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4.2 Tractor Requirements
The tractor used to operate the machine must have sufficient capacity to lift, pull and operate the Power Take Off
(PTO) at the machines rated speed (540 or 1000 rpm) while travelling at a working ground speed for the
conditions and quantity of material of the work site. Operating the machine with a tractor which does not meet
the requirements set by McConnel may cause the tractor and/or machine damage, potentially risking danger to
the operator and bystanders.
The working tractor MUST effectively offer the following characteristics to fit any of the SR460/620/820
machines.
Tractor
Requirement (1)
Driver Protection Approved cab (for country of use) with protective structure or Roll Over Protection
Structure (ROPS) and seat belt. See local tractor standards (2)
Safety Devices Slow Moving (SMV) emblem, lighting, PTO master shield. See local tractor standards (3)
Horsepower
Requirement
70hp/52kW (4) 90hp/67kW (4) 150hp/112kW (4)
Drawbar Standard or K80 hitch to meet the requirements of Section 1.5.2.4
Hydraulics 2 double acting hydraulic spool valves
Front End Weights Required in order to maintain the 20% weight required on the front axle (5)
Power Take Off
(PTO)
540 RPM 1” 3/8 6-spline, 1000 RPM 1” 3/8 6-spline or 21-spline, or 1000 RPM 1” ¾ 20-
spline (6); see Section 1.5.2.2
Table 4.1 - Tractor Requirements and Capabilities
Notes:
(1) McConnel constantly reviews and improves product designs and reserve the right to change this
information. Contact your McConnel Sales representative if you have any queries.
(2) The tractor must be fitted with a locally approved cab or Roll Over Protection Structure (ROPS) and
have a seat belt to protect the operator from falling from the tractor or during a rolling over incident.
Only operate the tractor when seated in the operator’s seat with the seat belt securely fastened.
(3) All guarding must be maintained to perfect working condition. Always replace shields and guards
that were removed for access to service or repair the tractor or machine. Never operate
machine/tractor without all safety devices in position.
(4) Variations in power requirement can depend on the vegetation to be cut, terrain condition, operator
experience and the physical condition of the machine and/or tractor. Running a machine on an
overly large tractor may cause damage through overpowering the machine in heavy working
conditions.
(5) Front end weight is critical to maintain steering control and prevent the tractor from rearing up. Front
weight and weight carriers can be purchased through an authorized tractor dealership.
(6) Refer to the tractor owner’s manual for instructions on how to change PTO speeds on models with
more than one speed.
4.3 Connecting & Disconnecting Hydraulic Hoses & Electric Cables
CAUTION! Relieve hydraulic pressure before disconnecting lines or working on the system. This can
be done by pushing and pulling/pushing the selected tractor lever/button. Only once this has been
completed and suitable safety glasses and impenetrable gloves have been put on can the hydraulic
hoses be removed from the tractor.
Connecting
With the tractor switched off and secured in position on level ground, relieve the hydraulic pressure from the
tractor by moving the hydraulic control levers/buttons back and forth several times.
SR460/620/820 machines feature quick release hydraulic couplers and when connecting the hoses to the tractor
it is important to keep the hoses, quick couplers and swivels free of contamination and dirt. If any component is
deemed dirty ensure that it is cleaned with some clean rag before proceeding to fit the hoses. Never disconnect
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