(800) 853-2651
SHOP NOW

4020 HP / Load adjustment?

R

Rapidrob

Member
I noticed that my tractors propane may be being burned faster than needed.*
I read that there is a HP / Load test that can be done by disabling a couple cylinders and allowing the engine at a certain RPM and at Temp, can be adjusted by turning the T-handle valve on the bottom of the carburetor. Have you ever done this? Does it help with fuel consumption?
I only run a snow plow and never the PTO in winter. Most of the time I'm running at 1,000 RPM in the higher gears.
I read that fuel consumption will be 8.8 to to over 10 gallons an hour. Is this also correct?
Thanks for any helpful info.

* Compression is almost at new specs for LPG. New spark plugs gaped properly. New plug wires and cap,points,condenser. New high performance ignition coil. New Battery.
No gas leaks. Liquid / Vapor valves shut off with no leaks. Added gas shut off valve from tank to vaporizer.
When parked,gas level never drops from shut off level.
Engine starts and runs very smoothly,no misses.
I live at 7,000 Feet ASL.

This post was edited by Rapidrob on 01/31/2022 at 08:55 pm.
 
(reply to post at 23:51:40 01/31/22)
Click to expand...
I've never heard of the test you mentioned operating 6 cyl engine on 4 cylinders to adjust carburetor. I think 8 gph fuel usage @ 1000 rpm for LPG would be very excessive fuel consumption.

Have you checked distributer timing & checked spark advance mechanism inside distributer to be sure it's functioning as designed?
 
You might be able to lean it down some, but remember that LP has less BTU per gallon than diesel or gas has per gallon. For a given load, if a diesel will use say five
gallons per hour, LP will use seven-eight gallons per hour. Do you have a PTO dyno close by to see if some minor adjustments would help?
 
(quoted from post at 05:27:08 02/01/22) You might be able to lean it down some, but remember that LP has less BTU per gallon than diesel or gas has per gallon. For a given load, if a diesel will use say five
gallons per hour, LP will use seven-eight gallons per hour. Do you have a PTO dyno close by to see if some minor adjustments would help?
Click to expand...

No way to check the PTO output for HP.
I'll see if I can find the article again about removing the two cylinders for a load adjustment.
The distributor is working normally.
Timing needs to be checked again.

I'll try to lean the carb out and see what happens under load.
 
(quoted from post at 06:17:15 02/01/22)
(quoted from post at 05:27:08 02/01/22) You might be able to lean it down some, but remember that LP has less BTU per gallon than diesel or gas has per gallon. For a given load, if a diesel will use say five
gallons per hour, LP will use seven-eight gallons per hour. Do you have a PTO dyno close by to see if some minor adjustments would help?
Click to expand...

No way to check the PTO output for HP.
I'll see if I can find the article again about removing the two cylinders for a load adjustment.
The distributor is working normally.
Timing needs to be checked again.

I'll try to lean the carb out and see what happens under load.
Click to expand...


I copied the page from a JD service manual and it says to disconnect FOUR cylinders and start the engine to adjust the load. ( see upper left hand paragraph )

https://imgur.com/PERm9Tm

This post was edited by Rapidrob on 02/01/2022 at 06:13 am.
 
My understanding is that because LPG has a very low BTU compared to gasoline and diesel, a tractor under load will burn more GPH
than with diesel or gasoline. I remember working for my uncle in the 1950's who ran two Case LA tractors on propane, that they
would not run more than about six hours on a 42 gallon tank of LP. Always took the tractors to the farm to refuel at noon. When
we got our first JD two cylinder, diesel, 730, we could run a long day on a 20 gallon tank of fuel. So....even though LPG was
cheaper per gallon than diesel, overall there wasn't that much difference. Anyway, that was my experience as I remember it.









 
The fuel consumption was taken right from the Nebraska JD 4020 test in 1963.
I'm going to keep track of the tank gauge for % to estimate how many gallons I'm using.
 

We got 10" of snow last night and was -6 F this morning.
I was able to put 20 pounds of Propane in the tank . The tractor fired right up and I plowed my 1/4 mile road and my neighbors parking area. Ran the tractor at 1,000 - 1,500 RPM in gear 7 and burned 2 gallons in 1 1/2 hours.
 
I remove 10 of snow in sub-zero weather and plowed for 1 1/2 hours. I used 2.0 gallons of propane with the engine in 7TH gear and 1,000-to 1,5000 RPM.
 
You must log in or register to reply here.

Similar threads

M
John Deere 1010 dozer not starting
Replies
6
Views
490
Dan in Ohio
Dan in Ohio
O
New to me JD 620 PTO/3 pt issues
Replies
11
Views
1K
offroad23
O
D
51 JD A carb issue
Replies
6
Views
428
Danny Boy
D
V
new owner of a 620, will try to update this as we go.
2 3 4
Replies
61
Views
3K
valiant8086
V
B
Ford 420 No fuel to injectors
2
Replies
23
Views
891
Dieseltech
D
Tractor Parts Tractor Manuals

We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today.

Copyright © 1997-2024 Yesterday's Tractor Co.

All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.

Yesterday's Tractors - Antique Tractor Headquarters
Website Accessibility Policy

Back
Top