Yale MPB040-E, Manual

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4000 YRM 1008 General
General
LIFT LINKAGE
This section has the description and repair procedures
for the MPB040-E, MPW045-E, MPW050-E units. The
lifting mechanism is operated by the hydraulic system.
Hydraulic fluid extends the lift cylinder, operates the lift
linkage, and raises the forks.
On all motorized lift trucks, when the lift button on the
control handle is depressed, the hydraulic pump sends
high pressure hydraulic fluid to the lift cylinder. This
action extends the cylinder, operates the lift linkage, and
raises the forks. At the same time, the rocker arms
and the rear links mounted under the drive unit platform
are pulled upward. This causes the push rod assembly
to be pushed toward the load wheel end of the truck.
The movement of the push rods in this direction causes
the load wheels to pivot down on their pivot pins. See
Figure 1.
1. LOWER LINK (LH)
2. LOWER LINK (RH)
3. FORK
4. LOAD WHEEL (LH)
Figure 1. Lift Linkage
1