Gravely 40 User manual

1
OPERATOR'S
MANUAL
NAME: 40" COMMERCIAL MOWER PART NUMBER(S): 11362 - 40" Commercial Drive
11368 - 40" Commercial Deck
40" COMMERCIAL MOWER ATTACHED TO C12 TRACTOR WITH DUAL WHEELS
GENERAL
1. The 40" Commercial Mower is a front mount unit
designed and built to give many years of excellent
service. The mower is recommended for rough
mowing conditions; has all gear drive from engine to
mower, heavy-duty steel deck, rugged skids and
casters, and 2 adjustable blades. The mower
attaches to both 2 and 4 wheel tractors (see
paragraph 3).
2. The Owners Manual includes the parts list, setting
up the mower, safety, operation, and maintenance
instructions. Use the parts list for reference to
individual part numbers. If further information is
necessary contact the local Gravely dealer.
3. Height: 15-1/2" Weight: 182 lbs.
Length: 34-3/4" Width: 42"
Cutting Width: 40"
Deck: Reinforced, welded steel.
Drive: Right angle bevel gear, tapered roller
bearings, cast iron housing, 2 self
adjusting spring tensioned V-belts.
Blades: 2 steel, hi-strength, hi-lift,
20-1/2" length, 3/16" thick
Features: Adjustable casters, adjustable swivel
action.
Purpose: Heavy mowing conditions.
Recommended for the following tractors:
7.6 - C10A - C12
424 - 430 - 432
810 - 812 - 814 - 816S
Required attaching kits:
7.6 - C10A - C12: None
424 - 430 - 432:
15840E1 Front Drive Kit
11601E1 Front Adapter Kit
810-812-814-816S:
19075E1 Front Drive Kit
11601E1 Front Adapter Kit
Recommended optional equipment for special
applications:
7.6 - C10A - C12: None
Riding Tractors:
20181E1 Wheel Brake Kit, 800 Series
11924E1 Front Wheel Weights
Recommend option for riding tractors without
hydraulics:
11271E1 Lift Assist Kit

2
ITEM
N0. PART N0. DESCRIPTION
1 11369A1 Deck Weldment
2 180126 Bolt, Hex 3/8-16 x 1-1/2
3 9231P1 Idler
4 11379A1 Arm, Idler Pivot Weldment
5 11382A1 Idler, Pivot Arm
6 456004 Nut, Lock 3/8-16 Washer Insert
7 11263P1 Spring
8 9200A1 Housing, Spindle Bearing Weldment
9 9246P1 Bearing, Cones
10 9245P1 Bearing, Race
11 9206P1 Seal, Oil
12 9204P1 Ring, Seal
13 9207P1 Pulley, Rotor
14 131001 Washer, Flat 31/32 x 2-1/4 x .165
15 17313P1 Nut, Lock Esna 7/8-9 Heavy Thin
16 9203P1 Shaft, Rotor
17 9213P1 Key, Square 1/4 x 1
18 9205P1 Shield, Dust
19 9211P1 Collar, Blade Spacer 3/4"
20 9210P1 Collar, Blade Spacer 1/2"
21 9209P1 Collar, Blade Spacer 1/4"
22 9212P1 Blade, Mower
23 102581 Screw, Set 5/16-18 x 3/8 Hex Socket
24 94110270 Fitting, Lube 1/4-28
25 120915 Bolt, 3/8-16 x 1 Rd. Hd. Sq. Nk.
26 456004 Nut, Lock 3/8-16 Washer Insert
27 11384P1 Cover, Belt
28 94286380 Bolt, 3/8-16 x 5/8 Hex Hd.
29 120382 Washer, Lock 3/8 Sp.
30 120394 Washer, Flat 13/32 x 13/16 x .065
31 9240P1 Belt, Drive
32 9223P2 Skid
33 181596 Bolt, 5/16-24 x 7/8 Hex Hd.
34 120214 Washer, Lock 5/16 Sp.
35 120393 Washer, Flat 11/32 x 13/16 x .065
36 11376A1 Support, Deck Weldment
37 18549P1 Decal, Danger
38 11375P1 Bearing, Bronze
39 94110270 Fitting, Lube 1/4-28
40 180122 Bolt, Hex 3/8-16 x 1
41 120897 Bolt, 1/2-13 x 3 Rd. Hd. Sq. Nk
42 120384 Washer, Lock 1/2 Spring
43 120378 Nut, Hex 1/2-13
NS 9251A1 Guard, Weldment
45 137204 Pin, Cotter 1/8 x 1-1/2
46 131017 Washer, Flat
47 11385A1 Caster Fork Weldment
48 113871`1 Bushing
49 11386P1 Wheel, Caster
50 180193 Bolt, Hex 1/2-13 x 3-3/4
51 435507 Nut, Lock 1/2-13 Washer Insert
Complete 40" Rotary Mower Spindles R.H. #10398A1 and L.H.
#10399A1 Include Item Numbers 8 through 21 and Numbers 23 and 24 ILLUSTRATED PARTS LIST Continued on Page 4
fig 1

