Lift Circuit (Lower)
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 allowing pump flow to return to the hy-
draulic tank. This condition occurs in both the raise and
lower modes.
Circuit operation for lowering the cutting deck (or imple-
ment) is similar to raising it. However, hydraulic flow is
used to contract the lift cylinder and this action allows the
cutting deck (or implement) to lower.
When the lift control lever is released from LOWER,
spring action returns the spool to its original, centered
position, stopping lift cylinder movement. Gear pump
flow is again bypassed through the oil cooler, transmis-
sion and to the hydraulic tank. The pilot check valve in
the control valve will be reseated to lock the lift cylinder
in place.
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 transmission. Flow then returns to the hydraulic
tank.
When the cutting deck (or implement) is to be lowered,
the lift control valve spool is shifted by moving the lift
control lever to LOWER. This shifted spool allows gear
pump flow to unseat the pilot check valve in the lift con-
trol valve and then to the barrel end of the lift cylinder.
The lift cylinder contracts, causing the cutting deck (or
implement) to lower. The fluid displaced from the barrel
end of the lift cylinder is routed to the oil cooler, transmis-
sion and hydraulic tank. An orifice fitting at the barrel end
of the lift cylinder controls the contracting speed of the
lift cylinder while lowering the cutting deck (or imple-
ment).
Groundsmaster 7200/7210
Page 4 – 15
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 |
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My mower is a TORO 7210.
Start fuse defection. Why ?