Progressive Turf Equipment Pro-Flex 120 Troubleshooting

137 West William St.
Box 940 Seaforth, ON
N0K 1W0 Canada
Pro-Flex 120 HYDRAULIC SYSTEM TROUBLE SHOOTING
In total there are seven hydraulic cylinders
used on each Pro-Flex: five to raise and lower
the decks and one for each left and right hand
wing. The only difference between the deck
and wing cylinders is the port location. They
use a common seal kit.
If a user complains about a deck not holding,
the culprit could be that oil is by-passing at the
tractor's control valve, or one of the cylinders
is by-passing internally. The following guide
will help you trouble shoot a deck drifting
complaint. Make sure you refer to the correct
hose configuration for your Pro-Flex.

HYDRAULIC SYSTEM DESIGN

It is normal for the deck(s) to drift down slightly over a period of several hours when placed in a
raised position, without the deck locks securing the decks. This is NOT considered a fault nor should
it impede normal operation.
The 7 hydraulic cylinders used on a Pro Flex are arranged in a PARALLEL circuit. This can make it more
challenging to locate a problem as a fault in one area can show up in a different area.
It is important to know that the front and rear deck lift arms (to which the cylinder mounts) are
different lengths. Therefore, the rear decks (with the longer lift arm) will most often drift down
before a front deck will, regardless of the location of the issue. Additionally, as most Pro-Flex's are
parked with the wings raised and locked, (which removes weight from the outer rear deck cylinders),
the rear center deck will be the first to drift. As a result the center deck cylinder is often incorrectly
deemed to be faulty. Unfortunately this is a characteristic of a parallel hydraulic circuit and why a
systematic approach to diagnosing is required to ensure the true cause of the issue is found.
Pro-Flex 120 HYDRAULIC SYSTEM TROUBLE SHOOTING
www.progressiveturfequip.com
Bus: (519) 527-1080
Fax: (519)527-2275
1-800-668-8873
May 2019
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