The New Holland 7840 tractor PTO horsepower is 90 hp | 67.1 kW, and the drawbar horsepower is 75.2 hp | 56.1 kW.
PTO HP90 hp | 67.1 kW
Drawbar HP75.2 hp | 56.1 kW
Displacement401 ci | 6.6 L
New Holland 7840 Horsepower Specs
PTO horsepower claimed
90 hp | 67.1 kW
PTO horsepower tested
90.4 hp | 67.4 kW
Drawbar horsepower tested
75.2 hp | 56.1 kW
New Holland 7840 Useful Horsepower Calculations
Drawbar-to-PTO power ratio
83.6% drawbar hp vs PTO hp
Engine size per PTO horsepower
4.5 ci per PTO hp
PTO horsepower per liter
13.6 PTO hp per L
Rated speed per PTO horsepower
23.3 rpm per PTO hp
New Holland 7840 Engine Specs
Displacement
401 ci | 6.6 L
Bore and stroke
4.40×4.40 inches | 112 x 112 mm
Compression
17.5:1
Rated RPM
2100
New Holland 7840 Fuel, Cooling, Starting & Service Specs
Starter volts
12
Battery volts
12
Firing order
1-5-3-6-2-4
Idle RPM
725-2275
Intake valve clearance
0.016 inches (cold) | 0.406 mm
Exhaust valve clearance
0.019 inches (cold) | 0.483 mm
New Holland 7840 Horsepower Comparison Charts
PTO horsepower comparison
This model
90 hp
Average
65 hp
Low
35 hp
High
105 hp
Drawbar horsepower comparison
This model
75.2 hp
Average
55 hp
Low
30 hp
High
95 hp
Displacement comparison
This model
401 ci
Average
260 ci
Low
150 ci
High
380 ci
Rated RPM comparison
This model
2,100 rpm
Average
2,200 rpm
Low
1,800 rpm
High
2,700 rpm
Engine size per PTO HP
This model
4.5 ci/hp
Average
3.5 ci/hp
Low
2.2 ci/hp
High
5.8 ci/hp
Benchmarks use practical low, average and high ranges for the utility tractor category. Use the operator manual and actual engine/tractor configuration before sizing implements or judging working power.
New Holland 7840 Horsepower FAQ
How much PTO horsepower does the New Holland 7840 have?
The listed PTO output is 90 hp, above the 65 hp benchmark average. That is the number to use for mowers, balers, augers, pumps and other PTO tools that need up to about 90 hp.
How much drawbar horsepower does the New Holland 7840 have?
The listed drawbar output is 75.2 hp, above the 55 hp benchmark average. That makes the 75.2 hp drawbar number more useful than engine hp for tillage and heavy pulling.
Is the New Holland 7840 better judged by PTO hp or drawbar hp?
The drawbar output is about 83.6% of PTO output, comparing 75.2 drawbar hp with 90 PTO hp. That helps separate pulling ability from PTO implement ability.
How big is the New Holland 7840 engine?
The engine displacement is 401 ci, above the 260 ci benchmark average. Bigger displacement can help low-rpm pull and load-holding feel.
Is the New Holland 7840 engine stressed for its PTO horsepower?
The engine has about 4.5 cubic inches per PTO hp, using 401 ci and 90 PTO hp. That points to a larger-displacement, lower-stress style setup.
How much PTO horsepower per liter does the New Holland 7840 make?
The output density is about 13.6 PTO hp per liter, using 90 PTO hp and 6.6 L of displacement. Higher hp/L means more output squeezed from each liter; lower hp/L usually means a more relaxed engine tune.
What rpm is the New Holland 7840 rated at?
The rated speed is 2,100 rpm, close to the 2,200 rpm benchmark average. The 2,100 rpm figure is around normal for this class.
Official information note
Horsepower and engine specs can vary by year, market, engine option, fuel system, test standard and tractor configuration. Check the operator manual, spec plate, parts book and official newholland.com website before buying parts, sizing implements or making repair decisions.
