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Massey Ferguson 6497, 6499 PTO - Interchangeable output shaft
The GPA30 rear axle PTO housing encloses: driving pinions; driven
pinions (7) (18) (540/1000 rpm or, optionally, 750/1000 rpm);
interchangeable output shaft (13) of the lower shaftline. The
interchangeable output shaft is supported: 1) at the front by a
cylindrical roller bearing (24). This bearing is fitted into the front
bearing (1), which is attached to the rear partition of the centre
housing; 2) at the rear by a splined sleeve (5) which rotates on 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.
In the 540 rpm or 750 rpm configurations, the interchangeable output
shaft (13) is splined in rotation to the driven pinion (7). Pinion (18)
runs idle on the hub of the pinion (7) and the front end of the sleeve
(5). In the 1000 rpm configuration, the interchangeable output shaft
(13) is splined in rotation to the pinion (18). Pinion (7) then runs
idle in the bore of the pinion (18) and the front bearing (1). Friction
washers (10) (20) ensure the contact between rotating parts.
Castellated washer (4) is integral via a tab with sleeve (5) which
itself is splined to interchangeable output shaft (13). This washer
informs the tractor electronic system of the output speed of the
interchangeable 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 interchangeable output shaft
(13) provides splash lubrication of: driven pinions (7) (18); front
cylindrical roller bearing (24); friction washers (10) (20); 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) Front bearing (2) Screw (3) Bearing
cone (4) Castellated washer for sensor (if fitted) (5) Splined sleeve
(6) Snap ring (7) 540 or 750 rpm driven pinion (8) Bearing cone (9)
Protector (10) Friction washers (11) Screw (12) O’ring (13)
Interchangeable output shaft (14) Cassette seal (15) O’ring (16) Circlip
(17) Circlip (18) 1000 rpm driven pinion (19) Bearing cup (20) Friction
washer (21) Bearing cup (22) Rear bearing (23) Shim(s) (24) Cylindrical
roller bearing
Massey Ferguson 6497, 6499 - Removing and
refitting the 540/1000 rpm or 750/1000 rpm driven pinions
Split the rear PTO housing from the centre housing.
Removing the 540/1000 rpm driven pinions
Place the PTO housing flat on a workbench in order to allow removal of
the interchangeable output shaft (13). Recover the friction washer (20)
that may still be on the driven pinion (7). Take off: snap ring (6);
interchangeable output shaft (13); the driven pinion (7). Recover the
friction washer (10) fitted between the driven pinions (7) (18). Remove
the driven pinion (18). Recover the friction washer (10) fitted between
the pinion (18) and splined sleeve (5). Discard the O-ring (12).
Removing the 750/1000 rpm driven pinions
On the PTO with interchangeable output shaft (13), the removing
procedure for 750/1000 rpm driven pinions (7) (18) is similar to that
applied for the 540/1000 rpm driven pinions (7) (18).
MF 6497, 6499 - Refitting the 540/1000 rpm
driven pinions
Clean and check all components. Replace any defective parts. Check that:
the central channel and radial ports of the interchangeable output shaft
(13) are not obstructed; the splined sleeve (5) free from chippings
and/or burr. Grease the O’ring (12) with clean transmission oil. Refit
in the groove of the splined sleeve. Lightly smear a friction washer
(10) with miscible grease. Place the washer on the splined sleeve (5).
Stack the driven pinions (18) (7) on the splined sleeve (5), inserting
the second friction washer (10), previously smeared with miscible
grease, between each pinion. Grease the interchangeable output shaft
(13) with clean transmission oil. Engage it in the bores of the driven
pinions (18) (7) and push home against the shoulder of the splined
sleeve (5). Refit the snap ring (6). Lightly smear the friction washer
(20) with miscible grease. Place this washer against the cylindrical
roller bearing (24). Fit the PTO housing in a vertical position.
Refitting the 750/1000 rpm driven pinions
On the PTO with interchangeable output shaft (13), the refitting of
750/1000 rpm driven pinions (7) (18) is similar to that of the 540/1000
rpm driven pinions (7) (18). Assemble the rear PTO housing to the centre
housing.
Removing and refitting the front bearing
Split the rear PTO housing from the centre housing.
Removal - Recover the friction washer (20). If necessary, release screws
(11). Remove the front bearing block (1). Note the orientation of the
cylindrical roller bearing (24) in the front bearing block. Extract this
bearing.
Refitting - Clean and check all components. Replace any defective parts.
Using a suitable locally made fitting drift, fit the cylindrical roller
bearing into the bearing block, turning the rounded profile of its
metallic cage towards the interchangeable output shaft (13). Refit the
front bearing block (if removed). Lightly smear the thread of the screws
(11) with Loctite 242 or equivalent. Tighten these screws to a torque of
27-35 Nm. Lightly smear the friction washer (20) with miscible grease.
Place this washer against the cylindrical roller bearing (24). Assemble
the rear PTO housing to the centre housing.
Removing and refitting the rear bearings
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 interchangeable output shaft (13). If fitted, remove the
sensor located on the lower right-hand side of the power take-off
housing. Remove: interchangeable output shaft (13); driven pinions (7)
(18). Loosen the screws (2). Remove the rear bearing assembly (22) which
consists of: cassette seal (14); O-ring (15); shim(s) (23). Remove the
cup (21) from the rear PTO housing. Remove the rear bearing assembly (5)
which consists of: bearing cones (3) (8); castellated washer (4);
circlips (16) (17). Remove cup (19).
