Lift Circuit (Raise)
A single section gear pump is directly coupled to the
transmission which is driven by the engine. This gear
pump supplies hydraulic flow for raising and lowering
the cutting deck (or implement). The pump takes its suc-
tion from the hydraulic tank.
Load on the lift cylinder causes lift circuit pressure to in-
crease. If lift circuit pressure reaches implement relief
valve pressure (3000 PSI/207 bar), the relief valve in the
gear pump shifts to allow pump flow to return to the hy-
draulic tank. This condition occurs in both the raise and
lower modes.
During conditions of not raising or lowering the cutting
deck (or implement), flow from the gear pump is by–
passed by the lift control valve directly to the oil cooler
and then to the transmission. Flow then returns to the
hydraulic tank.
When the lift control lever is released from RAISE,
spring action returns the control valve spool to its origi-
nal, centered position, stopping lift cylinder movement.
Gear pump flow is again bypassed through the oil cool-
er, transmission and to the hydraulic tank. The pilot
check valve in the control valve will be reseated to lock
the lift cylinder in place.
When the lift control lever is moved to the RAISE posi-
tion, the control valve spool is shifted. This shifted spool
allows hydraulic flow from the gear pump to the barrel
end of the lift cylinder. At the same time, the pilot check
valve in the lift control valve is unseated. The lift cylinder
extends, causing the cutting deck (or implement) to
raise. The fluid displaced from the rod end of the lift cylin-
der is routed past the unseated pilot check valve, to the
oil cooler, transmission and then to the hydraulic tank.
An orifice fitting at the barrel end of the lift cylinder con-
trols the extending speed of the lift cylinder while raising
the cutting deck (or implement).
Groundsmaster 7200/7210
Page 4 – 13
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 |
| Product Brand | Toro. Customer Service Representatives are available by phone:
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| Document File Type | |
| Publisher | toro.com |
| Wikipedia's Page | Toro Company |
| Copyright | Attribution Non-commercial |
(0 votes, average: 0 out of 5)
My mower is a TORO 7210.
Start fuse defection. Why ?