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SECTION 5
Push Valve Function
Because of the "dynamic brake" feature of the hydro-
static transmission, the tractor can be pushed for only a
few feet before the rear wheels will lock.
If the tractor
must be pushed, the manual bypass Push Valve must be
opened. The valve is located
inboard
of the left rear wheel
on C-Series tractors. To operate the valve, follow the in-
structions on the "push valve" decal.
The valve has a
!
square head and can be opened or closed with a wrench. Be
:
sure to close the valve before operating the tractor.
Fig. 5-15 C-Series Automatic, Push Valve
Hand push tractor only.
Do not tow. Towing can
cause severe damage to the hydrostatic transmission.
Acceleration Valves
Acceleration valves are used in the hydraulic drive circuit
to limit vehicle acceleration to a safe rate.
Two valves are used: a forward valve and a reverse valve.
See Fig. 5-16.
Although the acceleration valves look simi lar, they
are not alike. The forward valve, located at the rear
of the end cap housing, incorporates wider relief flats
on the valve lands than does the reverse valve, located
at the front of the end cap housing. The forward
valve may be used
in
place of the reverse valve; how-
ever, under no circumstance should the reverse valve
be substituted for the forward valve.
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Fig. 5-16 C-Series Automatic Acceleration Valves
5-6
Implement Relief/Charge Valve
The implement relief valve is used to regulate hydraulic
lift pressure. This valve limits pressure to maximum of 550
to 700 psi (38 to 50 kg/cm 2 ). It is located to the rear of
the pump housing. The charge pressure relief valve is loca-
ted to the front of the pump housing on models equipped
with a hydraulic lift, and to the rear of the pump housing
on models equipped with a manual lift. The charge pressure
relief valve limits pump and motor circuit hydraulic
pressure to 70 to 150 psi (4.9 to 10.5 kg/cm 2 ). See Fig.
5-17 and
Fig.
5-18.
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LUG
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Fig. 5-17 C-Series Automatic Charge Pressure Valve
(Manual Lift)
Fig. 5-18 C-Series Automatic Implement Relief/Charge
Valves and Hydraulic Hose Routing (Hydraulic liftl
Hydraulic Hose and line Routing
Hydraulic line routing is shown in Fig. 5-18. Connections
are shown in Fig. 5-19.
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