CONFIGURATION: PUMPS AND MOTORS
SPECIFICATIONS
Maximum
Max
Model
Displacement
Recommended
Speed
Working
@ Max
Pressure*
Disp
IN3:RE
V
CC
REV
PSI
BAR
(RPM)
20
2 03
33.2
5,000
345
3,800
21
3.15
51.6
5,000
345
3,500
22
4.26
69.8
5.000
345
3,200
23
5 43
89
5.000
345
2,900
24
7 24
118.6
5,000
345
2,700
25
10 12
165.8
5.000
345
2,400
26
13.87
227.3
5.000
345
2,100
27
20.36
333.6
5.000
345
1,900
*6,000 PSI (414 BAR) maximum working pressure with
written approval.
Heavy Duty Series and Types
The Heavy Duty Family of units consists of eight (8)
different frame sizes (20 through 27 Series). Pumps and
motors of different series (displacements) can be
combined to meet the requirements of a variety of
applications.
Within each series of the Heavy Duty Family of units there
are
three
(3)
configurations
available:
Variable
Displacement Pumps. Fixed Displacement Motors, and
Variable Displacement Motors.
The Variable Displacement Pump can be operated with
fixed or variable input speeds and provides an infinitely
variable output flow between 0 and maximum flow in
either direction. A variety of controls are available for the
Variable Displacement Pumps and Motors which are
described on the following pages.
The Fixed Displacement Motor can be operated in either
direction of rotation with infinitely variable output speeds
between its 0 and maximum speed.
The Variable Displacement Motor provides a means for
varying the motor output speed and torque range.
Decreasing displacement results in higher output speed
and lower output torque.
Specifications and Requirements Sundstrand Heavy Duty
Hydrostatic transmissions have certain pressures that
must be maintained as well as some requirements and
limitations which must be observed.
SYSTEM REQUIREMENTS
Charge
Pressure *
190 - 210 PSI
13 - 15 BAR
(Neutral)
Charge
Pressure *
160- 180 PSI
11 - 12.5 BAR
(Forward or
Rev)
Case
Pressure
40 PSIG Max.
3 BAR Max.
Inlet
Vacuum**
10 in. Hg. Max.
254 mm Hg Max.
Inlet
10 Micron Nominal
Filtration
No Bypass
* Above case pressure. Some units may have special
charge
pressure
settings.
Consult
Machine
specifications.
**Measured at charge pump inlet. (May be exceeded
during cold weather start up).
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