Toro 07150SL Groundsmaster 7200 7210 Service Manual

The Charge Relief Valve Pressure Test should be per-
formed if a traction circuit problem is identified. This test
will determine if the transmission charge relief valve  is
operating correctly.
C. The  charge  pump in  the transmission  is faulty
(PTO operation would also be affected. See Trans-
mission Service in the Service and Repairs section).
12.A dynamic charge pressure test can be performed as
follows:
Procedure for Charge Relief Valve Pressure Test:
1.
perature.
Make sure hydraulic oil is at normal operating  tem-
A.  With hydraulic pressure gauge still connected, sit
in the operator seat and move the traction levers to
forward.
2.
Make sure that traction drive is correctly adjusted for
the neutral position.
B.  While machine  is  moving,  monitor the  charge
pressure reading on the pressure gauge.
WARNING
C. The  charge pressure should drop no more than
15%
from initial test reading (Step 10 above) as the
machine is moving (e.g. if initial charge pressure was
100 PSI (6.9 bar), charge pressure while machine is
moving should be above 85 PSI (5.9 bar)).
Before disconnecting or performing any work  on
the hydraulic system,  all pressure in  the system
must be relieved. See Relieving Hydraulic System
Pressure in the General Information section.
D. A  pressure drop  of more than  15% indicates a
traction  circuit  leak  (e.g.  a  leaking   transmission
check valve,  a worn/damaged transmission  piston
pump). If charge pressure is good under no load, but
drops below specification when under traction load,
the  transmission  piston  pump(s)  should  be  sus-
pected of wear or damage. When a pump is worn or
damaged, the charge  pump is not able to  keep up
with internal leakage in the traction circuit.
3.
Park machine on a level surface with the cutting deck
(or implement)  lowered and  off. Apply parking  brake.
Make sure engine is off.
4.
Read Precautions for Hydraulic Testing listed at the
beginning of this section.
5.
charge pressure test port on right side of  transmission
(Fig. 15).
Thoroughly  clean  transmission  area  surrounding
13.Stop
machine and shut off engine.
14.Relieve
hydraulic system  pressure  (see Relieving
Hydraulic System Pressure in the General Information
section).  Remove pressure  gauge from  transmission
charge  pressure test  port.  Install  plug  into port  and
torque plug from 13 to 15 ft–lb (17.7 to 21.5 N–m).
6.
15).
bar) with an attached hydraulic hose to the transmission
charge pressure port.
Remove plug  from charge pressure  test port  (Fig.
Connect hydraulic pressure gauge (1000 PSI / 70
7.
locked position and that the parking brake is applied.
Make  sure that  traction  levers  are in  the  neutral
8.
RPM). Check for any hydraulic  leakage from test con-
Start engine and run at low idle speed (1500 to 1650
nections and correct before proceeding with test.
9.
(3200
With  engine  running,  move throttle  to  full  speed
RPM).
FRONT
10.Pressure
gauge should read from 70 to 100 PSI (4.8
to 6.9 bar). Record test result.
11.
If charge  relief  pressure specification  is not   met,
consider the following:
Charge Pressure
Test Port
A.  The transmission charge relief valve is faulty. Re-
pair or replace the charge relief valve (see Transmis-
sion Service in the Service and Repairs section).
Figure 15
B.  A transmission  traction  relief valve  or  flushing
valve is leaking or damaged (see Transmission Ser-
vice in the Service and Repairs section).
Groundsmaster 7200/7210
Page 4 – 27
Hydraulic System
Product Specification
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- 226 pages
Document TypeService Manual
LanguageEnglish
Product BrandToro. Customer Service Representatives are available by phone: Monday - Friday 7:30 a.m. to 9:00 p.m. (CDT) - Saturday 8:00 a.m. to 8:00 p.m. (CDT) - Sunday 10:00 a.m. to 8:00 p.m. (CDT)
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