Mahindra DISC PLOUGH User manual

FOREWORD
The purpose of this manual is to explain to you the correct procedure for assembly, maintenance and routine adjust-
ments, which are necessary for the most efficient operation of your Disc Plough. To protect your investment, study
this manual before assembling and /or operating in the field.
This manual has been carefully prepared and the information is arranged and illustrated in a manner to make it as easy
as possible for you to find required information. The “exploded view” of each unit shows the individual parts clearly
and their normal relationship to one another.
By selecting the Disc Plough manufactured by Mahindra & Mahindra Ltd. you purchase a product which has been
designed and developed to suit your soil and farming conditions. We feel that you will obtain from this Disc Plough the
economical and superior performance for which it is designed.
Properly adjusted and maintained, the Disc Plough will respond to all reasonable demands you make upon it and give
you reliable service for years to come.
It is a policy of Mahindra and Mahindra Ltd. to improve its products wherever it is possible and practical to do so. We
reserve the right to make changes or add improvements at any time without incurring any obligation to make such
changes on any implements sold previously.

Disc Plough
MANUFACTURER’S WARRANTY
1. Mahindra & Mahindra Limited, tractor division (here-
inafter called ”company”) warrants to the retail pur-
chaser of the products manufactured by them that the
Company's dealer will repair or replace any part thereof
subject to limitations specified herein below found to
be defective in materials or workmanship in their opin-
ion, within 6 months of operation, from the date when
the products are delivered new to the original retail
customer (the purchaser).
2. This warranty is limited to the delivery to the retail
purchaser, free at the Authorised Dealers workshop, of
the part or parts whether repaired or replaced in ex-
change for those acknowledge by the company to be
defective.
3. This warranty is a differential policy by which we are
giving warranty only on those items marketed by the
company & not on all items.
4. The Customer will be required to make a thorough ex-
amination of the Product prior to Purchase. The
Authorised Dealer are in no way the legal agents of the
Company and have no right or authority to give any
other warranty or assume any obligation on the behalf
of the Company or bind the Company in any matter
whatsoever.
5. For the purpose of Warranty, the term Product means
& includes only new Implements & Attachments manu-
factured or marketed by the or for the Company to the
Company’s designs and drawings and sold and installed
by the Authorised Dealer. The term product does not
include Frame, Discs, Bearings, fasterners, furrow
wheel disc, scrapper & spring. Proprietary articles are
covered by the warranty (if any) given by the respec-
tive manufactures. Their decision would be final on
the proprietary items as regards the claims.
6. The company’s responsibility is limited to the term of
this warranty and it shall not be liable for personal
injuries or consequential liability, damage or loss aris-
ing from any defects. This warranty shall not apply to
the defects / damages caused by normal wear & tear,
accidents, misuse or negligence on the part of cus-
tomer, defects in the products which have been al-
tered outside company’s works or which have been let
out on hire, or in case of tempering or removal, alter-
ation of identification marks.

Disc Plough
7. The Company’s Liability under this Warranty is depen-
dent upon the strict observance by the Customer, of
the following provisions :
a) The Customer at the time of delivery shall sign,
complete and return the Authorised Warranty Card.
b) Repair or replacement will be performed by the
facility of Authorised Dealer / its branch dealer /
its Authorised Service Centre only, following deliv-
ery of the product by the customer to the facility
of Authorised Dealer / its branch dealer /its
Authorised Service Centre.
c) This warranty shall not apply if the product or part
any there of is repaired or altered not in accor-
dance with our standard repair procedure or by
any person other than an Authorised dealer / its
branch dealer / its Authorised Service Center.
d) The decision of the company or the concerned
authorised dealer in regards to the claims shall be
final & conclusive and the customer hereby agrees
to the unconditionally accept their decision on all
questions, as defects and to the exchange of part
or parts.
e) Claims arising from this warranty will be consid-
ered only if they are notified in writing to the con-
cerned Authorised Dealer or to the company
promptly after the defects has been ascertained.
f) The company reserves the right to make changes
in designs or introduce any improvement or added
any parts on the products at any time without in-
curring any obligation to install the same on the
products previously sold.
g) The customer shall at all the times use only those
brands of lubricants oils, lubricants or fuel which
are approved in writing by the company, for oper-
ating the products.
8. The use of replacement parts, not manufactured or
supplied by the company, on the products will auto-
matically invalidate this warranty.
9. The above warranty is in lieu of all other Warranties
expressed or implied, and no person, agent or repre-
sentatives of the company is authorised to give any
other Warranties on the company’s behalf or assume
of if any other liability in connection, with the above
products.
MANUFACTURER’S WARRANTY

