Groundsmaster 3500--D Hydraulic System (Rev. D)Page 4 -- 49
Procedure for Deck Motor Efficiency -- Case Drain
Test:
1. Make sure hydraulic oil is at normal operating tem-
perature by operating the machine for approximately 10
minutes. Make sure the hydraulic tank is full.
2. Remove blades from all cutting decks. Lower the cut-
ting units.
3. Park the machine on a level surface with the cutting
units raised and off. Make sure engine is off and the
parking brake is engaged.
4. Read Precautions for Hydraulic Testing.
Note: The deck motors are connected in series. To
isolate a faulty motor, you may have to test all three mo-
tors in the circuit by starting with the upstream motor
first.
5. For the suspected bad deck motor, disconnect return
hose from the motor. Note: the return hose is on the mo-
tor side that includes the relief valve (Fig. 32).
6. Install hydraulic tester (pressure and flow) in series
with the motor and the disconnected return hose. Make
sure the tester flow control valve is fully open.
7. Disconnect hose from deck motor case drain at the
bulkhead T--fitting (Fig. 33). Plug the T--fitting. Place
open end of disconnected case drain hose into a drain
pan.
8. One person s hould sit on the seat and operate the
machine while another person reads the tester and
measures deck motor case drain leakage. Make sure
traction pedal is in NEUTRAL. Start engine and move
the throttle to full speed (3050 +
50 RPM).
CAUTION
Keep away from decks during test to prevent per-
sonal injury from rotating parts.
9. Engage decks by positioning the PTO switch to the
ENGAGE position. While watching hydraulic tester
pressure gauge, slowly close flow control valve until a
pressure of 1200 PSI is obtained.
10.After achieving 1200 PSI, place disconnected motor
case drain hose into a container graduated in ounces or
milliliters (e.g. Toro #TOR4077) and collect hydraulic
fluid for 15 seconds. After 15 seconds, remove hose end
from container.
11.Stop cutting units by positioning the PTO switch to
the DISENGAGE position. Stop engine.
12.Identify amount of oil collected in the container. Re-
cord test results.
13.If flow was greater than 22.4 ounces (662 millili-
ters), repair or replace the tested deck motor.
14.Relieve hydraulic system pressure (See Relieving
Hydraulic System Pressure in the General Information
section). D isconnect tester from motor and hose. Re-
connect hydraulic hoses.
15.Repeat test with other deck motors as needed.
16.Install cutting blades after testing is completed (see
Cutting Unit Operator’s Manual).
1. Deck motor
2. Return line
3. Relief valve
4. Case drain hose
Figure 32
4
1
2
3
1. Deck motor
2. Rear case drain hose
3. Rear T--fitting
4. Front LH case drain
5. Front RH case drain
6. Front T--fitting
Figure 33
2
1
6
5
4
1
3
FRONT
RIGHT
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