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LW-7 BH
Jul 3, 2010 16:14:27 GMT -5
Post by traktorz on Jul 3, 2010 16:14:27 GMT -5
I'm glad the photos helped. I like the idea of attaching your hook where where your latest place is. Indeed it would be there for any bucket changes. I presume with the bucket fully curled, you would drape the chain over the bottom of the bucket or over the sides of curled bucket, right? So that would work fine without hurting the boom. If you drape the chain over the end, over the bottom of the bucket, be sure it does not slip off the bucket. One advantage of having the hooks on the bucket itself, is that you can then use either the dump or curl to start moving the chain, or to tension it before lifting. I think I might have a few extra "weld-on" grab hooks like are on my equipment. If you want, I can send you a couple of them at no charge. All I ask is that you pay for shipping. If interested, send me an email or PM and give me your address. I will then look for the hooks in the barn and mail them to you. Rob- I like the fact that you can dump/curl the bucket to tension before lifting with the hooks on the bucket itself. Thanks for the generous offer of the rare hooks not available over here. I'll write you a PM with my shipping details. I have a PayPal account, which I could use?
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LW-7 BH
Jul 21, 2010 16:43:18 GMT -5
Post by traktorz on Jul 21, 2010 16:43:18 GMT -5
The new cathegory 1 toplink needed to be short, ~42cm. It's connected between the stabilization frame and the drawbar. The toplink supplied with the tractor couldn't be shortened enough, and we were lucky to find one vendor in Sweden to provide these. We have now had the backhoe mounted to the tractor for one month, and it has been working fine with two small exceptions. I had to repair the valve kit, since a loose lock pin caused the valve joystick for the bucket/boom to become loose. The other problem is the PTO gearbox that is leaking oil, through the combined fill/ventilation plug I suspect. Ideally the gearbox should be equipped with two separate plugs and interchangeable, so that I could mount the gearbox upside down, for better spacing. Right now it's mounted with an angle, but I should fix this, probably first time the backhoe is off the tractor. The backhoe balances the tractor well, which gives a better traction with a full load of the FEL. The BH is definitely a recommended item.
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r2
CTW Member
Posts: 3
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LW-7 BH
Jul 22, 2010 0:18:26 GMT -5
Post by r2 on Jul 22, 2010 0:18:26 GMT -5
Ideally the gearbox should be equipped with two separate plugs and interchangeable, so that I could mount the gearbox upside down, for better spacing. Right now it's mounted with an angle, but I should fix this, probably first time the backhoe is off the tractor. Do not mount the gearbox/pump upside down. You will not get enough lube to driving gear that way. Because then the lube oil have to "climb" up.
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LW-7 BH
Jul 22, 2010 0:57:39 GMT -5
Post by traktorz on Jul 22, 2010 0:57:39 GMT -5
Ideally the gearbox should be equipped with two separate plugs and interchangeable, so that I could mount the gearbox upside down, for better spacing. Right now it's mounted with an angle, but I should fix this, probably first time the backhoe is off the tractor. Do not mount the gearbox/pump upside down. You will not get enough lube to driving gear that way. Because then the lube oil have to "climb" up. However, I haven't read the specification for the explicit gearbox that is delivered with our LW-7. But a similar gearbox from a popular Swedish vendor actually states that you can mount the gearbox/pump assembly upside down, see www.oeparts.se/Archive/Bilder/ProduktPdf/ANV029.pdf, provided that the breathing/drain plugs are shifted. P.S. The leaking gearboxes is a known flaw of the those delivered with the Chinese backhoes. In fact, the importer rather suggests to fill the gearbox with grease instead. We could also test with a thicker gear oil SAE90 EP, rather than the current STOU 10W/30 STOU oil we're using.
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LW-7 BH
Jun 16, 2011 2:16:43 GMT -5
Post by traktorz on Jun 16, 2011 2:16:43 GMT -5
I need a new mesh filter for the LW-7 hydraulic tank: I hope this is available as a spare part, but how to get hold of one? EDIT: Luckily the Scandinavian importer had the suction strainer tank filter spare parts, so now I'm going to complete the overhaul and put the backhoe into service again.