Disc Plough
10.The court at Mumbai shall have exclusive jurisdiction
to try, entertain and dispose off all proceeding relat-
ing the any dispute arising between the Company and
the Customer on the liability of the Company under
this warranty.
MANUFACTURER’S WARRANTY

Disc Plough
Operation General .................................................................................... 1
Adjustments ............................................................................................ 3
Operation Disc Plough ................................................................................ 6
Trouble Shooting ..................................................................................... 12
Setting up Instruction ............................................................................... 14
Storage ................................................................................................ 18
Parts Catalogue ...................................................................................... 19
CONTENTS

Disc Plough
PRE-PREPRATION PRIOR TO USE
Plough bottoms, discs and other parts finished with a light
polish and varnish before leaving the factory to prevent
rust, Good work cannot be accomplished until varnish is
removed. For this purpose use a good varnish remover.
Lubricate plough in accordance with instructions given on
page 3.
ATTACHING PLOUGH TO THE TRACTOR
Remove swinging draw bar (if fitted on the tractor) or
move the pins to one side so as to ensure that It does not
foul with the plough.
Reverse the tractor to the plough and line up the three
point linkage lower draft links. Attach the top link if ad-
justable.
ATTACH THE LEFT LOWER DRAFT LINK.
Use the levelling gear box on right lift rod of the tractor
to attach the lower the draft link at the right, to the plough
rockshaft.
In case of top link being not adjustable attach lower left
draft link first, then the right side draft link and finally,
the top link.
Note: Leave the check chain on lower draft links loose
until final adjustments are made and the plough is follow-
ing the tractor correctly.
RAISING & LOWERING
The plough is raised and lowered by operating the tractor
three point linkage. On tractor equipped with position and
draft control system, use position control to raise or lower
the plough.
LEVELLING THE PLOUGH
The plough is levelled side ways by means of the adjust-
able vertical link attached to the right lower draft link of
the tractor. The fore and aft levelling is done by adjusting
the top link length of three point linkage on the tractor.
WIDTH ADJUSTMENT
Rotation of rockshaft changes the configuration of plough
bottom with reference to the tractor and adjust the width
1
OPERATION GENERAL

Disc Plough 2
OPERATION GENERAL
of cut. For detailed adjustments of rockshaft refer to in-
dividual instructions of the plough operation.
FURROW WIDTH
Maximum furrow width obtainable in the ploughs are 304.8
mm per bottom. The width of cut of the furrow is varied
by means of the stub beam attaching holes provided in
the main frame and shift of each hole will result in 50.8
mm displacement of the plough bottoms sideways.
Hence the width of cut can be changed in steps of 50.8
mm for a maximum of 12.
BE SURE THAT ALL FURROWS ARE SET TO CUT THE SAME
WIDTH.

Disc Plough
1. Rockshaft Adjustment
There are two adjustments that should be done on rock-
shaft
a) Lateral or positional adjustment
b) Rotation of rockshaft
Lateral or positional adjustment of the rock shaft is done
by loosening 4 nuts marked B1 in figure 1 fixed on ‘U’
bolts on rockshaft clamps and two nuts marked B2 fixed
on ‘U’ bolt on arm rockshaft and moving the rockshaft
sideways. This adjustment is to be done initially before
the plough is attached to the tractor. This is only a guide
line for location of rockshaft and final adjustments have
to be done in the field, depending upon the width of cut
of front furrow.
Rotation of rock shaft changes the configuration of the
plough bottoms with reference to the line of motion of
tractor and thereby affects the width of cut of front fur-
row. The adjustment is done by loosening 4 nuts marked
B1 in illustration 3 and rotating the rockshaft with the
help of width control crank marked ‘C’ in figure 1.
C
B1 B
B2
Figure 1
ADJUSTMENTS
3

Disc Plough
Adjustment of rockshaft will have effect on width of the
front furrow. After commencing the second round of
ploughing check the width of cut of front furrow. The width
of cut of the front furrow is affected when the lead of the
rear furrow is altered. Adjusting the lead towards the fur-
row wall will increase the width of cut of the front fur-
row, whilst away from the wall will decrease the width of
front furrow.
If too wide or too narrow, loosen the rockshaft clamp bolts
and move the plough along the rockshaft to the right or
left as required.
ADJUSTMENTS
4

Disc Plough
The rockshaft must be adjusted so that the rear landside
A. Illustration 5 operates with just light pressure against
the rear furrow wall. This ensures that side draft is di-
vided between the plough and the tractor and a good job
of ploughing can be done.
If the landside is set with too much pressure against the
furrow wall there will be excessive side draft on the plough.
This increases the load on the tractor and causes the
landside to wear rapidly. If the landside is set with no
pressure against the furrow wall there will be excessive
side draft on the tractor making if difficult to steer and
poor quality work will result.
Figure 2
ADJUSTMENTS
5

