ZF 25 A (HSW 250 A)
TECHNICAL DATA
Configuration:   8° Down Angle
Mounting:   Direct to Engine.
Bell Housings:  B/W, SAE 5, Yanmar 4JH adaptor, SAE 4. 
Weight (approx. dry):  24 kg (53.5 lbs)
Oil capacity (approx.):  1.80 litres (1.91 US quarts)
Fluid Grade:   ATF
Standard Input Rotation:  Anticlockwise engine rotation when looking at the flywheel end.

*Dimensions and weights refer to transmissions with bell housings but excluding options such as: trolling valves, power take-offs, propeller shaft companion flanges, torsional couplings etc.

PLEASURE DUTY CLASSIFICATION
MODEL RATIOS MAXIMUM INPUT POWER
"A" "B" 2300 rpm 2800 rpm 3200 rpm HP/rpm ft.lb kW/rpm Nm
HP kW HP kW HP kW
ZF 25 A
(HSW 250 A)		 1.550
1.930		 1.550
1.930		 100 75 122 91 139 104 0.0436 229 0.0325 310
2.290 2.290 81 60 98 73 112 84 0.0351 185 0.0262 250
2.710 2.710 77 58 94 70 108 80 0.0337 177 0.0251 240
Min/max engine speed: 400/5500 rpm

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LIGHT DUTY CLASSIFICATION
MODEL RATIOS MAXIMUM INPUT POWER
"A" "B" 2100 rpm 2500 rpm 2800 rpm HP/rpm ft.lb kW/rpm Nm
HP kW HP kW HP kW
ZF 25 A
(HSW 250 A)		 1.550
1.930
2.290		 1.550
1.930
2.290		 70 52 83 62 93 70 0.0334 175 0.0249 238
2.710 2.710 67 50 80 60 90 67 0.0321 168 0.0239 228
Min/max engine speed: 400/5500 rpm

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MEDIUM DUTY CLASSIFICATION
MODEL RATIOS MAXIMUM INPUT POWER
"A" "B" 2100 rpm 2500 rpm 2800 rpm HP/rpm ft.lb kW/rpm Nm
HP kW HP kW HP kW
ZF 25 A
(HSW 250 A)		 1.550
1.930
2.290		 1.550
1.930
2.290		 60 45 71 53 80 59 0.0284 149 0.0212 202
2.710 2.710 57 43 68 51 76 57 0.0272 143 0.0203 194
Min/max engine speed: 400/5500 rpm

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CONTINUOUS DUTY CLASSIFICATION
MODEL RATIOS MAXIMUM INPUT POWER
"A" "B" 1800 rpm 2100 rpm 2400 rpm HP/rpm ft.lb kW/rpm Nm
HP kW HP kW HP kW
ZF 25 A
(HSW 250 A)		 1.550
1.930
2.290		 1.550
1.930
2.290		 42 31 48 36 55 41 0.0231 121 0.0172 164
2.710 2.710 40 30 47 35 53 40 0.0223 117 0.0166 159
Min/max engine speed: 400/5500 rpm

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