HUSTLER Super S General Service Manual page 23

Test Example: PG/PL or PJ Pump
RESTRICTION VALVE
BI-DIRECTIONAL
FLOW METER
CONNECTIONS TO THE
FWD/RVS LINES DIS-
CONNECTED FROM
WHEEL MOTOR
RESTRICTION VALVE
BI-DIRECTIONAL
FLOW METER
CONNECTIONS TO THE
FWD/RVS LINES DIS-
CONNECTED FROM
WHEEL MOTOR
Purging Procedures
Due to the effects air has on efficiency in hydrostatic drive
applications, it is critical that air is purged from the system.
These purge procedures should be implemented any time a
hydrostatic system has
maintenance or additional oil has been added to the system.
Air creates inefficiency because its compression and
expansion rates are higher than that of oil.
127180
300 psi (21 bar) reading
1100 psi (76 bar) reading
PG/PL or PJ
300 psi (21 bar) reading
1100 psi (76 bar) reading
Subtract the 1st reading from the 2nd.
(In this example, 4 gpm difference would indicate further pump examination).
been opened to facilitate
Entrained air in the oil may cause the following symptoms:
1. Noisy operation.
2. Lack of power or drive after short term operation.
3. High operation temperature and excessive expansion
of oil.
Before starting, make sure the reservoir is at the proper oil
level. If it is not, fill to the vehicle manufacturer's
specifications.
4-11
7 gpm (26 l/min) (1st reading)
3 gpm (11 l/min) (2nd reading)
7 gpm (26 l/min) (1st reading)
-3 gpm (11 l/min) (2nd reading)
4 gpm (15 l/min) (the difference)
REV A