 B2710 I need a loader dealer wants over 4K an
+ Upgrading the Factory 145amp Alternator to 40 Amp
+ Kubota BX2750 Snowblower Fan Shear Pin Alignment
+ Size Kubota for Homeowner Use
+ I need some OEM Quality decals for a B7500 DT-TLB
















Turbochargers for Tractors and Industrial Machines
Cab Glass for Tractors and Industrial Machines

Alternators for Tractors and Industrial Machines
Radiators for Tractors and Industrial Machines

Driveline Components for Tractors and Industrial Machines
Starter Motors for Tractors and Industrial Machines