Figure 3-2: Compressor cooling and lubrication system
1. Fluid cooler 4. Fluid filter
2. Compressor 5. Receiver tank
3. Thermal valve
185 T4F Kubota User Manual 3: Description
02250216-781 R02
Subject to EAR, ECCN EAR99 and related export control restrictions. 21
fluid reservoir. At start-up, fluid flows from the receiver
tank to the fluid thermal valve. Fluid circulation is
achieved by forcing the fluid from the high pressure
region of the receiver tank to a lower pressure area in the
compressor unit. A minimum pressure device (See
Sec-
tion 3.5: Compressor discharge system, functional
description on page
21) is provided to assure adequate
fluid flow under all conditions. When entering the thermal
valve upon star
t-up, the fluid temperature is cool and thus
it is not necessary to route it through the cooler. The fluid
flows through the fluid filter and on to the compressor unit
bypassing the cooler. As the compressor continues to
operate, the temperature of the fluid rises and the ther-
mostatic control opens, allowing a portion of the fluid into
th
e coole
r.
When the temperature reaches 160°F (71°C), the ther-
mostat is fully open allowing all fluid entering the thermal
valve to flow to the cooler
.
The cooler is a radiator type that works in co
ncert with
the engine fan. The fan pushes air through the cooler
removing the heat from the fluid. From the cooler, the
fluid is then routed back through the fluid filter. All fluid
flowing to the compressor unit passes through this filter.
The fluid leaving the filter flows to the compressor unit
where it lubricates, seals and cools the compression
chamber; and lubricates the bearings and gears.
3.5 Compressor discharge system,
functional description
Refer to Figure 3-2 on page 21. The Sullair compressor
unit discharges a compressed air/fluid
mixture into the
receiver tank. The receiver tank has three functions:
• It acts as a primary fluid separator.
• Serves as
the compressor fluid reservoir.
• Houses the air/fluid separator.
The compressed air/fluid mixture enters the receiver tank
and is dire
cted against its side. Because of a change of
direction and reduction of velocity, large droplets of fluid
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