3
ASSEMBLY
1. Unpack the drive and deck.
2. Remove the belt covers, fig 1, Items 27.
3. Mount the idlers on the studs as in fig 2. Note the
different sleeve lengths of the idlers. The short
sleeve goes next to the high rotor and the tall
sleeve goes next to the low rotor. Set the idlers
on the studs with the extended sleeves down.
Work from the rear of the mower.
4. Set the belts as in fig 3; low belt first. This belt
positioning is important for ease of assembly.
fi
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2
fi
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3
5. Hook the springs to the idler assembly from
underneath as in figs 2 & 4, solid lines.
6. Set the drive in position on the deck; do not bolt
it down. Slip the belts on the drive pulley and
then on the rotor pulleys. Let the idlers float at
this time; solid lines, fig 4.
7. Bolt the drive to the deck. The 2 carriage bolts
are inserted from under the deck, fig 1, Items 41,
42 & 43. Be sure that the heads seat properly in
the deck. The 3 hex bolts fasten from the top, fig
1, Items 29 & 40. Start all bolts and nuts before
tightening.
fig 4
8. Working from the sides, grip the springs with a spring
puller or clamp-lock pliers or equivalent. Extend the
spring hook up, over, and through the spring hole.
The belts are now in tensioned running position;
dotted lines fig 4.
9. Replace the belt covers.
10. Install the bushings in the caster wheels and
bolt the wheels in the caster forks.
LUBRICATION
1. Grease the spindle bearing weldment housing through
the grease fitting, with general purpose grease fig 1,
Item 8 & 24. Add grease until it comes out the vent
hole; opposite side of the grease fitting. Re-grease
every 8 HOURS of operation or more often when
operating in severe dust or sand.
2. Grease the bronze bearing and caster wheels through
the grease fittings with general purpose grease fig 1,
Items 38 & 49. Add grease until it comes out the
bearings. Re-grease periodically, especially when
operating in severe dust or sand.

4
ITEM
N0. PART N0. DESCRIPTION
1 181618 Bolt, Hex 5/16-24 x 1-3/4
2 13412P1 Nut, Lock Esna 5/8-18 Light Thin
3 12871P1 Spring
4 12867P1 Plate, Dog
5 12870P1 Washer, Friction
6 12869P1 Plate, Drive
7 12868P1 Plate, Back
8 18277P1 Nut, Lock Esna 5/16-24 Light Thin
9 13143P1 Bearing, Race
13144P1 Bearing, Cone
10 13122P1 Seal, Oil
11 12550P1 Retainer, Oil Seal
12 11815P1 Shaft, Housing
13 94110100 Fitting, Lube 1/8
14 435507 Nut, Lock 1/2-13 Washer Insert Hex
15 180193 Bolt, Hex 1/2-13 x 3-3/4
16 180122 Bolt, Hex 3/8-16 x 1
17 138542 Washer, Lock 3/8 Int Tooth
18 12023P1 Casting, Swivel
19 12566P1 Shaft, Drive
20 13145P1 Bearing, Roller Race
13146P1 Bearing, Roller Cone
21 12862P1 Gear, Bevel
22 120502 Key, Woodruff 3/16 x 7/8 Hard
23 13187P1 Ring, Retaining
24 14101P1 Shim, Gear .020
12490P1 Shim, Gear House .005
25 12491P1 Gasket
26 10499P1 Plug, Pipe 2 In. W/Filler Plug
27 9236P1 Housing, 42 In. Mower
28 103877 Plug, Pipe 1/8 In. Sq. Hd.
29 119120 Pin, Cotter 3/32 x 1-1/4
30 125384 Nut, Slotted 5/8-18 Hex Thick
31 12850P1 Gear, Bevel
32 9229P1 Bolt, Hex Special
33 12852P1 Shim, Gear
13646P1 Shim, Gear .010
34 13142P1 Bearing, Roller Cone
35 13139P1 Bearing, Roller Cone
36 13171P1 Seal, Oil (Dual Lip)
37 11363P1 Shaft, Drive Rotor
38 11366A1 Plate, Mounting Weldment
39 120384 Washer, Lock 1/2 Spring
40 120378 Nut, Hex 1/2-13
41 11364P1 Sheave, Drive
42 11365P1 Nut, Special
NS 10102A1 Attachment Clutch Assembly
ILLUSTRATED PARTS LIST (Cont.)
fig 5

