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Massey Ferguson 5445, 5465, 5470 - Power Take-Off
On MF 5435, 5445, 5455, 5460, 5465, 5470, 5475 tractors the PTO drive
mechanism is fitted in the rear part of the axle, behind the
differential. The gear assembly rests on tapered roller bearings
supported by the axle housing at the front and by the PTO cover plate 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
gears, either directly or via a dog clutch/sliding sleeve allowing the
economy speeds to be selected (depending on version). The system mainly
consists of 2 shafts (3 if economy version): Input shaft, Secondary
shaft, Intermediate shaft (if economy version).
Standard PTO
The input shaft drives a double gear, which transmits the drive to two
gears on the secondary shaft. The PTO speed is selected by connecting
one of these two gears to the secondary shaft via internal splines or by
engaging the dog clutch (depending on option).
Standard and economy PTO
The input shaft drives: either a double gear via the dog clutch/sleeve
sliding forwards, which transmits the drive like the standard PTO, or a
series of idle-mounted gears driving the double gear when the dog
clutch/sleeve is slid backwards. Drive speed is therefore multiplied,
allowing the PTO speeds to be obtained at an engine speed of 1550 rpm.
The bearings supporting the driving gear shaft are adjusted with
clearance using one or more shims inserted between the rear cup and the
removable cover plate. An internal channel system carries lubricating
oil to the bearings and the driving gears via an oil gallery in the
housing and the radial bores in the shaft.
Lower shaftline
The lower shaftline is supported at the front by a bearing force fitted
into the housing, and at the rear by a bearing. The lower shaftline
output shaft is lubricated at the front bearing by a deflector and by
radial bores in the output shaft. The shaft is sealed by a lip seal
fitted into the rear cover plate of the housing.
The PTO shaft type may differ,
depending on the model:
Removable PTO: the shaft can be removed by removing a circlip. Two
shafts are available; each one corresponds to a different PTO speed
(540/1000 rpm). The splines of these shafts match with the splines of
the 540 and 1000 rpm gears. Each shaft is driven by the gear that
corresponds to its operating speed.
Shiftable PTO: the 540 and 1000 rpm gears are idle-mounted on the PTO
shaft. The speed is selected using a dog clutch situated between the two
gears. Depending on the option, the shaft may be a flanged shaft (3)
holding an end fitting with 6 or 21 splines, or a non-removable shaft
(2) comprising a number of fixed splines.
PTO brake
The rear power take-off is equipped with a brake located in the rear
housing.
Proportional PTO
The proportional PTO is driven by a shaft coupled to the front axle
clutch by a sliding sleeve. This shaft then drives the 540 rpm gear on
the lower shaftline. The sleeve sliding on the splines secures the front
axle clutch shaft or allows it to rotate freely.
Massey Ferguson 5435, 5445, 5455, 5460, 5465,
5470, 5475 - Existing power take-off types
Removable PTO
The drive shaft is secured to the double driving gear. The ratio is
selected by changing the PTO output shaft, which is provided either with
splines to be driven by the 540 rpm gear or with splines to be driven by
the 1000 rpm gear. When the 1000 rpm gear drives the shaft, the 540 rpm
gear turns idle on the shaft. The shaft used for the 540 rpm speed has 6
splines. The shaft used for the 1000 rpm speed has 21 splines. The PTO
brake acts on the rear bearing cup of the double driving gear.
Shiftable PTO
The drive shaft, connected to the PTO clutch, is attached to a
sleeve/dog clutch which selects the standard or economy speeds. The
double driving gear drives both the 540 and 1000 rpm gears. These gears
are then secured to the PTO output shaft by a dog clutch. The PTO brake
acts on the rear bearing cup of the double driving gear.
Shiftable PTO and flanged shaft
The operation is the same as for the shiftable PTO. The PTO output shaft
has an interchangeable end fitting to adapt the number of splines to the
hitched implement (6 or 21 splines).
Economy PTO
Economy PTO mode is selected by moving a sleeve/dog clutch. The drive is
no longer transmitted directly to the double gear, but passes via an
idler gear. The ratio of the additional double gear allows the PTO
speeds to be obtained when the engine speed is 1550 rpm.
Proportional PTO
The proportional PTO drive is obtained via the front axle clutch. A
sleeve (1) sliding on the splines secures the front axle clutch bell
housing (2). Drive is transmitted to the 540 rpm PTO gear. For MF 5435,
5445, 5455, 5460, 5465, 5470, 5475 2WD tractors equipped with a creeper
unit, a gear is fitted in place of the front axle clutch. The speed of
the PTO output shaft is then proportional to the tractor forward speed.
PTO with reinforced sealing
This type of PTO has reinforced sealing at the PTO output shaft. The
output shaft turns at the rear on two tapered roller bearings. A seal is
fitted behind these bearings. The PTO operates in exactly the same way
as the other shiftable versions.
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MF TRACTORS SPECIFICATIONS |
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MF FRONT END LOADERS |
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MF TRACTORS MAINTENANCE |
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MF TRACTORS TROUBLESHOOTING | ||||
1652 | 1749 | 2620 | 2725 | 2805 |
3050 | 3120 | 3640 | 3709 | 4245 |
4455 | 5320 | 5455 | 5613 | 6150 |
6280 | 6480 | 6615 | 7618 | 7720 |