Rayco RG25HD, Operator, Service, Maintenance, Parts Manual

Page: 47 / 72

RG25DH Operation • Service • Maintenance • Parts Manual
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47
Troubleshooting
4
Light Duty Hydrostatic
Model 6
The Model 6 transmission is designed
primarily for light duty applications requiring
up to 1,9 Kw [2.5 hp] output for continuous
operation.
Operation
For optimum control and power, the
transmissions should be operated at
constant input speeds. When operating the
unit under varying load conditions there can
be noticeable changes in the output speed. If
the output speed decreases due to increased
load, the shift lever should be directed
toward neutral position to increase the
output torque. This produces the same
result as shifting down to a lower gear with a
typical mechanical transmission.
The Model 6 transmission can include a dump
valve which, when actuated, enables the
vehicle to be pushed with the engine off.
Caution: Motor speed must not exceed 350
RPM when the valve is actuated.
Drive
A belt drive is preferred, with the sheave
diameter 102 mm [4 in.] or less. Be sure to
locate the belt over the input shaft bearing
because excessive side loading can cause
problems. Follow the belt manufacturer’s
recommendation for belt tension to transmit a
maximum of 3 Kw [4 hp]. The unit can be
driven direct with a flexible coupling between
an engine or motor and the input shaft of the
transmission. Be sure the two shafts are in
alignment.
Cooling
Proper cooling is essential to both performance
and life of the transmission. The recommended
maximum oil operating temperature is 82 ° C
[180 ° F]. In order to provide adequate cooling,
an 200 mm [8 in.] diameter fan should be used
on the input side. If properly designed and
installed, the fan will effectively cool the
transmission up to approximately four input
horsepower.
Fluid
See Bulletin 3-401 for recommended fluids. The
standard factory fill is premium hydraulic fluid
having a viscosity equivalent to SAE 20W20.
Options
• Wide Band Neutral
• Dump Valve
Model 6
Internal Reservoir/Expansion Tank
Air Bleed Plug
Output Shaft
Dump Valve
Tapered
Control Shaft —
for Installation
of a Customer
Control Lever
Recommended Center Line of Drive Sheave
Coupling and
Pulley
(Customer
Supplied)
Input Shaft
Cooling
Fan
(Customer
Supplied)
Control Lever Length — 100 mm [4 inch]
End of
Shaft
35 mm [1.4 in.]