Testing Hydraulic System - Bolens QS Series Service Manual

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HYDRAUliC SYSTEM (Continued)
OS, QT & 1900 SERIES
TRACTORS
Page 6-3 REV. 4/83
TESTING HYDRAULIC SYSTEM
EATON MODELS
The hydrostatic and lift pressure
can be checked using a pressure
gauge which reads at least 1000
P .S.I. (6890 kPa).
To check the hydrostatic pressure
install a tee hydraulic fitting be·
tween hydrostatic port (A) Figure
6·2 and existing hydraulic tube.
Connect pressure gauge to
hydraulic tee. Start engine and run
for 5-10 minutes. At full RPM the
pressure reading should be 140
P.S.I.
±
50 (964 kPa).
To check the lift pressure, move
the hydraulic control valve lever to
the lift position until the hydraulic
cylinder reaches the end of its
travel. The pressure reading
should be no less than 450 P.S.I.
(3100 kPa).
If the pressure reading is 450 to
550 P.S.I. (3100- 3790 kPa) and
the hydraulic cylinder does not
operate properly, check the fol-
lowing:
1. Load too heavy.
2. Restriction in line from
hydro to hydraulic cylinder.
3. Malfunctioning cylinder or
valve.
If the pressure reading is below
450 to 500 P.S.I. (3100- 3790
kPa) and the hydraulic cylinder
does not operate, check the fol-
lowing:
1. System low on oil.
2. Plugged oil filter or pickup
tube line.
3. Hydraulic oil line leaking.
4. Hydraulic valve or cylinder
leaking.