Disc Plough
Before the best ploughing can finally be achieved correct
assembly and an average operating position must be at-
tained. The aim must be that the plough follow the trac-
tor with both check links floating. If either link are tight,
undue load will be placed on the plough, tractor and op-
erator.
Adjustments must be made individually and their effect
studied before making the next adjustment. To set the
plough for average conditions, proceed as follows:
1. Disc undercut Angle: Undercut settings
6o- for hard going
13o- 18ofor average going
23o- for easy going
Bolt disc bearing bracket to stub beam using holes ac-
cording to undercut required. See Figure 3.
CAUTION : When maximum undercut is required be sure
that interference does not occur between the front disc
and the tractor drawbar. If Interference does occur, the
tractor drawbar must be removed. Figure 3
OPERATION DISC PLOUGH
Choice of disc undercut angle depends on the soil condi-
tions.
6
13°
18°
6°
23°

Disc Plough
2. Furrow Width
Adjust furrow width as follows:
254 mm cut for normal work.
304.8 mm Cut is used when soil conditions are soft and
furrowing does not produce a detrimental condition.
3. Tractor Links
When operating on tractors equipped with draft con-
trol, always use the lower point on the tractor.
4. Levelling the plough (See page 1).
5. Rockshaft
Set the rockshaft in the vertical position, check width
of front furrow, and adjust if necessary.
6. Rear furrow wheel
Setscrews in the rear furrow wheel axle bracket, pro-
vide adjustment for moving the rear furrow wheel to
the right or left, to a position that will ensure the wheel
runs where required In the furrow.
SPRING
ROD
SPRING
RETAINER
NET
SETSCREWS
FOR ADJUSTING
LOCK
NUTS}
SETSCREWS
FOR ADJUSTING
FURROW
WHEEL LEAD
SCRAPER BLADE
BOLTS
FURROW WHEEL
Figure 4
OPERATION DISC PLOUGH
7
WHEEL
RIGHT
OR LEFT

Disc Plough
OPERATION DISC PLOUGH
8
Set the wheel to run with a slight amount to lead away
from the furrow wall. To adjust the lead of / the fur-
row wheel, loosen the bolts and later the angle, at
which the wheel runs, by means of the setscrews.
This adjustment will alter the width of the front fur-
row. Check and reset the rockshaft if necessary to ob-
tain correct width of cut on front furrow.
Set the height of the rear furrow wheel so that the
edge of the disc is from 25.4 mm to 50.8 mm below
the level of the bottom of the discs. To set the height,
slacken locknut and screw head of spring rod to raise
or lower the disc as required. When the desired set-
ting is obtained tighten lower locknut against the spring
rod pivot.
Tension the rear furrow wheel spring by adjusting the
spring retainer nut. After obtaining the desired ten-
sion, lock the spring in position by means of the upper
lock nut.
Excess spring tension tends to lift the disc, while too
little tension will allow the plough to ride on the discs
and cause excessive side draft.
Under hard ground conditions, spring pressure setting
is critical for reducing side draft. Set the furrow wheel
scraper blade to clear both the furrow wheel and the
furrow wheel disc. Adjustment If made by means of
the bolts in the furrow wheel scraper blade. Set the
blade as close as possible to the wheel and disc, en-
suring that contact Is not made when the wheel re-
volves through a full turn.
Rear furrow wheel Adjustments
To assists in reducing side draft:
1. Ensure that the front furrow is not cutting overwidth.
2. Ensure that the front furrow is not deeper than re-
maining furrow, See ‘levelling the plough’.
3. Increase furrow wheel lead.
4. Increase furrow wheel spring pressure.
5. Move furrow wheel across furrow to the left.
To assist Penetration:
1. Increase furrow wheel lead
2. Move furrow wheel to the left.

