Alamo RHINO 7214 MSL - Manual (Page 33)

F-3778-12-04 Operation Section 4-11
© 2004 Alamo Group Inc.
OPERATION
OPERATION
OPERATION AND NOMENCLATURE OF MSL
(Mechanical Self Leveling) LOADER
MSL maintains the attitude of loader bucket or attachment
relative to ground as set by the operator using the tilt
cylinders. Constant attitude is maintained when lift
cylinders raise or lower boom, as long as no tilt
adjustment is made.
MSL consists of linkages connected to loader uprights
and extending forward to triangular pivot plates. Equal
displacement tilt cylinder base ends are attached to the
pivot plates and rod ends are attached to another linkage
commonly referred to as a “four-bar linkage.” The four-bar
linkage, which allows increased dump and rollback
rotation connects to bucket or attachment.
Hydraulic relief for tilt cylinders is required when raising
the boom with attachment fully dumped. The attachment
contacts dump stops on underside of front ends of boom.
While raising boom, MSL system pushes attachment
tighter against dump stops and tilt cylinder base end
pressure increases. A hydraulic relief valve cartridge
allows the pressurized oil to transfer to rod end of tilt
cylinder, eliminating excessive loads on MSL system.
Hydraulic relief is not necessary when lowering boom.
IMPORTANT: It is important that the tilt cylinder oil line
tubes and hoses are correctly plumbed for proper
operation of MSL relief valve. Refer to diagram below.
Pressure setting for relief valve is set at 210 bar (3,045
psi) and MUST be maintained at that level. The cartridge
is stamped with required 210 bar setting.
MSL
Linkage Boom MSL Triangular
Pivot Plate
Tilt
Cylinder
Four-Bar
Linkage
Attachment
Link
Guide
Link
Tilt Dump
Stop
Quick-Attach
Bracket Relief
Cartridge
Loader
Upright
Lift Cylinder
Tilt Cylinder
Base End
Tilt Cylinder
Rod End
Relief Valve
Cartridge