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Massey Ferguson 6497, 6499 PTO - Shiftable output shaft
The GPA30 rear axle PTO housing encloses: the driving pinions; the
driven pinions (7) (18) (540/1000 rpm or, optionally, 750/1000 rpm); the
shiftable output shaft (13); a coupler (10) controlled by a fork (31).
The shiftable output shaft is supported: at the front by a cylindrical
roller bearing (24). This bearing is directly fitted onto the rear
partition of the centre housing; at the rear, by two taper roller
bearings (3) (19) and (8) (21). Taper roller bearing clearance is
adjusted using shim(s) (23) placed between the PTO housing and the rear
bearing (22). The driven pinions (7) (18) are constantly meshed with the
upper shaftline driving pinions (see chapter 7). The hub (11) of the
coupler is splined to the shiftable output shaft (13). The driven
pinions (7) (18) drive the shaft when coupler (10) is moved either
forwards (540 or 750 rpm), or rearwards (1000 rpm).
When one of the pinions (7) (18) transmits movement to the shiftable
output shaft (13), the other pinion is passive and idles on its shaft. A
fork (31) fitted on the pin (28) allows selection of the required speed
(540/750 - or 1000 rpm). This fork may be controlled either by an
external lever located on the right-hand side of the PTO housing, or via
a cable operated by a lever placed inside the cab. The castellated
washer (4) is integral with the shiftable output shaft (13) via a tab.
This washer informs the tractor electronic system of the output speed of
the shiftable shaft via a sensor (if fitted) located on the lower
right-hand side of the PTO housing.
Lubrication
A central channel with radial ports on the shiftable output shaft (13)
provides splash lubrication of: the driven pinions (7) (18); the front
cylindrical roller bearing (24); the rear taper roller bearings (3) (19)
and (8) (21). The oil tightness of the rear bearing is provided by
cassette seal (14) and O-ring (15).
Parts list - (1) Circlip (2) Screw (3) Bearing cone (4)
Castellated washer for sensor (if fitted) (5) Flange shaft (6) Screw (7)
540 or 750 rpm driven pinion (8) Bearing cone (9) Protector (10) Coupler
(11) Hub (12) Circlip (13) Shiftable output shaft (14) Cassette seal
(15) O’ring (16) Circlip (17) Circlip (18) 1000 rpm driven pinion (19)
Bearing cup (20) Splined washer (21) Bearing cup (22) Rear bearing (23)
Shim(s) (24) Cylindrical roller bearing (25) Oil deflector (26) Circlip
(27) O’ring (28) Pin (29) Pads (30) Set screw (31) Fork (33) Internal or
external (depending on version) control link (34) Screw (35) Locating
pin (36) Cup cap, A - External PTO control, B - Internal PTO control
MF 6497, 6499 - Removing and refitting the
540/1000 rpm or 750/1000 rpm driven pinions and control fork
Split the rear PTO housing from the centre housing.
Removal
Place the PTO housing flat on a workbench. Remove the block consisting
of the PTO clutch (15) and unit/driving pinions (23) assemblies while
simultaneously removing the driven pinion (7). Remove the link (33).
Undo the set screw (30).
Take out the PTO housing: pin (28). Discard the O'ring (27); fork (31)
with its pads (29). Take off: circlip (26); coupler (10); hub (11);
circlip (1); the driven pinion (18).
Refitting
Clean and check all components. Replace any defective parts. Check that
the central channel and radial ports of the shiftable output shaft (13)
are not obstructed; Lubricate the friction ring (1) of the driven pinion
(18).
Refit: driven pinion (18); new circlip (1); hub (11); coupler (10); new
circlip (26). Refit in the PTO housing: the fork (31) with its pads
(29), lightly smeared with miscible grease; the pin (28) with a new
O-ring (27). Position the fork on the pin (28). Lightly smear the thread
of the set screw (30) with Loctite 242 or equivalent. Moderately tighten
this screw. Refit the link (33). Moderately tighten the screws (34).
Lubricate the friction ring (1) of the driven pinion (7). Refit the
block consisting of the PTO clutch (15) and unit/driving pinions (23)
assemblies while simultaneously refitting the driven pinion (7). Fit the
PTO housing in a vertical position. Assemble the rear PTO housing to the
centre housing.
Massey Ferguson 6497, 6499 - Removing and
refitting the front bearing
Split the rear PTO housing from the centre housing.
Removal
Note the orientation of the cylindrical roller bearing (24) in the
centre housing. Extract this bearing. Extract the bearing. Remove the
oil deflector (25).
Refitting
Clean and check all components. Replace any defective parts. Refit the
oil deflector in the bore of the centre housing. Using a suitable
locally made fitting drift, fit the cylindrical roller bearings in the
centre housing, turning the rounded profile of its metallic cage towards
the shiftable output shaft (13). Manually check that the bearing is
resting against the deflector. Assemble the rear PTO housing to the
centre housing.
MF 6497, 6499 - Removing and refitting the
rear bearings and shiftable output shaft
Split the rear PTO housing from the centre housing.
Removal
Place the PTO housing flat on a workbench in order to allow removal of
the shiftable output shaft (13).
If fitted, remove the sensor located on the lower right-hand side of the
power take-off housing. Remove the 540/1000 rpm or, optionally, 750/1000
rpm driven pinions (7) (18); Loosen the screws (2).
Remove the rear bearing (22)/output shaft (13) assembly which consists
of: the cassette seal (14); the O-ring (15); the shim(s) (23); the cup
(21); bearing cones (3) (8); castellated washer (4); circlips (16) (17).
Remove the cup (19) from the rear PTO housing. Remove from the shiftable
output shaft (13): circlip (17); bearing cone (3); castellated washer
(4); bearing cone (8); bearing cup (21); the circlip (16). Strip the
output shaft (13), removing: bearing (22) with its cassette seal (14 )
and O-ring (15); flange shaft (5) (if necessary).
Refitting
Clean and check all components. Replace any defective parts. Check that
the central channel and radial ports of the shiftable output shaft (13)
are not obstructed. Equip the output shaft (13) by refitting: the flange
shaft (5). Tighten the screws (2) to torque; the rear bearing (22). If
necessary, replace the cassette seal (14) and O-ring (15). On the
shiftable output shaft, refit: circlip (16); bearing cup (21); bearing
cone (8); castellated washer (4); bearing cone (3); circlip (17). Refit
the cup (19) in the rear PTO housing. Refit the original shim(s) (23)
onto the bearing block (22) only if the rear bearings do not need
shimming.
The rear bearings must be shimmed if at least one of the following parts needs replacing: PTO housing; castellated washer (4); bearing cones and cups (3) (8) and (19) (21); rear bearing (22). Refit the rear bearing (22) / shiftable output shaft assembly on the PTO housing. Lightly smear the thread of the screws (2) with Loctite 242 or equivalent. Tighten these screws to a torque of 72-96 Nm. Refit the driven pinions (18) (7): If necessary, refit the sensor located on the lower right-hand side of the power take-off housing. Moderately tighten the screw. Fit the PTO housing in a vertical position. Assemble the rear PTO housing to the centre housing.
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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 |