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338 REV.990801
RECOMMENDATIONS
HYDRAULIC PRESSURE RELIEF:
The hydraulic circuit for the PULLMASTER Planematic
drive requires a pressure relief set at the operating
pressure (see SPECIFICATIONS). Usually, a pressure
relief is part of the hydraulic control valve. Where this is
not the case, a separate pressure relief valve must be
installed and set at the recommended maximum pressure.
HYDRAULIC RESERVOIR:
It is recommended that the hydraulic reservoir has
sufficient capacity to provide good heat dissipation in
order to prevent over-heating of the hydraulic fluid. The
hydraulic reservoir should be made from clean and
scale-free material to prevent contamination of the
hydraulic fluid. In order to prevent air from being mixed
with the hydraulic fluid, the reservoir should have an
over-flow baffle separating the return lines from the
suction line and all return lines should enter the reservoir
below the fluid level. The reservoir should be mounted
close to and above the hydraulic pump in a location
which provides for free air circulation around the reservoir.
HYDRAULIC HOSES:
The following hydraulic hoses are recommended for
maximum efficiency of the PULLMASTER Planematic
drive:
Pressure lines:
Equivalent to SAE 100R12-20
Circulation return line:
Equivalent to SAE 100R4-12
Circulation supply line:*
Equivalent to SAE 100R6-6
* Only for models with external circulation.
It is recommended that a larger size of hydraulic hose
is installed where the pressure lines or the circulation
lines are excessively long.
HYDRAULIC FILTER:
Hydraulic filter recommendations for the hydraulic circuit
of the PULLMASTER Planematic drive, based on a
return line filter, are given as follows:
Average Atmosphere:
10 microns
Dusty Atmosphere:
5 microns
In order to prevent accidental stoppage of the return
line flow, the oil filter should have a by-pass feature.
HYDRAULIC FLUID:
The hydraulic fluid selected for use with PULLMASTER
Planematic drives should be a high grade, petroleum
based fluid, with rust, oxidation and wear resistance.
Fluid cleanliness and operating viscosity are critical to
drive reliability, efficiency and service life.
For optimum performance, the recommended viscosity
range at operating temperature is 81 - 167 SUS (16 - 36
CS). For extreme operating conditions of short duration,
the maximum viscosity range of 58 - 4635 SUS (10 -
1000 CS) should not be exceeded.
For optimum performance, the drive recommended
hydraulic fluid temperature operating range is 80 -
150F (27 - 66 C). For extreme operating conditions of
short duration, the maximum temperature range of -5 -
180F (-21 - 82 C) should not be exceeded.
LUBRICATION:
The Planematic drive mechanism requires an oil bath
lubrication of the internal components. Depending on
the model code, circulation is supplied internally by the
motor or externally (see TYPICAL HYDRAULIC
CIRCUIT). If the unit is internally circulated, fill the
Planematic with hydraulic oil through one of the filler /
drain ports before operating.
HYDRAULIC PUMP:
For maximum performance of the PULLMASTER
Planematic drive, the hydraulic pump must supply the
maximum flow of hydraulic fluid at the hydraulic pressure
stated in SPECIFICATIONS.
HYDRAULIC CONTROL VALVE:
The standard control valve used for operating the
PULLMASTER Planematic drive must have a four-
way, spring return to neutral feature, which provides for
open flow from the pressure ports of the drive to the
reservoir in neutral position of the control (motor
spool). It is important to point out that good speed
control depends on the "metering" characteristics of
the control valve. The better the oil flow is "metered" the
better will be the speed control.
