Procedure for Deck Motor Efficiency -- Case Drain
Test:
11.Stop cutting units by positioning the PTO switch to
the DISENGAGE position. Stop engine.
1.
perature by operating the machine for approximately 10
minutes. Make sure the hydraulic tank is full.
Make sure hydraulic oil is at normal operating tem-
12.Identify amount of oil collected in the container. Re-
cord test results.
13.If
flow was greater than 22.4 ounces (662 millili-
2.
Removebladesfromallcuttingdecks.Lowerthecut-
ters), repair or replace the tested deck motor.
ting units.
14.Relieve
hydraulic system pressure (See Relieving
3.
units raised and off. Make sure engine is off and the
parking brake is engaged.
Park the machine on a level surface with the cutting
Hydraulic System Pressure in the General Information
section). Disconnect tester from motor and hose. Re-
connect hydraulic hoses.
4.
Read Precautions for Hydraulic Testing.
The deck motors are connected in series. To
15.Repeat test with other deck motors as needed.
Note:
16.Install cutting blades after testing is completed (see
Cutting Unit Operator’s Manual).
isolate a faulty motor, you may have to test all three mo-
tors in the circuit by starting with the upstream motor
first.
4
5.
Forthesuspectedbaddeckmotor,disconnectreturn
hose fromthemotor.Note: the return hose is on the mo-
tor side that includes the relief valve (Fig. 32).
3
6.
with the motor and the disconnected return hose. Make
sure the tester flow control valve is fully open.
Install hydraulic tester (pressure and flow) in series
2
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.
1
Figure 32
1.
2.
Deck motor
Return line
3.
4.
Relief valve
Case drain hose
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).
3
2
CAUTION
6
5
1
Keepawayfromdecksduringtesttopreventper-
sonal injury from rotating parts.
RIGHT
1
9.
Engage decks by positioning the PTO switch to the
FRONT
ENGAGE position. While watching hydraulic tester
pressure gauge, slowly close flow control valve until a
pressure of 1200 PSI is obtained.
4
Figure 33
10.After
achieving 1200 PSI, place disconnected motor
1.
2.
3.
Deck motor
Rear case drain hose
Rear T--fitting
4.
5.
6.
Front LH case drain
Front RH case drain
Front T--fitting
case drain hose into a container graduated in ounces or
milliliters (e.g. Toro #TOR4077) and collect hydraulic
fluidfor15seconds.After15seconds,remove hoseend
from container.
Groundsmaster 3500--D
Page 4 -- 49
Hydraulic System (Rev. D)
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