Importing and modifying a new mini excavator from China

[dfkrug]

If I did go with a smaller pump, the cylinders moving slower would be good, and of course the pressure would be the same but what effect do you think the reduced flow would have on my track drive motor power? Would the torque be the same and just move slower or would I lose power as well?

Torque at the drive sprockets is a function of hydraulic pressure and motor volume. Pretty much the only time I have stalled the drive sprockets (system RV opens) is when I get a rock jammed in the tracks.

Now POWER at the sprockets (actual work done-speed) is a factor of pressure and flow, but your engine can deliver more power at higher RPM, versus at lower RPM.

If you look at the power curve for a 420cc gas engine, you may see something like 10hp at 3000 RPM, and 15hp at 3600. So, running the engine faster to get higher flow with a smaller pump would deliver more work (power) to the drive sprockets.

A smaller pump would allow you to run the engine slower in less-than-maximum demand situations. This "sweet spot" is about 3000RPM. 2000RPM for any of the diesels, 1-3cyl.

 

[HCS-II]

In a previous post, I had surmised that the Diggit EM15 OEM may be LeKing but the track base and slew tower is different between the EM15 and LeKing's KV13 Plus. Just found out the the Diggit EM15's OEM is Shandong Jianggong Machinery Co. (SDJG) and they market this model in their own brand lineup as the JG-15: JG-15 Mini Excavator-Mini Excavator-Shandong Jianggong Machinery Co., Ltd. Hope this info can be useful to other EM15 owners.

 

[D'oh]

They look to be the same as FF15's that are running through the auctions here also

 

[dfkrug]

Diggit EM15's OEM is Shandong Jianggong Machinery Co. (SDJG) and they market this model in their own brand lineup as the JG-15:

Sure looks like it. Owners should try to contact them and get info on the hydraulic system, including the pilot control pressure and test port. I see their website offers an email address and a contact window.

 

[HCS-II]

They look to be the same as FF15's that are running through the auctions here also

When looking closely at the machines the FF15 seems to be a different beast altogether: shorter tracks (180x72x37 and two bottom idler rollers for the FF15 vs. 180x72x41 and three bottom idler rollers for the EM15), boom is not the same design (FF15 has similar designs as other FF Industrial and AGT machines), foot controls are different, left joystick console does not lift (safety cutoff is a manual toggle switch instead of being integral to the lift of the console on the EM15), FF15 has less ventilation holes as the EM15, electrical cut-off switch mounted on the left joystick console instead of the the kickplate under the seat (better design IMO), different front blade, different roof and support structure, comes with a manual thumb while the EM15 has none as standard issue, no aux. lines shutoff valves on the dipper, etc...

I honestly don't know who manufactures the FF15 but it doesn't look like its a standard product from LeKing or SDJG.

 

[HCS-II]

Sure looks like it. Owners should try to contact them and get info on the hydraulic system, including the pilot control pressure and test port. I see their website offers an email address and a contact window.

I will most likely contact them to enquire about availability of replacement parts like pumps and hydraulic motors. Aside from pilote control relief pressure and tests port location, what other information would you like to get?

 

[dfkrug]

I will most likely contact them to enquire about availability of replacement parts like pumps and hydraulic motors. Aside from pilote control relief pressure and tests port location, what other information would you like to get?

I am curious if that unit has return filtration, and if it is the same as on the EM15, which does need an upgrade to something better with a spin-on replaceable filter.

Anyone who buys one should definitely open it up to see how it works.

 

[D'oh]

When looking closely at the machines the FF15 seems to be a different beast altogether: shorter tracks (180x72x37 and two bottom idler rollers for the FF15 vs. 180x72x41 and three bottom idler rollers for the EM15), boom is not the same design (FF15 has similar designs as other FF Industrial and AGT machines), foot controls are different, left joystick console does not lift (safety cutoff is a manual toggle switch instead of being integral to the lift of the console on the EM15), FF15 has less ventilation holes as the EM15, electrical cut-off switch mounted on the left joystick console instead of the the kickplate under the seat (better design IMO), different front blade, different roof and support structure, comes with a manual thumb while the EM15 has none as standard issue, no aux. lines shutoff valves on the dipper, etc...

I honestly don't know who manufactures the FF15 but it doesn't look like its a standard product from LeKing or SDJG.

Good Eye, But I like the B&S in the FF-15.

Is the Track Tension on the Diggit EM15 a Grease type or Bolt?

 

[HCS-II]

Good Eye, But I like the B&S in the FF-15.

Is the Track Tension on the Diggit EM15 a Grease type or Bolt?

Bolt type. Waiting for the last fittings to arrive to complete my hyd. filter and cooler install and then will be able to share pictures. Seller of the cooler on AliExpress told me the fittings where BSPP but when I received it it required BSPT! Well, another two-weeks delay...

 

[JohnnyB24]

In a previous post, I had surmised that the Diggit EM15 OEM may be LeKing but the track base and slew tower is different between the EM15 and LeKing's KV13 Plus. Just found out the the Diggit EM15's OEM is Shandong Jianggong Machinery Co. (SDJG) and they market this model in their own brand lineup as the JG-15: JG-15 Mini Excavator-Mini Excavator-Shandong Jianggong Machinery Co., Ltd. Hope this info can be useful to other EM15 owners.

Thanks, that is some very good info. Mine looks the same only it's branded as a Miva VA15. I would love to get a part number for the return filter inside the reservoir. I do plan to change it to an external spin on in the future but that may be at the same time I install a new lower output pump. From the specs listed, it looks like the existing pump is 10.6GPM. I would love to have something around 8GPM.

I have about 13 hours on it so far and I'm very happy with it. As long as I run it just above idle it's very smooth. On to the next project!