Power Steering; Safety Frame (Rops) (Optional Equipment); Tightening Torque Of Bolts And Nuts - Yanmar EF312T 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.
become a little heavier at low engine speeds
WARNING
Whenever the engine is running, steering wheel turns
with very 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) (Optional equipment)

The safety frame (ROPS, Roll Over Protect Structure)
is designed to protect operator from an accident such
overturn. It is suggested to install safety frame for
safety operation. Please contact Yanmar tractor
dealer nearby.
WARNING
1) Do not modify the safety frame. Safety factor can be
lost.
2) Be sure the safety frame is installed and tightened
firmly. Check loosened bolt and nut and tightened if
loosened.
3) Damaged frame should be replaced as a complete
set. Partial repair may lead loss of safety level and
it may cause serious injury or death.

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.
The steering wheel may
(A) Safety frame (Optional equipment)
Bolt size
(mm)
M6
M8
M10
M12
M14
M16
M18
M20
44
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
OPE_EF312T&352T_en.doc