Zoomlion ZRT850, Operator'S Manual

Page: 48 / 179

Op
erat
ing
co
nd
itio
ns and
po
int
s f
or at
te
nt
ion
Operator’s Manual for Rough Terrain Crane

Sounds or smells

Vibrations

Sudden speed increase or decrease.
If you cannot find or correct the problem, send the vehicle for repair.
D. Examine the following instruments for functions:
CAUTION
Stop the engine if the engine oil pressure low indicator illuminates.
CAUTION
The engine oil pressure low indicator illuminates if the engine oil filter screen is
dirty. If this occurs, examine the engine oil pressure. If it is in the correct pressure
range, examine and clean the engine oil filter screen.
(1) Engine oil pressure low indicator:
(a) Not illuminated.
(b) When the engine runs at idle, the minimum oil pressure is 55.1 psi (0.38 MPa).
When the engine runs without a load, the minimum oil pressure is 10 psi (0.069
MPa). If the pressure is less than the minimum value, the indicator illuminates. If
this occurs, stop the engine. Measure the level of the oil in the engine and
examine for leaks. If the oil level is at the correct level and there are no leaks, it is
an unserviceable lubricating system. Send the crane to the factory for repair.
(2) Engine coolant temperature gauge:
(a) The coolant temperature must be between 158°F and 203°F (70°C and 95°C).
Do not move the crane at high speed when the coolant temperature is less than
158°F (70°C).
(b) Do not operate the engine at high speeds without a load for extended periods of
time.
CAUTION
Do not move the crane at high speeds with a heavy load until the engine
coolant temperature is a minimum 158°F (70°C).
(c) When the coolant temperature is in the yellow area, between 203
°
F and 212
°
F
(95
°
C – 100
°
C), the engine is too hot. Park the crane. Operate the engine at a
RPM immediately above idle to help cool the engine. Or, as you move, put the
transmission in a lower gear range to decrease the load on the engine.
5-6