5
3. Remove filler plug and level plug, fig 6 . Fill the
gear drive housing to the oil level plug with SAE
90 gear lubricant. Replace the plugs. Check the
level periodically especially if signs of leakage
are present.
4. Grease the swivel casting through the grease
fitting on the casting with general purpose
grease. Add grease until it comes out under the
swivel adjustment fig 6. Re-grease every 8
HOURS of operation.
2. 7.6, C10A, C12 TRACTORS:
The mower attaches to the front of the tractors
with 2 nuts and 2 bolts. Do not damage the
threaded studs, fig 7.
3. RIDING TRACTORS:
The mower attaches to the Front Adapter Kit with
2 nuts and 2 bolts. Do not damage the threaded
studs, fig 8.
fi
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6
DRIVE UNIT
INSTALLATION
1. Before attaching or detaching the mower,
STOP the engine, put the PTO control in the
"OUT" position.
fi
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7
fi
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8
SAFETY
1. REFER
to the tractor Owners Manual to
familiarize yourself with all controls before
operation.
2. DO NOT ALLOW PASSENGERS to accompany
operator at any time.
3. DO NOT ALLOW CHILDREN to operate
equipment, nor allow adults to operate it without
proper instruction.
4. INSPECT WORK AREA for rocks, glass, metal,
bones, and any other foreign objects. Stay alert
for holes and other hidden hazards.
5. USE EXTREME CAUTION when operating on
slopes.
6. REDUCE SPEED
on all side slopes and sharp
turns.
7. DO NOT OPERATE equipment except from
proper operator's position.
8. KEEP SAFETY
devices and shields in place at
all times.

6
9. DISENGAGE POWER
to attachment and stop
engine prior to making any adjustment or clearing
the unit.
10. DO NOT WEAR LOOSE fitting clothing.
11. KEEP HANDS, feet, hair, clothing, etc., away
from moving parts.
12. KEEP BYSTANDERS
and pets removed from the
work area.
13. EXERCISE CAUTION
to avoid slipping or falling,
especially when operating in reverse with two
wheel tractors.
14. DIRECT DISCHARGE
so as not to endanger life
or property; such as people, pets, structures,
cars, etc.
OPERATION
1. Refer to the tractors Owners Manual for safety
and operating instructions to engage and
disengage the PTO (power take-off).
2. Operate the engine at full speed. In thick, lush
growth reduce ground speed (not engine speed)
to allow the mower enough time to cut and
discharge.
REMOVAL FROM TRACTOR
1. Reverse the procedure for attaching; see
INSTALLATION, paragraphs 1 through 3.
ADJUSTM ENTS
1. SWIVEL ACTION: The swivel action is regulated
by the nut and bolt on the swivel casting, fig 5.
Loosening allows more action, tightening reduces
the action. The swivel action should allow the
mower to follow ground contour.
2. CASTERS: The caster wheels should be
adjusted (if necessary) after the mower is
attached to a tractor. Raise or lower the casters,
by use of the spacers, to make the mower level
with the ground, fig 6 , Item 46.
ROUTINE MAINTENANCE
1. Perform the lubrications as described in
LUBRICATION, paragraphs 1 through 4.
2. Check each rotor shaft nut to insure tightness fig
1 , Item 15. See ADJUSTMENTS, paragraph 6.
3. Check all nuts and bolts to insure tightness.
4. Sharpen and balance the blades.
5. Clear the mower of cuttings and debris.
fig 9
3. BLADE REMOVAL: STOP the engine, Put the
PTO in the OUT position. Put the operating levers
in NEUTRAL. BE SURE the blades have stopped.
Remove the mower from the tractor. Turn the
mower upside down. Hold the rotor shaft with a
3/8” socket drive and remove the nut with a
15367E1 Gravely Wrench or equivalent fig 9. Do
not use the top spindle nut to hold the spindle form
spinning
4. BLADE SHARPENING: Sharpen the blades.
Balance after sharpening.
5. CUTTING HEIGHT: Place the collars above and/or
below the blade for adjustment, fig 1, Items 19, 20,
21. Note that the collars are not the same
thickness. Keep the same combination on both
rotors.

7
6. BLADE INSTALLATION: Place the blade and
collars on the shaft at the desired cutting height.
Put the flat washer and nut on as in
7. BELT REMOVAL: Remove the belt covers.
Unhook one end of each spring; use a spring
puller or clamp-lock pliers. Remove the drive.
Remove the belts. See figs 2, 3, & 4. fig 1, Item
14 and 15. Hold the rotor shaft with a 3/8" socket
drive and torque the nut to 100 ft. lbs. Similar
tightness can be reached with a Gravely
11367E1 Wrench or any 16" length handle
wrench when used by an average man, fig 9.
8. BELT INSTALLATION: See ASSEMBLY
paragraphs 4, 6, 7, 8, and 9 .
9. Safety clutch action is regulated by the
attachment clutch assembly, fig 5, Items 1, 3, 4,
5, 6, 7 and 8. Loosen all 6 nuts, Items 8. Tighten
the 6 bolts all the way into the threaded back
plate, Items 1 & 7. Back off each bolt 1/2 turn.
Lock the bolts in position with the nuts
STORAGE
1. Perform all that applies from ROUTINE
MAINTENANCE and LUBRICATION.
2. Apply a light coat of oil to preserve finish and
appearance.