Massey Ferguson 5400 - Issue 1.a
07B01.3
Intermediate shaft - Driving pinions - GPA20 brake
A . General
Engine speed is transmitted to the PTO clutch (1) fitted
at the front of the centre housing.
The layshaft (2) is linked via splines at one end to the
clutch and at the other end either to the double pinion
(13) in the 2-speed PTO version, or to the coupler
sleeve (31) in the economy 4-speed PTO version.
The double pinion (13) rotates on two taper roller bear-
ings (3) (4) and (7) (8) respectively mounted in the bore
of the centre housing and the cover (10).
A piston (9), housed in the cover and controlled by the
17 bar hydraulic circuit, allows braking of the double
pinion (13) when the control lever is placed in the PTO
brake position.
B . Operation
2-speed PTO
When the knob is pressed and turned clockwise, the
PTO solenoid valve supplies the clutch, and the
layshaft (2) is driven. It in turn drives the double driving
pinion (13) which is in permanent contact with the 540
rpm and 1000 rpm pinions on the lower shaftline.
4-speed PTO
This feature allows speeds of 540 rpm or 1000 rpm to
be obtained with an engine speed of 1550 rpm.
Standard position
The sleeve (31) being moved forwards, the layshaft (2)
is secured to the shaft (35) that drives the double
driving pinion (13). This configuration is identical to the
2-speed PTO version.
Economy position
By moving the sleeve (31) backwards, drive is trans-
mitted to the coupler pinion (34) (which rotates freely
on the shaft (35)) and to the double pinion (18) which
drives the driving pinion (13). The gear ratio of the
double pinion (18) is 1.292.
Power take-off brake
When the knob is in the PTO brake position, it allows
the opening of the PTO brake solenoid valve mounted
on the right-hand cover. The chamber behind the
piston (9) is supplied. The piston moves, compressing
the cup (8) on the cone (7) thus progressively immobi-
lising the driving pinion (13), constantly engaged with
the 540 rpm and 1000 rpm pinions.
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