hello new here with a 743 bobcat

[antfarmer2]

I have been trying to put this old girl back to work think I am getting close need the torque on the nut holding the spline on the back of the hydro pump and what kind of oil to use I have been looking around finding good info and am thinking to use 15-40 in everything so I can flush out the engine and the hydrolic and use that to fill the chain case any help would be great thanks to all

 

[antfarmer2]

Hi Tazza I thought I saw that you used 15-40 in your 743 hydro

 

[lfutrell]

Maybe this will help, look at my profile and send me a email and I will send you some manuals.
Ft-Lbs, Nm
Fuel Injector Pump Mounting Bolts​

... .. ...... .. ... . . . 17-20 23-27

Hydrostatic Pump Adapter Flange to Flywheel​

..... . 15-17 23-27

Engine Mounting Bolts​

...... .. .. . .. . . . .... .... . .. ..... . 65-70 88-95

Oil Pump to Block​

.. . . . . .. ... .. ... ..... . ... . .. . .. . ... . . 5-6 6,8-8,1

Gearcase Cover Bolts​

..... . .. .. .. . . ... .. . . . ...... . .. . 13-15 18-20

Flywheel Housing Cover​

. ... ............... . .. .. . ...... ... . 25-28 34-38

Hydrostatic Pump to Flywheel Cover​

... .. . . ....... . . . 65-70 88-95

Nozzle Holder​

. ..... . .. .. .... . ... ..... . . . . .. ........ . .... . 22-36 30-49

Flywheel to Crankshaft​

. .. .... .. . . ... ..... . ......... ..... . 72-80 98-108

Pulley​

to Crankshaft . .. . ... ... .... .. ... .. . ... . .... . 101-110 137-149

Water Pump Shaft Nut​

......... . ...... .. . .... .. . .. . ..... . 50-57 68-78

Crankshaft Rear Cover​

.. .. . .... . ..... . ..... . . ....... .. . 13-17 17-20

Valve Cover Nuts​

.. ... . ..... . .. . .. .. .. . .. . . . ... ... .. . . 5-6 6,8-8,1

Connecting Rod Caps​

. .......... . ... . .. . .. . ............. . 26-30 35-41

Bearing Case Bolt (1) Through Block​

... .. .... . . . . . 47-50 64-68

Bearing Case Halves Two Bolt Each​

.. . . ......... . .. . 21-25 28-34

Camshaft Mounting Flange
.... .... . . ... . .. ... .... . . . . 13-15 18-20

 

[antfarmer2]

Maybe this will help, look at my profile and send me a email and I will send you some manuals.
Ft-Lbs, Nm
Fuel Injector Pump Mounting Bolts
... .. ...... .. ... . . . 17-20 23-27

Hydrostatic Pump Adapter Flange to Flywheel
..... . 15-17 23-27

Engine Mounting Bolts
...... .. .. . .. . . . .... .... . .. ..... . 65-70 88-95

Oil Pump to Block
.. . . . . .. ... .. ... ..... . ... . .. . .. . ... . . 5-6 6,8-8,1

Gearcase Cover Bolts
..... . .. .. .. . . ... .. . . . ...... . .. . 13-15 18-20

Flywheel Housing Cover
. ... ............... . .. .. . ...... ... . 25-28 34-38

Hydrostatic Pump to Flywheel Cover
... .. . . ....... . . . 65-70 88-95

Nozzle Holder
. ..... . .. .. .... . ... ..... . . . . .. ........ . .... . 22-36 30-49

Flywheel to Crankshaft
. .. .... .. . . ... ..... . ......... ..... . 72-80 98-108

Pulley
to Crankshaft . .. . ... ... .... .. ... .. . ... . .... . 101-110 137-149

Water Pump Shaft Nut
......... . ...... .. . .... .. . .. . ..... . 50-57 68-78

Crankshaft Rear Cover
.. .. . .... . ..... . ..... . . ....... .. . 13-17 17-20

Valve Cover Nuts
.. ... . ..... . .. . .. .. .. . .. . . . ... ... .. . . 5-6 6,8-8,1

Connecting Rod Caps
. .......... . ... . .. . .. . ............. . 26-30 35-41

Bearing Case Bolt (1) Through Block
... .. .... . . . . . 47-50 64-68

Bearing Case Halves Two Bolt Each
.. . . ......... . .. . 21-25 28-34

Camshaft Mounting Flange
.... .... . . ... . .. ... .... . . . . 13-15 18-20

Thank you the engine seems ok just rebuilt gear cases and put on new chains pulled engine to get some new metal lines in changed u joints and rear hydro seal any info would be great first timer here any thoughts about the fluids?

