Massey Ferguson 5400 - Issue 1.a
07A01.3
General - GPA20 operation
A . General
Description
- The PTO drive mechanism is fitted in the rear part of
the axle, behind the differential. The pinion assembly
rests on taper roller bearings supported by the axle
housing at the front and by the PTO cover at the rear.
- The assembly is driven by the engine via a shaft that
passes through the gearbox primary shaft.
Clutch
- The clutch is located on the upper power take-off
shaftline at the front of the centre housing.
- It is supported by two bearings fitted in the housing.
Upper shaftline
- The PTO upper shaftline transmits drive from the
engine to the driving pinions, either directly or via a
coupler / sliding sleeve allowing to select the
economy speeds (depending on version).
- The system is comprised mainly of 2 shafts (3 if
economy version):
-mainshaft
- secondary shaft
- layshaft (if economy version).
• Standard PTO
The mainshaft drives a double pinion, which trans-
mits drive to two pinions on the secondary shaft. The
PTO speed is selected by securing one of the two
pinions to the secondary shaft via internal splines or
by coupling (depending on option).
• Standard and economy PTO
The mainshaft drives:
- either a double pinion via the coupler / sleeve slid
forwards, transmitting drive like the standard PTO,
- or a series of idle-mounted pinions driving the
double pinion when the coupler / sleeve is slid to
the rear. Drive speed is therefore multiplied,
allowing to obtain PTO speeds when engine speed
is 1550 rpm.
- The bearings supporting the driving pinion shaft are
adjusted with clearance using (a) shim(s) inserted
between the rear cup and the removable cover.
- An internal channel system carries lubricating oil to
the bearings and drive pinions via an oil gallery in the
housing and radial bores in the shaft.
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