SERVICE MANUAL A-ERGO
SERVICE MANUAL A-ERGO
SMA-Ergo_08_2009A.fm
SMA-Ergo_08_2009A.fm
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Hose rupture valve
Hose rupture valve
Hose rupture valves, the purpose of which is to prevent the forks dropping down out of
Hose rupture valves, the purpose of which is to prevent the forks dropping down out of
control if for example a hydraulic hose ruptures, are fitted in most of
control if for example a hydraulic hose ruptures, are fitted in most of the lift and stabiliser
the lift and stabiliser
cylinders. They are placed in front of the nipple connected for the supply of hydraulic oil.
cylinders. They are placed in front of the nipple connected for the supply of hydraulic oil.
In the free-lift cylinder a l
In the free-lift cylinder a lowering brake valve is normally fitted instead.
owering brake valve is normally fitted instead.
Lowering brake valve
Lowering brake valve
The lowering brake valve regulates the lowering speed and is mounted in a valve housing,
The lowering brake valve regulates the lowering speed and is mounted in a valve housing,
placed in the lower section of the mast. It c
placed in the lower section of the mast. It controls the lowering speed of the cylinders
ontrols the lowering speed of the cylinders
(TV, TFV, DTFV cylinders). For free-lift there is a lowering brake valve in the bottom of
(TV, TFV, DTFV cylinders). For free-lift there is a lowering brake valve in the bottom of
the free-lift cylinder (T cylinder).
the free-lift cylinder (T cylinder).
The valve is set
The valve is set at the factory, but may subsequently be adjusted. Check the lowering
at the factory, but may subsequently be adjusted. Check the lowering
speed in relation to table
speed in relation to table 8.2
8.2 before repairing or adjusting.
before repairing or adjusting.
There are no external
There are no external lowering brake valves on trucks equipped with electric
lowering brake valves on trucks equipped with electric control
control
valves and they are integrated as a
valves and they are integrated as a function in the control valve
function in the control valve instead, see
instead, see "Electric
"Electric
control valve" on page 8.2
control valve" on page 8.2. On these trucks there should be a hose rupture valve.
. On these trucks there should be a hose rupture valve.
Mechanical control valve
Mechanical control valve
General
General
The control valve controls the lifting and lowering movements of the truck. The lifting
The control valve controls the lifting and lowering movements of the truck. The lifting
and lowering speed is proportional to
and lowering speed is proportional to the operation of the c
the operation of the control lever.
ontrol lever.
Lifting function
Lifting function
The pump provides pressure to the lift cylinders through the open control
The pump provides pressure to the lift cylinders through the open control valve. If the lift
valve. If the lift
cylinders are obstructed, have an exce
cylinders are obstructed, have an excessive load, or if there is
ssive load, or if there is a fault on the control valve
a fault on the control valve
so that it does not open, the
so that it does not open, the oil will return to
oil will return to the tank through the pressure limiting valve.
the tank through the pressure limiting valve.
Lowering function
Lowering function
The control valve opens to release the oil from the lift cylinders. When the fork carriage
The control valve opens to release the oil from the lift cylinders. When the fork carriage
presses down the lift cylinder the oil
presses down the lift cylinder the oil flow goes through the lowering brake valve, which
flow goes through the lowering brake valve, which
regulates the lowering speed, see table
regulates the lowering speed, see table "Adjusting the lowering brake valve" on page 8.22
"Adjusting the lowering brake valve" on page 8.22..
Electric control valve
Electric control valve
General
General
The control valve controls the lifting and lowering movements of the truck. The lifting
The control valve controls the lifting and lowering movements of the truck. The lifting
and lowering speed is proportional to
and lowering speed is proportional to the operation of the c
the operation of the control lever.
ontrol lever.
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