Oshkosh Corporation IMT CAS80R, Installation, Operation, Maintenance & Parts Manual

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CAS80R SECTION 3: INSTALLATION
Manual # 99905932 (February 2016) PAGE - 11
IOWA MOLD TOOLING CO., INC.
(641) 923-3711 • www.imt.com
®
3.7.1 SUCTION LINE SIZING
Based on the 4 ft/sec fluid velocity condition,
choose a suction hose size from
TABLE 3B.
Upsize the hose, if necessary.
Hose size recommendations for the IMT
CAS80R are:
• Return line size: 1” (one inch)
• Pressure line size: 3/4” (0.75 inch)
3.7.2 RETURN LINE SIZING
Based on the 10 ft/sec fluid velocity
condition, choose a suction hose size from
Table 3C .
3.7.3 PRESSURE LINE SIZING
Based on the 20 ft/sec fluid velocity
condition, choose a suction hose size from
TABLE 3D .
3.8 HYDRAULIC SYSTEM
FILTRATION
IMT recommends using a 10 micron oil filter
on the hydraulic oil return line. Flow rating of
the filter must be equal to, or greater than,
the maximum GPM at which the system will
be operated.
3.9 HYDRAULIC OIL
RESERVOIR
3.9.1 DETERMINING RESERVOIR SIZE
In a conventional hydraulic system, minimum
tank size, in gallons, should be equal to the
maximum GPM flow rate, times two (x 2).
For the CAS80R, a minimum 35 gallon
reservoir is recommended.
3.9.2 DETERMINING RESERVOIR SHAPE
The reservoir structure should be tall and
narrow rather than shallow and broad
(
Figure 3-3
). A tall, narrow tank is
recommended because:
1. The oil level is well above suction line
opening, avoiding the possibility of
drawing air into the pump due to a
vortex or “whirlpool” effect within the
tank during operation flow.
2. Allows for better oil level tolerance
level of the system if vehicle operates
at an unusual (slightly off level) vehicle
angle.
3. To keep return flow well below the
surface so it does not break the surface
and cause aeration (cavitation) of the oil.
3.9.3 MANDATORY RESERVOIR FEATURES
Refer to
Figure 3-3
. The reservoir should
incorporate the following design features:
• In terms of location of the reservoir tank
within the hydraulic system, note that the
TABLE 3B - SIZING FOR SUCTION HOSE
Maximum Operating GPM Suction Hose Size
8-13 1”
14-15 1-1/4”
16-22 1-1/2”
IMPORTANT
Failure to match the correct system return
line sizing for the hydraulic system can
cause rupture of the hydraulic motor’s shaft
seal during cold start-ups.
TABLE 3C - RETURN LINE SIZING
Maximum GPM Return Line Size
8-14 3/4”
15-22 1”
TABLE 3D - PRESSURE LINE SIZING
Maximum GPM Pressure Line Size
8-12 1/2”
13-18 5/8”
19-22 3/4”
IMPORTANT
Use only a filter that is specifically intended
for hydraulic systems.