Checking The Refrigerant Pressure; Troubleshooting The Pressure Readings; Washing The Machine And Cab - Toro LT-F3000 Operator's Manual

5. Repeat step 2 to ensure that the belt tension is
correct.
6. Close the hood, and latch it.
Checking the Refrigerant
Pressure
When using the air-conditioning system the operating
pressure is different on the suction (low pressure)
side and the pressure (high pressure) side of the
compressor; refer to Figure
This pressure difference is influenced by the speed
of the compressor, the inside temperature of the
vehicle, the outside air temperature and the relative
air humidity.
Pressures that differ from those in the table below
indicate a possible fault in the system.
To check the pressures, set the compressor speed to
2000 rpm with an air temperature between 20 and
40 degrees C (68 and 104 degrees F). Operate the
blower at position 3 (fastest speed setting).
Figure 38
1. Red cap (high-pressure
port)
System Refrigerant Pressures
Outside Low-Pressure
Side
Temperature
20° C (68° F) 1.7 to 2.1 bar
(24.7 to 30.5 psi)
25° C (77° F) 1.8 to 2.2 bar
(26.1 to 31.9 psi)
1.9 to 2.3 bar
30° C (86° F)
(27.6 to 33.4 psi)
38.
g350689
2. Blue cap (low-pressure
port)
High-Pressure
Side
10 to 14 bar
(145 to 203 psi)
12 to 16 bar
(174 to 232 psi)
14 to 18 bar
(203 to 261 psi)
Troubleshooting the
Pressure Readings
During the compression test, deviations from the
values in the table may be measured. Locating the
cause can determine whether a part requires repair
or replacement.
The following is a short list of some pressure deviation
that may be measured and some possible causes.
•
Pressure on high-pressure manometer too
high
– The air volume in the condenser is too small.
– Refrigerant quantity is too high
– The dryer/filter is blocked.
•
Pressure on high-pressure manometer is too
low
– The refrigerant quantity is too low (check the
sight glass).
– The compressor speed is too low (check the
drive belt for slip/tension).
– There is a fault with the compressor.
•
Pressure on low-pressure manometer too high
– The expansion valve is incorrect.
– The compressor speed is too low (check the
drive belt for slip/tension).
– There is a fault with the compressor.
•
Pressure on low-pressure manometer too low
– There is restriction in the suction or pressure
hoses.
– The expansion valve is incorrect.
– The refrigerant quantity is too low (examine the
sediment bowl).
– The air volume in the evaporator is too small.
Have a qualified person examine and repair all
deviations in pressure from the values in the table.
Important:
Do not allow refrigerant to discharge
into the atmosphere. Before opening or
disconnecting parts from the refrigerant circuit,
empty the refrigerant into a specified recycling
bottle, and dispose of it correctly.
Always use genuine Toro spare parts when repairing
or servicing the air-conditioning system.
Washing the Machine and
Cab
When washing the machine and the cab, do not direct
water into the roof area.
Important:
Do not use brackish or reclaimed
water to clean the machine.
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