Disc Plough
OPERATION DISC PLOUGH
9
3. Use minimum spring pressure.
Before final adjustments can be made to the plough, It
must be understood that the most important adjustments
are disc undercut angle and breast cut angle. If these are
not correct, all other factors, such as weight, and rear
furrow wheel cannot be used be best advantages.
Final adjustment
If the undercut angle is too low, excessive penetration
and side draft may result.
If the undercut angle is too high poor penetration may
result with tendency for plough to run from the furrow
wall.
If when set on minimum undercut, good penetration Is
not achieved, lower the draft link point on the tractor.
If the plough cannot be made to penetrate after making
these adjustments, see instruction on hard ploughing.
Having achieved the desired penetration make sure the
plough is level and that the front furrow is not overwidth.
Breastcut adjustment, made by rotating the rockshaft,
Rear Furrow Wheel Adjustment performed with careful
consideration of plough levelness and Front Furrow width,
are the means of obtaining final adjustment.
Moving the rear of the plough to the left decreases breast
cut which reduces draft.
Also, this adjustment increases ploughing furrow width.
In hard ground, if may be necessary to reduce ploughing
furrow width to gain effective breast cut adjustment.
Moving the rear of the plough to the right increases breast
cut which increases side draft. The adjustment of the rear
furrow wheel helps control side draft and penetration.
By increasing furrow wheel lead, spring pressure, or by
moving the furrow wheel across the furrow to the left,
side draft is reduced.
By altering spring pressure and / or raising or lowering the
furrow wheel, penetration is controlled. When satisfac-
tory final adjustment has been achieved adjust check links
on tractor 3 point linkage lower links to permit a small
amount of side movement of the plough.
Hard ploughing conditions
If due to soil conditions good penetration cannot be

Disc Plough
Figure 5
Plough
weights Main Frame
Spindle
Rockshaft
Stub
Beam
Rear
Stub
Beam
Front
Bearing
BKT
Bracket
Scrapper
Scrapper
OPERATION DISC PLOUGH
10
achieved by normal adjustments, the operator is advised
to adopt the following procedure, testing between each
stage.
Note : All adjustments are more critical in hard ploughing
condition:
1. Reduce the cutting width and set the discs at mini-
mum undercut of 6 deg. If at this undercut setting,
penetration is excessive increase undercut angle.
2. Reduce the number of discs, set the plough at Its nor-
mal cutting width and proceed as below.
3. If after making the above adjustments, penetration Is
not completely effective, lower the draft link points
on the tractor.
4. If penetration is still lacking, add beam weights.
Frame Weights
50 kgs plough weights (Figure 5), available as special equip-
ment may be used in extremely hard soil conditions where
additional weight is necessary for penetration. Either one
or two of these weights may be used.

Disc Plough
Scrapers are standard equipment on the plough.
To adjust the setting of the scraper In relation to the disc,
loosen the nut on the eyebolt and turn the scraper adjust-
ing block ‘K’ (Figure 6) as required to move the scraper
closer to or away from the disc.
The inner edge of the scraper may be set closer or further
away from the centre of the disc by means of the notches
of varying depth provided in the scraper adjusting block
for the scraper shank.
Normal setting is to have the inner edge of the scraper
extended practically to the centre of any nearly touching
the disc. The outside edge is given clearance from the
disc. If conditions become wet or sticky set the scraper
close to the face of the disc. If this is not done, the soil
will build up and gradually force the scraper away.
Figure 6
SCRAPPERS (SPECIAL)
11

Disc Plough
IMPORTANT :- Make an Adjustment at a time and study its effect. The trouble can be rectified by using only one
of the suggested remedies.:
Disc Plough
1. Plough won’t penetrate ... (a) Reduce undercut
(b) Lower draft link hitch point on tractor
(c) Reduce furrow wheel spring pressure
(d) Reduce width of cut
(e) Add frame weights
2. Front furrow too wide (a) Adjust plough rockshaft sideways
(If front furrow is too (b) Increase furrow wheel lead
narrow the reverse applies) (c) Move furrow wheel to the left
(d) Check tractor wheel settings.
(e) Check sub beam location.
TROUBLE SHOOTING
12

Disc Plough
3. Side draft excessive .... (a) Increase undercut
Before making any adjustments, ensure that (b) Reduce breast cut
excess side draft is not caused by lack of (c) Correct width of cut of front furrow
penetration, as this will require (d) Level plough to even depth
adjustments as per (1) (e) Increase furrow wheel lead
Plough won’t penetrate (f) increase furrow wheel spring pressure
(g) Reduce disc size
(h) Add frame weights
TROUBLE SHOOTING
13

Disc Plough
Remove all wires and arrange parts conveniently.
Oil all bearings and moving parts as you proceed and see
that they work freely.
Bolts must be used in the holes In which they are found,
or in parts to which they are attached to the plough in the
order numbered.
Whenever the terms ‘left’ and ‘right’ are used, It should
be understood to mean from a position behind and facing
the plough.
After the plough has been set up, go over It carefully to
see that all nuts, set screws and lock nuts are thoroughly
tightened and all cotters are in place and spread.
To ensure that maximum use is made of high tensile bolts
supplied, the following torque ratings are recommended.
SETTING UP INSTRUCTIONS
14
Location Torque Nm
Nuts, and bolts - rockshaft clamp 162
Mold Board beam - frame 203
Stub beams - frame 203
Bracket, disc bearing - upper 203
Bracket, disc bearing - lower 325
Bolt disc attaching 75-81