Power Steering; Safety Frame (Rops); Tightening Torque Of Bolts And Nuts - Yanmar EF393T Operator's Manual

17. Power steering

This tractor is equipped with hydrostatic powered steering
system.
The hydraulic power assists steering works only when the
engine is running. The steering wheel may become a
little heavier at low engine speeds
WARNING
Whenever the engine is running, steering wheel turns with
light force. Avoid from abrupt steering or it may cause
uncontrollable steering and may cause accident or injury.
IMPORTANT
1) When the steering wheel is turned to its end, the relief
valve works and chirp sound comes out. If relief valve
works in a short time, it is not a problem but long time
work of valve may cause trouble in the hydraulic
system.
2) When tractor dose not run, do not turn steering wheel
as much as possible. It may cause damage on tires
or rims.

18. Safety frame (ROPS)

The safety frame is designed to protect the driver from
an accident. Never fail to use the safety frame when
the tractor is in use.
WARNING
 Always fasten the seat belt while operating the tractor
with Roll-over Protective Structure up.
 Do not use the seat belt if the foldable Roll-over
Protective Structure (ROPS) is in the folded position or
the tractor does not have the ROPS.
 Do not modify the safety frame. Safety factor can be
lost.
 Damaged frame should be replaced as a complete set.
Partial repair may lead loss of safety level.

19. Tightening torque of bolts and nuts

Bolts and nuts being used on this tractor are of grade "7T"
unless otherwise grade is not specified in this manual.
Tighten torques show on right table.
Bolt size
(mm)
M6
M8
M10
M12
M14
M16
M18
M20
45
Grade 7T
(N-m) (kgf-m)
8 - 12 0.8 - 1.2
23 - 30 2.3 - 3.0
44 - 59 4.5 - 6.0
78 - 98 8.0 - 10.0
118 - 147 12.0 - 15.0
167 - 206 17.0 - 21.0
235 - 284 24.0 - 29.0
323 - 402 33.0 - 41.0
EF393T OM