 

[lfutrell]

Thank you the engine seems ok just rebuilt gear cases and put on new chains pulled engine to get some new metal lines in changed u joints and rear hydro seal any info would be great first timer here any thoughts about the fluids?

The 743 is a tough machine and simple to work on. In the one I had I ran Delvac 15W40 in the engine and a napa 10W30 in the hydro's, I used the old Hyd. Oil in my chaincase.

 

[antfarmer2]

The 743 is a tough machine and simple to work on. In the one I had I ran Delvac 15W40 in the engine and a napa 10W30 in the hydro's, I used the old Hyd. Oil in my chaincase.

Do you think I could use 15-40 for all can get it cheaper and I live in texas

 

[lfutrell]

Do you think I could use 15-40 for all can get it cheaper and I live in texas

It would be ok if it don't get below about 30 deg. If it gets colder than that I would use a lighter oil in the hyd.

 

[antfarmer2]

It would be ok if it don't get below about 30 deg. If it gets colder than that I would use a lighter oil in the hyd.

Thank you anyone else like to chime in?

 

[Tazza]

Thank you anyone else like to chime in?

Where i live, it never gets below freezing. I used to run 15W40 without any issues, i changed that to 20W50 because i got it really cheap and with the winters we get in Brisbane, it's not an issue.
If it gets really cold there, you may want something thinner. If you do use the 15W40 and have cold winters, if it's in a heated ship, it will be fine. The other way is to start it and leave it warm up for a while before using it when it's really cold out.

 

[antfarmer2]

Where i live, it never gets below freezing. I used to run 15W40 without any issues, i changed that to 20W50 because i got it really cheap and with the winters we get in Brisbane, it's not an issue.
If it gets really cold there, you may want something thinner. If you do use the 15W40 and have cold winters, if it's in a heated ship, it will be fine. The other way is to start it and leave it warm up for a while before using it when it's really cold out.

Thank you Tazza I am in Texas it can get below freezing here but not to often and can wait till it warms up to play with it so I should be ok

 

[frogfarmer]

Thank you anyone else like to chime in?

Ive run 15-40 in an 843 for years and no problems. I realize not the same but all I can add.

 

[antfarmer2]

Ive run 15-40 in an 843 for years and no problems. I realize not the same but all I can add.

Hi Frog nice to see another farmer in here where do you live I am in Texas it can get below freezing here but not to often and just a personal toy so I can wait till it warms up any one else thanks to all The Ant

 

[frogfarmer]

Hi Frog nice to see another farmer in here where do you live I am in Texas it can get below freezing here but not to often and just a personal toy so I can wait till it warms up any one else thanks to all The Ant

South East MO here and the weather is mostly above freezing. My machines stay inside so an overnight cold snap doesn't change the temps inside the buildings. If it gets too cold I can turn on the heat. Just picked up a couple of New Holland machines with 12,000hrs between them and always on 10-30 and somewhat poor maintenance. Pumps and drives are all original and strong on the New Hollands. So it would seem the 10-30 is a good combo as well.

 

[antfarmer2]

South East MO here and the weather is mostly above freezing. My machines stay inside so an overnight cold snap doesn't change the temps inside the buildings. If it gets too cold I can turn on the heat. Just picked up a couple of New Holland machines with 12,000hrs between them and always on 10-30 and somewhat poor maintenance. Pumps and drives are all original and strong on the New Hollands. So it would seem the 10-30 is a good combo as well.

Thank you I think I will go with 15-40 I can get it cheaper and can have one oil everything is drained so I will flush motor and hydros out with it and use that to fill the gear case unless I hear anything better thanks to all