Yanmar YM2000 Service Manual

2. Nomenclature of the hydraulic system
Stop valve
The stop valve prevents high-pressure fluid from
flawing backwards from the cylinder.
* Relief valve
The relief valve operates whenever the pressure in
the cylinder exceeds the specified pressure.
Slow-return valve
The slow-return valve controls the volume of flow
of the hydraulic fluid from the cylinder to the re-
servoir.
Stop valve
Slow-return valve
Notes:
m The hydraulic device employs high precision
parts, so if the hydraulic fluid is dirty or contains
foreign matter, the efficiency of the device will
be greatly impaired.
When assembling or disassembling the hydraulic
device, always follow the procedure described
in the service manual.
a Before operating, always check the level of the
hydraulic fluid. If it is low, tefill to the level
marked on the dipstick.
The hydraulic fluid is supplied from the same
reservoir to both the transmission and the hy-
draulic device.
Always
use "John Deese Type 303" hydraulic
fluid or its equivalent.
Relief valve
Hydraulic pump

Yanmar YM2000 Specifications

General

Engine Type	Diesel
Horsepower	20 HP
Type	Compact Utility Tractor
Cooling	Liquid-cooled
Drive	2WD
Hydraulic System	Open center
PTO Speed	540 RPM
Transmission Gears	6 forward, 2 reverse
PTO Power	18 hp
Weight	1, 300 kg