Textron Jacobsen Super LF 1880 Fairway Mower with ROPS, Service & Repair Instructions

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HYDRAULICS
8N-45
SECTION 8N. HYDRAULIC FIELD TEST PROCEDURES
GENERAL
When a hydraulic failure occurs, some simple, effective
tests can be performed prior to using a test instrument.
The results of these tests can lead you to the sus-
pected component failure. More extensive test proce-
dures, using test instruments, are presented in
Section 8O. Component location illustrations, hydraulic
schematics and diagrams are presented in Section 8P.
Before performing any tests see Preliminary Checks-
below.
AS A SAFETY REMINDER
• Follow the procedures one step at a time.
• Observe all NOTES, CAUTIONS, and WARNINGS.
• Pay attention to what you are doing. Work with a
safety conscious attitude.
• Use care when working with HOT oil.
• Wear safety glasses at all times.
• Keep hands and feet away from the mower blades.
• The engine must be shut off and the attachments
lowered to the grounded when making adjustments
or hydraulic connections unless otherwise specified
in the test instructions.
PRELIMINARY CHECKS
The following checks should be made before perform-
ing any tests.
1. The reservoir should be checked for proper level,
the presence of water (noted by cloudy or milky
appearance), air (noted by a foaming appear-
ance), or a rancid odor indicating excessive heat.
If any of the above symptoms appear, or if the
hydraulic oil becomes contaminated, or after a
major component failure, the system should be
flushed, the oil changed, and a new filter installed.
NOTE:
Use only the recommended hydraulic oil (see
Section 11). Always change the filter when chang-
ing the oil.
The filter should be changed after the initial 25
hours of operation. Thereafter, the filter should be
changed approximately every 250 hours.
2. Check all lines and fittings for leakage and tighten
as necessary (see Section 8C).
3. Eliminate all possible mechanical problems before
starting the hydraulic tests.
HYDROSTATIC CHARGE PUMP
TEST
The charge pump supplies oil pressure for power steer-
ing and charging the hydrostat for traction.
If faults exist in both systems proceed with an instru-
ment test for the charge pump.
If a fault exists in steering, proceed with an instrument
test, Section 8O.
If a fault exists in lift or lower, proceed with Lift/Lower
Test.
HYDROSTATIC TRACTION SYSTEM
TEST
NOTE:
Before performing test, be sure tow valve, located
on the bottom of the traction pump is closed
(Figure 8N-1).
1. Operate the mower until hydraulic oil is at operat-
ing temperature, 110 – 130
°
F (43 – 54
°
C).
2. Chain the mower to a stationary object, such as a
tree or pole, on concrete or asphalt.
3. With the throttle wide open, in two wheel drive,
and reels lowered, push the traction pedal for-
ward.
8N