Jinma Tractor Introductory User Guide July 2007 Page 24
Generic Mower Attachment and Operation
A mower deck attachment will be connected at the rear of the tractor to the PTO to provide power for the
mowing blades to spin and attached to the 3-Point Hitch to raise it and lower it into operating position.
Assuming the PTO and 3-Point Hitch connections have been made, then there are some fine tuning checks and
adjustments to be made. The goal is to have a mower deck which will operate correctly when towed behind the
tractor and still allow the tractor and mower to negotiate turns and uneven ground.
The first step is getting the mower level. If your mower has 4 wheels (2 front and 2 back), then the wheels will
entirely control height of the mower deck. Setting the 3-Point Hitch so that it is in “Floating Control” (see
below) may be the best approach. If your mower has only 1 wheel at the rear (some have 2 wheels in the rear),
then you need to be sure that the mower deck is level front-to-back when the 3-Point Hitch has been lowered to
the lowest position (where the stopper is set). Adjust the stopper to achieve a level mower deck.
A mower should also be level from side-to-side. Check this by bending down and looking over the deck at the
rear axle of the tractor. If it is not level, adjust one or both of the lower 3-Point Hitch arms until the deck is
parallel to the axle.
The mower should also be able to traverse uneven ground (dips and rises) without pulling part of the mower off
the ground or pushing is too close to the ground. You need to adjust the upper link of the 3-Point Hitch so that
there is some flex of the mower deck, but also limit the amount of slack so that you can raise the rear of the
mower off the ground with some clearance. In other words when the 3-Point Hitch is fully raised, the mower
deck should clear the ground by a foot at both front and back.
The Sway/Check chains on the 3-Point Hitch should be reasonably tight to assure that the mower follows
straight behind the tractor and doesn’t sway or hit the rear wheels when the tractor is turned. This control over
deflection of the mower is especially important if you are backing the mower so that you don’t run over it.. At
the same time the Sway/Check chains should not be too tight; they should be swinging loosely when in
operating mode and should not lift the mower or should not be going taught as the tractor and mower go over
uneven ground.
Floating Control:
In floating control, the supporting wheels control the mower height and the “Floating
Control” keeps the mower on the ground even with uneven terrain. During mowing, hold the Hydraulic Control
Lever at the "lowering" position (i.e. push the control lever of distributor forward with the return stopper. Do not
return the control lever to the neutral position). The hydraulic circuit is then in "floating" control. Using floating
control, the mowing depth is controlled by the change in height of the supporting wheels. This is not suitable
for two wheel mower decks. The 3 point lever will stay in the “floating” position until it is manually moved.
After doing all the alignment and height adjustments and before starting the tractor, check that the PTO shaft has
the appropriate spacing and is free to rotate, but will not fall off.
Before starting the tractor, clutch and shift the PTO to N (neutral). Start the tractor, clutch, and raise 3-Point
Hitch and the mower deck using the Hydraulic Control Lever. Depress the clutch pedal fully then shift the drive
gears into neutral and shift the PTO control lever to the 540 RPM (engaged) position. While remaining in
neutral gear, release the clutch pedal slowly and the PTO drive shaft will begin operating the cutting blades. If
the linkages from the PTO appear to still be in correct spacing run the PTO at higher speeds to assure proper
operation continues. With the PTO in neutral and the 3-Point Hitch raised, proceed to the mowing area. Lower
the 3-Point Hitch and attachment to working level. Put the PTO Lever to 540 RPM and put tractor into gear and
proceed forward. In mowing you will want to set the Hand Throttle to keep the cutting blades at an appropriate
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