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LW-7 BH
Jul 16, 2011 10:08:08 GMT -5
Post by traktorz on Jul 16, 2011 10:08:08 GMT -5
LW-7 BH Hydraulic performance upgrading How much valid are these nomograms to explore your hydraulic system, in this case our Backhoe LW-7 from Shandong China? Originally this backhoe came with a CBN-E310 pump. The gearbox and the pump brooke and we got a Parker CBT-E316FBR2 as replacement, with an increased flowrate from 20 l/min to 32 l/min. And now we are considering a Prince HC-PTO-7A (26.9 l/min), since the gearbox broke again. Looking at the nomograms, it explains why the hydraulic fluid became warm with the larger pump. The hoses aren't really dimensioned for that larger flow. I am surprised at how tiny the hoses are on these backhoes, but in reality it seems to work fine in most cases. Hoses on the LW-7 are marked with the ratings according to this table: • Tank Return Hose (1-10-16) • Suction Hose (1-13-14) • Pump Pressure Hose (2-8-40) • The original pump: CBN-E310 • The upgrade pump: CBT-E316FBR2 • The new Prince: HC-PTO-7A • The original pump: CBN-E310 & The upgrade pump: CBT-E316FBR2 • The original pump: CBN-E310 & The new Prince: HC-PTO-7A with increased hose sizes. • The new Prince: HC-PTO-7A with increased hose sizes. • Recommended inner hose diameter table for acceptable flow velocity. I am also adding a tank return filter through the 1/2" hoses. Will it make sense to have a small indicator manometer to check when it's time to replace the spin-on filter? If changing the three hoses on the backhoe, will it be necessary to check the PRV setting of the valve-kit? I am reading from the backhoe manual that the Hydraulic System Pressure is set to 16 MPa, but I've never been able to verify that. Prince recommends a bit lower, 15 MPa, so I might have to invest in a manometer to be able to check this out carefully. Does it make sense to mount the manometer permanently. Does it give any valuable monitoring information while digging? Question: How many of you have checked the system pressure of your backhoe and tractor. What pressure setting will I find? 14 +/2 MPa? What is acceptable? At what PTO speed? P.S. I can tell it hasn't been easy to alter the hoses of the Chineses manufactured Backhoe, since the hydraulic hose shops here haven't seen the "Metric Thread O-ring Flat Seat Hydraulic Hose Fittings" before. Some comments in the referenced threads here below. Ref:
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LW-7 BH
Jul 16, 2011 11:33:36 GMT -5
Post by traktorz on Jul 16, 2011 11:33:36 GMT -5
LW-7 The old hoses These are the three hoses, we are replacing on our BH: • Tank Return Hose (1-10-16) • Suction Hose (1-13-14) • Pump Pressure Hose (2-8-40) P.S. I've added the standardised product numbers for the Chinese "Metric Thread O-ring Flat Seat Hose Fittings", together with some measurements on outer diameter of the hose, as well as the inner diameters of the fittings. All with the intent to investigate where eventual flow restrictions occurs, and to optimise for a performance increase with the new pump and hoses.
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LW-7 BH
Jul 17, 2011 0:18:13 GMT -5
Post by traktorz on Jul 17, 2011 0:18:13 GMT -5
Flow control necessary? Do I get too much flow from the new pump, 26.9 l/min for the HC-PTO-7A compared to the original CBN-E310 with 20.0 l/min? Can I somewhat reduce the flow by running the tractor engine (C490BT) at a lower rev.? I expect the tractor's PTO delivers 540 rpm at about 85% of the nominal engine speed, (85% * 2400 = 2040 rpm). Running at a lower speed, while still delivering the required torque to the pump, which is 11.9 hp @ PTO 540 rpm. Or should I start looking for something like the Prince Flow Control Valve - RD-150-8 0-8 GPM 1/2" Pressure Compensated Flow Control Valve - Top-Ports? Well, I'm not going to add any more plumbing now with any extra valves, rather I'll examine the performance of the new pump installation first. Here's pictures of the old hoses and a picture of the new hoses just been made. Note that I haven't gone for the Prince recommended 1" suction line size, but reduced to 3/4", which required a custom made M22x1.5 fitting to the tank strainer port.
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LW-7 BH
Jul 17, 2011 1:52:10 GMT -5
Post by traktorz on Jul 17, 2011 1:52:10 GMT -5
Three new hoses with all the adaptors and fittings specified: • Suction Line Hose (1-13-14) • Tank Return Hose (1-10-16) • Pump Pressure Hose (2-8-40)
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LW-7 BH
Jul 22, 2011 6:04:45 GMT -5
Post by traktorz on Jul 22, 2011 6:04:45 GMT -5
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LW-7 BH
Jul 22, 2011 6:11:37 GMT -5
Post by traktorz on Jul 22, 2011 6:11:37 GMT -5
A tank return filter has been added. According to the specific pump, 1/2" hoses should do, although the filter holder is capable of 3/4" connection. We're also planning to add an indicator manometer, to monitor when it's necessary with a filter cartridge replacement.
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LW-7 BH
Jul 22, 2011 6:15:37 GMT -5
Post by traktorz on Jul 22, 2011 6:15:37 GMT -5
To sum it up, here's a schematic of the original and the modified hydraulics for our LW-7 backhoe.
