The Traction Relief Valve Pressure Test should be per-
formed if a traction circuit problem is identified. This test
will determine if a transmission relief valve is operating
correctly.
7. Start engine and run at low idle speed (1500 to 1650
RPM). Check for any hydraulic leakage from test con-
nections and correct before proceeding with test.
IMPORTANT: Do not run engine at full speed when
performing this test using Toro Hydraulic Tester
(Pressure and Flow) (TOR214678). Traction pump
output at full engine speed can damage hydraulic
tester.
Procedure for Traction Relief Valve Pressure Test:
1.
perature. Also, make sure that traction drive is correctly
adjusted for the neutral position.
Make sure hydraulic oil is at normal operating tem-
8.
throttle so engine speed is 2800 RPM (not full speed).
Using a phototac to measure engine speed, move
WARNING
9.
Completely close flow control valve on tester.
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.
10.Leave traction control lever for transmission pump
not being tested in the neutral position.
11.
While carefully monitoring tester pressure gauge,
have operator slowly push traction lever for pump being
tested (right side or left side) in direction being tested
(forward or reverse) until pressure gauge stabilizes indi-
cating that the relief valve has opened. Pressure gauge
should read approximately 4000 PSI (276 bar) as relief
valve lifts.
2.
Park machine on a level surface with the cutting deck
(or implement) lowered and off. Make sure engine is off
and that the parking brake is not applied.
3.
Read Precautions for Hydraulic Testing listed at the
beginning of this section.
12.Release
traction lever to the neutral position, open
tester flow control valve and stop engine. Record test re-
sults.
4.
traction circuit hoses on top of transmission (Fig. 17).
Determine which traction relief valve is to be tested.
Thoroughly clean transmission area surrounding
NOTE: The forward relief valves for the two (2) trans-
mission pump circuits are identical and thus can be in-
terchanged. The reverse relief valves are also identical.
The forward relief valves, however, are different than the
reverse relief valves so do not interchange forward and
reverse relief valves.
5.
outlet fitting for relief valve to be tested (Fig. 17):
Disconnect hydraulic hose from transmission pump
Relief Valve to be Tested
Right Side Forward
Right Side Reverse
Left Side Forward
Pump Outlet
Port A
13.If
traction relief valve pressure is not met, remove
Port B
and inspect relief valve from transmission (see Trans-
mission Service in the Service and Repairs section of
this chapter). Clean or replace relief valve. Relief valves
are not adjustable.
Port C
Left Side Reverse
Port D
6.
Install hydraulic tester (pressure and flow) in series
14.Relieve
hydraulic system pressure (see Relieving
with the pump outlet and the disconnected hose. Make
sure that the tester flow arrow points from the pump out-
let port and toward the hose for the relief valve direction
that is to be tested. Make sure the flow control valve
on the tester is fully open.
Hydraulic System Pressure in the General Information
section). Disconnect tester from pump outlet fitting and
hydraulic hose. Connect hose to pump fitting.
15.If
necessary, repeat pressure test for other traction
relief valves.
Groundsmaster 7200/7210
Page 4 – 31
Hydraulic System
| Categories | Lawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals |
|---|---|
| Tags | Toro Groundsmaster 7200, Toro Groundsmaster 7210 |
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|
| Document Type | Service Manual |
| Language | English |
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My mower is a TORO 7210.
Start fuse defection. Why ?