Remove the circlips (16) (17) from the splined sleeve (5). Split from
the splined sleeve (5): bearing cones (3) (8); castellated washer (4).
Refitting - Clean and check all components. Replace any defective parts.
Check that: central channel and radial ports of the interchangeable
output shaft (13) are not obstructed; splined sleeve (5) free from
chippings and/or burr. Refit on the splined sleeve (5): castellated
washer (4) by sliding its tab into the sleeve groove; bearing cones (3)
(8) on either side of the castellated washer; circlips (16) (17). Refit
on the PTO housing: bearing cup (19); rebuilt splined sleeve assembly
(5); bearing cup (21). If necessary, replace: cassette seal (14); O-ring
(15) of the rear bearing. 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). Lubricate the cassette
seal (14) and O-ring (15). Refit the rear bearing (22) 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); the interchangeable output shaft (13). 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.
Massey Ferguson 6497, 6499 - Removing and
refitting the interchangeable output shaft
To avoid oil spillage when removing the interchangeable output shaft
(13): either partially drain the rear axle; or chock the tractor front
wheels using safety shims and raise the rear axle.
Removal
Take off: snap ring (6); interchangeable output shaft (13). If
necessary, discard the O'ring (12).
Refitting
Check that the splined sleeve (5) is free from chippings and/or burr. If
necessary, lubricate a new O’ring (12). Refit the seal in its groove.
Check that the central channel and radial ports of the interchangeable
output shaft (13) are not obstructed; Insert the interchangeable output
shaft into the splined sleeve (5). Turn the shaft right and left to
ensure that its splines mesh with those of the concerned driven pinion.
Refit snap ring (6). Depending on what was performed during operation:
either top up the oil levels in the housings and check the transparent
tube on the left-hand side of the centre housing; or place the tractor
rear wheels back on the ground and remove the trolley jack and safety
shims.
MF 6497, 6499 - Replacing the rear bearing
cassette seal
Partially drain the rear axle.
Extracting the seal
Loosen the screws (2). Remove the rear bearing (22) by pushing the
interchangeable output shaft forwards to hold the splined sleeve (5) in
place. Recover the shim(s) (23). Discard the O'ring (12). Note the
position of the cassette seal (14) in the rear bearing (22). Extract the
cassette seal. Discard the O'ring (15).
Replacing the seal
Clean and check all components. Replace any defective parts. Using the
tool, insert the cassette seal (14) in the bearing (22), turning the
seal lip towards the inside of the PTO housing. After inserting, check
that the seal is positioned as indicated in figure. Check that the
splined sleeve (5) and interchangeable output shaft (13) are correctly
positioned in the PTO housing.
Fit a new O’ring (15) on the rear bearing (22). Lubricate the inner rim
of the cassette seal (14) and O’ring (15) with clean transmission oil.
To facilitate refitting the rear bearing (22) on the PTO housing, screw
two opposing threaded rods (M10 x 50 mm approximately) into the tapped
screw holes (2). These rods shall be used as guides. Position the rear
bearing (22) with its original shim(s) on the threaded rods. Hold the
interchangeable output shaft pushed forwards.
Simultaneously screw two nuts (M10) with flat washers on the threaded
rods to uniformly insert: rear bearing (22) into the PTO housing;
cassette seal (14) on the sleeve (5). As soon as the rear bearing (22)
rests against the shim(s) (23), remove the nuts and threaded rods.
Lightly smear the thread of the screws (2) with Loctite 242 or
equivalent. Tighten these screws to a torque of 72-96 Nm. Top up the oil
level in the housings. Check it using the sight glass located to the
left of the centre housing.
Massey Ferguson 6497, 6499 - Shimming the rear
bearings
Split the rear PTO housing from the centre housing. Take off: 540/1000
rpm or, optionally, 750/1000 rpm driven pinions; sleeve assembly (5)
consisting of the bearing cones (3) (8) and their cups, of the splined
washer (4) and circlips (16) (17). Note dimensions A and B. To avoid
being hindered by the resistance of the cassette seal (14) on the
splined sleeve (5), the seal should be temporarily excluded during
measurement of A and B values.
Dimension A - Using a depth gauge, measure dimension A on the PTO
housing. Dimension B - Place the sleeve assembly (5) consisting of the
bearing cones (3) (8) and their cups, of the splined washer (4) and
circlips (16) (17) against the rear bearing (22).
Ask an operator to exert a strong and constant manual pressure on the
bearing cup (19). Turn the splined sleeve (5) from left to right so as
to correctly seat the bearing cones in their cup. Measure dimension B at
two opposing points. Take the average of the two measurements. Calculate
B - A. Depending on the result, select a thickness of shim(s) (23) to
obtain a clearance J of 0.05 to 0.15 mm. If possible, shim so as to
obtain minimum tolerance.
Refit: the sleeve assembly (5) consisting of the bearing cones (3) (8)
and their cup, of the splined washer (4) and circlips (16) (17); the
rear bearing (22), fitted with: a new cassette seal (14), the shim(s)
(23) selected during operation. 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 540/1000 rpm or, optionally, 750/1000 rpm driven
pinions; 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 |