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LW-7 BH
Jul 25, 2011 1:12:00 GMT -5
Post by traktorz on Jul 25, 2011 1:12:00 GMT -5
Agrol Turbo Kombi (STOU) eller dedicerad Hydraul SHS 32/46At the same time as revisioning our Three Point Backhoe with a new pump and larger hoses for better flow, we are also moving to a dedicated hydraulic oil, but only for the backhoe cistern. Currently, the entire tractor and backhoe have been using a STOU oil. But after recommendations from our local oil company, I understand we'll get a prestanda improvement of the backhoe, especially at lower temperatures, if changing to a dedicated hydraulic oil (ISO VG 32/46). Since we are not using the backhoe in winter times, it would be just silly of us to use the thinner ISO VG 32 viscosity. Especially, since there is a general rule of thumb, that it's always better with using a higher viscosity than too low dito. (However, some machines can need ISO VG 32 for a good function at low temperatures.) For our backhoe, we therefore decided on ISO VG 46 from now on. SHS 32 SHS 46 SHS 68 STOU Viskositet 40°C 32.7 46.9 68.8 71 mm²/s Viskositet 100°C 7.5 9.4 11.9 11.2 mm²/s Viskositet -20°C - - - 1750 4800 2900 mm²/s Viskositetsindex 208 190 170 149
APPENDIX: (from another tractor forum) Choosing the best oil for the Chinese made Tractor & Backhoe We have a Chinese Foton FT404 tractor, that takes: STOU 10W/30 GL-4 (equiv. SAE80W transmission oil):
• Engine sump 7 l (API CD) • Gearbox 27 l (MF1135, M2C 86A, JD J20A) • Front axle 7 l (MF1135, M2C 86A, JD J20A) • Lifter 12 l (UTTO for hydraulics) • Steering 0.8 l (UTTO for hydraulics)
I would recommend what our dealer already has put into the tractor at the delivery, Agrol Turbo Kombi, a STOU oil. Similarly we can use Statoil MultiWay or OKQ8 T1000, all 10W-30. We can also use Biltema Tractor Oil Universal, Kombiolja 10W-30 at 299 SEK for 10 liter.
In the FOTON user's manual, the requirement for oil is separated for the engine (MOTOR) and for the transmission/hydraulics (UTTO). These STOU oil recommendations above exceeds the requirements for the tractor. Both the low cost and the handling of a single oil bought in large quantities (10 or 20 liter) makes STOU a given for these 1980-decade of tractor technology.
That's what we practise with our Foton FT404, and it also came with Agrol Turbo Kombi oil in all reservoars. It worked well during the Nordic cold winter period as well.
We have also found Baldwin equivalents for the fuel & lube filters: Clarcor Filtration: WBF7608 -> Baldwin BF7608 Clarcor Filtration: WB202C -> Baldwin B7451
*) STOU = (SUPER TRACTOR OIL UNIVERSAL) UTTO = (UNIVERSAL TRACTOR TRANSMISSION OIL) Ref:
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LW-7 BH
Aug 29, 2011 7:30:44 GMT -5
Post by traktorz on Aug 29, 2011 7:30:44 GMT -5
We have a one year old Chinese made backhoe LW-7 (serial number LW7U116M 100 8100 405) from Shandong Sunco Agricultural Equipment Technology Co., Ltd ( www.sdnyzb.com), that we're currently using together with our 2009 Foton Europard FT404 tractor. Using the tractor for other purposes (lumbering and wood), the digging has been given low prioritises this year. Of course, we've been very curious on the upgrade of the backhoe to check whether the expected improvements really are noticeable. It's always a bit tricky to mount the backhoe, given the many stabilizer pieces. It's a two person job, and with frequent use of the garage hydraulic jack, we finally got it mounted, but a bit different from last year. Last year the backhoe rested on the drawbar at transport, this year we need to use the TPH lifter to stabilize during transport. I'll check the optimum mount after evaluating this years mounting. However, when digging, the sideleg stabilizers provides the most support. We filled up the tank reservoar with ISO VG 46 hydraulic oil, and initially all semmed to be working smooth and well. But after some time, with me in the digging chair, I start hearing noise from the system, simlilar to the cavitation noise from last year when using the bigger Parker CBT-E316FBR2 pump. Also I could feel some temeperature increase of the tank return filter casing. Driving back home to our garage, adding some more hydraulic fluid, we never saw this problem again. No cavitation, no heat build up either. The cause of the cavitation problem was tank related. All the hoses and cylinders were empty and needed to be filled with oil, causing more oil needed to be added to the tank reservoar. The suction line is not that deeply located on the tank, so while leaning too much sideways of the tractor/hoe combo when digging, the pump didn't get the unrestricted flow and started to cavitate. Regarding performance of the backhoe, our opinion is that the Parker pump of last year gave us a better performance and more parameters to play with. The CBN/CBT pumps are the standard pumps mounted on every China-made tractor, there working problemfree for both the hydraulic power steering as well as for the hydraulic TPH lifter & FEL needs. However, the weakest point of our last years backhoe system, was the very low mechanical quality of the PTO gearbox itself. Of course, we could have bought a better made gearbox for the pumps we have, but we were attracted with the space saving of the Prince PTO pump, since it has the gearbox integrated into the pump itself. Performance wise, the Prince has no advantage over the corresponding CBN/CBT types, since in hydraulics it's only about two parameters, flow and pressure.
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LW-7 BH
Oct 26, 2011 23:22:21 GMT -5
Post by bradblazer on Oct 26, 2011 23:22:21 GMT -5
Nice work replumbing your backhoe. Thanks for documenting everything so well here.
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