Kalmar Ottawa t2, Maintenance Manual

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7.2 Lift and Lower – 7 Load Handling 67
Maintenance Manual Ottawa T2 4x2
mm mm mm mm mm mm
7 Load Handling
7.2 Lift and Lower
page –
Description (Boom Components)
Elevated Boom with Fifth Wheel
1. Boom Pivot
2. Boom
3. Boom Lift Cylinder Pivots
4. Fifth-Wheel Pivot
5. Fifth-Wheel Plate
The standard hydraulically operated boom is the basis for the
fifth-wheel lifting system. The forward end of the boom assem-
bly is attached to the frame at a pivot point behind the cab.
Mounted at the rear of the boom is the fifth wheel which is
raised and lowered through the action of two hydraulic cylin-
ders installed between the boom and frame weldments just for-
ward of the rear axle. Power to operate the cylinders is supplied
by the hydraulic pump mounted on the transmission.
7.2.1 Hydraulic Pump
page –
Description
On a standard chassis, the hydraulic pump is a fixed, positive
displacement gear type. The pump is rated at 10 gallons (38 li-
ter) per minute at high idle (approximately 1200 rpm). A relief
valve in the lift control valve limits operating pressure.
7.2.3 Control Valve
page –
Description
The valve housing is a one-piece mono-block casting. The “A”
and “B” work ports are precision machined and threaded to ac-
cept the “T” and “P” pressure (inlet) passages. The valve is
open-centered and closed port. Incorporated in the valve as-
sembly are load check valves and a relief cartridge with a max-
imum relief pressure of 2000 psi (138 bar) for the 5-inch
(127 mm) diameter cylinders. The valve is actuated remotely
from the cab by the boom lift control lever. The boom lift control
lever is attached to a control cable that pulls and pushes the
control valve spool to the desired positions.
1
* BOTH SIDES
*
OTT0002a
3
*
5
2
4
*