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Hydraulic Settings
Refer to the Hydraulic Safety section for precautions regarding the hydraulic system. The Model JH7020
Leveling System uses an auxiliary gear pump and single-station manifold for its leveling and a separate
header trim manifold. The Model JH9020 Leveling System uses hydraulic flow from the closed center
hydraulics of the combine. If the combine was not originally equipped with Contour Master then a
dual station manifold is installed controlling leveling and header trim. If the combine is equipped with
Contour Master then a single station manifold controls the leveling and the John Deere Contour Master
manifold controls header tilt. Consult your combine's operator's manual or contact your John Deere
dealer for diagnostic and maintenance support regarding the hydraulic system.
Notice
Hydraulic Hoses
Inspect the hydraulic system for leaks, damaged hoses, improper routing, and loose fittings. Hydraulic
hoses that are not routed correctly could become worn from working against abrasive edges or moving
parts. If abrasions or holes do occur, the hydraulic hoses can only be replaced, not repaired. Do not
attempt repairs with tape or cements. High pressure will burst such repairs and cause system failure
and possible injury.
Hydraulic Hose Connections – When tightening loose hoses on the cylinders, pump, etc., always use
one wrench to keep the hose from twisting and another wrench to tighten the union. Excessive twisting
will shorten hose life and allow the fitting to loosen during operation. Do not over-tighten fittings or
adapters.
Refer to the John Deere® Combine's Operators Manual for information regarding hydraulic oil, check
intervals, and reservoir fluid levels. High speed leveling, low speed leveling and header trim speeds are
preset at the factory. If different speeds are desired please contact your Hillco dealer.
Hydraulic Cylinder
Each leveling cylinder is equipped with a safety valve (counterbalance valve) that is
Notice
in place to prevent unintentional leak down of the cylinder. These safety valves are
preset at the factory, and should not be adjusted.
WARNING
D-180215CMA01C
All adjustments on the hydraulic system are preset at the
factory for optimal leveling and header trim performance.
Do not make any adjustments to these settings without first
contacting your authorized Hillco Dealer.
Do not make any repairs to the cylinders, disconnect valves, or disconnect
any hoses connected to the cylinders, counterbalance valves, bulkhead
mount or manifold without first contacting your authorized Hillco dealer. These
hydraulic components stabilize the chassis of the combine. Improper repair or
replacement of these components could lead to uncontrolled leveling of the
combine's chassis. The leveling cylinder safety stops can be used to prevent
accidental tipping of the combine during repair.
Hillco Technologies, Inc.
52
Sept. 2022
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