Leakage Test - Toro Reelmaster 7000-D Service Manual

Traction Circuit − Front Wheel Motor Case Drain

Leakage Test

Front wheel motor efficiency is one of tests recommen-
ded to determine traction circuit performance. Over a
period of time, a wheel motor can wear internally. A worn
motor will bypass oil to its case drain causing the motor
to be less efficient. Eventually, enough fluid bypass will
cause the motor to stall under heavy load conditions.
Continued operation can generate excessive heat,
cause damage to seals and other components in the hy-
draulic system, and affect overall machine performance.
The front wheel motors used on the Reelmaster 7000−D
are 2−position (dual displacement) motors. The motors
have a larger displacement/lower operating pressure
when set to LOW speed (mow), and a smaller displace-
ment/higher operating pressure when set to HIGH
speed (transport) Test each motor individually while set
to HI (transport) speed.
Special Equipment Required:
S Pressure Gauge − 10,000 PSI (700 bar) with
hose
S Hydraulic Hose − 13/16 − 16 x 6 ft (1.8 m)
S Hydraulic Cap − 13/16 − 16
S Hydraulic Plug − 13/16 − 16
S Phototach (non−contact tachometer) for units
with Kubota diesel engine
1. Park machine on a level surface with the cutting units
lowered and the reel enable/disable switch is in the DIS-
ABLE position. Set the mow speed limiter to HI (trans-
port) speed, turn the engine is off, and set the parking
brake.
CAUTION
Prevent personal injury and/or damage to equip-
ment. Read all WARNINGS, CAUTIONS and Pre-
cautions for Hydraulic Testing at the beginning
of this section.
2. Locate traction circuit test port for FORWARD opera-
tion. Test ports are located on hydraulic lines near the
right front wheel motor (Fig. 34). Forward traction test
port faces the front.
3. Connect a 10,000 PSI (700 bar) pressure gauge to
traction circuit test port for FORWARD operation. The
pressure gauge hydraulic hose must be long enough to
safely view the pressure gauge while sitting in the opera-
tor's seat.
Reelmaster 7000−D
1
1. FORWARD test port
4. Attach a heavy chain to the rear of the machine frame
and an immovable object to prevent the machine from
moving during testing.
5. Chock the wheels to prevent wheel rotation during
testing.
6. Start engine and set throttle to full speed.
A. Use the InfoCenter display to verify engine RPM
on units with Yanmar diesel engines (2850 RPM).
B. Use a phototach to verify engine RPM on units
with Kubota diesel engines (2850 +50/−120 RPM).
7. Make sure hydraulic oil is at normal operating tem-
perature by operating the machine for approximately ten
(10) minutes. Make sure the hydraulic tank is full.
8. Stop the engine and disconnect the motor case drain
at the appropriate location (Fig. 35):
A. Right Front Wheel Motor: disconnect the case
drain tube from the straight fitting at motor port L2
and install a 6 ft (1.8 m) hydraulic hose to the fitting.
Install a hydraulic plug in the disconnected tube.
B. Left Front Wheel Motor: disconnect the two (2)
case drain tubes from the tee fitting at motor port L2.
Install a 6 ft (1.8 m) hydraulic hose to either tee fitting
post and install a hydraulic cap on the other. Install
hydraulic plugs in the disconnected tubes.
9. Place open end of the case drain test hose into a
drain pan.
10.Two people are required to complete the following
steps. One person should sit in the operator's seat and
operate the machine while another person measures
motor case drain volume.
11. Sit in the operator's seat, start the engine and set the
throttle to high idle speed.
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2
FRONT
RIGHT
Figure 34
2. REVERSE test port
Hydraulic System