FAQ Tightening torques for screws on Zetor tractors

[Joachim]

Torque / tightening torque for Zetor tractors

Please select the values that match your model!
All information provided without guarantee!

Zetor 15 - 25
(all information without guarantee! Conversion kgm/Nm: 1kgm/kpm = 9.8 Nm)

Motor:

Cylinder head nuts: 140 - 150 Nm​

Wear as follows: (from No. 1 to No. ​

5 3 2 8​

front - back

7 1 4 6​

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Connecting rod bearing bolts: 100 - 110 Nm​

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Crankshaft balancers: 98 - 117 Nm​

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For more values see the bottom at the end!​

Zetor Super / 50 Super
(all information without guarantee! Conversion kgm/Nm: 1kgm/kpm = 9.8 Nm)

Motor:

Stud bolts for cylinder heads, stud screws in the engine block: preload with 80 Nm​

(according to RHBForttritt ZT, tip from @Dettl )​

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Cylinder head nuts: 180 - 200 Nm according to BdA​

Tighten crosswise from the middle to the front/back!​

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Connecting rod bearing bolts: 147 Nm​

Screws on the counterweight of the crankshaft: 35-40 Nm​

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Crankshaft main bearing bolts: 180 - 200 Nm​

Zetor UR1 2011 to 7341(1962 to 199
(all information without guarantee! Conversion kgm/Nm: 1kgm/kpm = 9.8 Nm)

General default values from Zetor for the UR1 tractors:

Source: Zetor UR1 Series 1979 Engine Manual / Zetor, Motorkov


Motor:

• Stud bolts for cylinder heads(12 or 16 pcs.)
  • M14x2 approx. 70 Nm (2011-5511)
  • M16x1.5 approx. 80-90 Nm (4711-7745)
• Cylinder head nuts:
  • Zetor 2011-4511 (M14x2 stud bolts) 118 Nm
    to vehicle identification number (FIN):
    2511 to VIN 23175
    3511 to VIN 89420
    4511 to VIN 53537
    5511 to VIN 24349
  • Zetor 2511-5611 (M16x1.5 stud bolts) 150-160 Nm
    2511 from VIN 23176
    3511 from VIN 89421
    4511 from VIN 53538
    5511 from VIN 24350
    5611 from VIN 1001
  • Zetor 4712 and newer (M16x1.5 stud bolts) 168 - 178 Nm
    
    Attention - pay attention to the tightening sequence! (crosswise, cold engine, then let the engine warm up and let it cool down again and then tighten again when the engine is cold)
    
• Connecting rod bearing bolts: 80 - 90 Nm
• Nut for main bearing bolts: 103-118 Nm
• Crankshaft balance weights: 35 - 40 Nm (secure with locking plate AND liquid fuse!)
• Crankshaft pulley: 225 - 275 Nm depending on the model
• Flywheel mounting screws: 108-118 Nm
• Alternator pulley: 40 - 50 Nm

Wheel, axle, front axle console (front):

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2x2 tractors​

(2011 to 7321)​

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4x4 tractors with Zetor all-wheel drive axle (with cast star)​

(e.g. 5945, 6945, 6045, 7045, 6245, 7245, 7745,...) with orig. Zetor front axle​

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4x4 tractors with Cararro all-wheel drive axle​

(e.g. 5245, 3340, 4340, 5340, 6340, 7340, 7341)​

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Wheel, rear portal axle:

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Portal pivoting/height adjustment (field, care, vineyard):​

2011: 50 - 60 Nm M14x1.5 according to BdA ​

3011 - 4011: 70 - 80 Nm M14x1.5 according to BdA​

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Steering:

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elastic coupling of the steering column (from Zetor 5211):​

5211 bis 7745: 14 - 15 Nm​

General DIN ISO 898 standard values for screws and nuts
For all models if there is no factory default


Important:

The smaller value is for threads that are slightly oily (less friction = less torque required) and the higher value for dry assembly (more friction = more torque required). ​

Furthermore, all values here are only recommendations. I assume no liability for damage - if in doubt, consult the manual or the workshop!​

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Other sources for tightening values:​

- Tightening torques of metric screws (external link)​