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Groundsmaster 3505--D Hydraulic SystemPage 4 -- 43
Procedure for Deck Motor Efficiency -- Case Drain
Test:
1. Make sure hydraulic oil is at normal operating tem-
perature.
2. Remove blades from all cutting decks (see Cutting
Unit Operator’s Manual).
3. Park machine on a levelsurface with the cuttingunits
lowered and off. Make sure engine is off and the parking
brake is engaged.
4. Read Precautions for Hydraulic Testing.
WARNING
Before disconnecting or performing any work
on the hydraulic system, all pressure in the
system must be relieved. See Relieving Hy-
draulic System Pressure in the General Infor -
mation section.
NOTE: The deck motors are connected in series. To
isolate a faulty motor, all three motors in the cutting cir-
cuit may have to be tested by starting with the upstream
motor first.
5. Forthe suspected baddeck motor, disconnectreturn
hose from the motor. Note: the return hose is on the mo-
tor side that includes the relief valve (Fig. 28).
6. Install hydraulic tester (pressure and flow) in series
with the motor and the disconnected r eturn 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. 29). Plug the T--fitting. Place
open end of disconnected case drain hose into a drain
pan.
8. One person should 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 awayfrom decks duringtest 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 for15 seconds. After15 seconds, removehose 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 28
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 29
2
1
6
5
4
1
3
FRONT
RIGHT
Hydraulic
System