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
Blades:
2 steel,
20-1/2" length, 3/16" thick
hi-strength,
hi-lift,
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).
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:
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.
15840E1 Front Drive Kit
11601E1 Front Adapter Kit
810-812-814-816S:
19075E1 Front Drive Kit
11601E1 Front Adapter Kit
3. Height: 15-1/2" Weight: 182 lbs.
Length: 34-3/4" Width: 42"
Cutting Width: 40"
Recommended optional equipment for special
applications:
Deck: Reinforced, welded steel.
Drive: Right angle bevel gear, tapered roller
bearings, cast iron housing, 2 self
adjusting spring tensioned V-belts.
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
1
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ASSEMBLY
1.
2.
3.
Unpack the drive and deck.
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.
Remove the belt covers, fig 1, Items 27.
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.
fig 4
8.
9.
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.
fig 2
4.
Set the belts as in fig 3; low belt first. This belt
positioning is important for ease of assembly.
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.
fig 3
5.
6.
Hook the springs to the idler assembly from
underneath as in figs 2 & 4, solid lines.
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.
3
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fig 5
21
22
23
24
12862P1 Gear, Bevel
120502 Key, Woodruff 3/16 x 7/8 Hard
13187P1 Ring, Retaining
ITEM
N0.
PART N0. DESCRIPTION
181618 Bolt, Hex 5/16-24 x 1-3/4
13412P1 Nut, Lock Esna 5/8-18 Light Thin
12871P1 Spring
12867P1 Plate, Dog
12870P1 Washer, Friction
12869P1 Plate, Drive
1
2
3
4
5
6
7
8
9
14101P1 Shim, Gear .020
12490P1 Shim, Gear House .005
12491P1 Gasket
10499P1 Plug, Pipe 2 In. W/Filler Plug
9236P1 Housing, 42 In. Mower
103877 Plug, Pipe 1/8 In. Sq. Hd.
119120 Pin, Cotter 3/32 x 1-1/4
125384 Nut, Slotted 5/8-18 Hex Thick
12850P1 Gear, Bevel
25
26
27
28
29
30
31
32
33
12868P1 Plate, Back
18277P1 Nut, Lock Esna 5/16-24 Light Thin
13143P1 Bearing, Race
13144P1 Bearing, Cone
13122P1 Seal, Oil
12550P1 Retainer, Oil Seal
11815P1 Shaft, Housing
9229P1 Bolt, Hex Special
12852P1 Shim, Gear
10
11
12
13646P1 Shim, Gear .010
13142P1 Bearing, Roller Cone
13139P1 Bearing, Roller Cone
13171P1 Seal, Oil (Dual Lip)
11363P1 Shaft, Drive Rotor
11366A1 Plate, Mounting Weldment
120384 Washer, Lock 1/2 Spring
120378 Nut, Hex 1/2-13
34
35
36
37
38
39
40
41
42
13 94110100 Fitting, Lube 1/8
14
15
16
17
18
19
20
435507 Nut, Lock 1/2-13 Washer Insert Hex
180193 Bolt, Hex 1/2-13 x 3-3/4
180122 Bolt, Hex 3/8-16 x 1
138542 Washer, Lock 3/8 Int Tooth
12023P1 Casting, Swivel
12566P1 Shaft, Drive
13145P1 Bearing, Roller Race
13146P1 Bearing, Roller Cone
11364P1 Sheave, Drive
11365P1 Nut, Special
NS 10102A1 Attachment Clutch Assembly
ILLUSTRATED PARTS LIST (Cont.)
4
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3.
4.
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.
2.
3.
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.
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.
RIDING TRACTORS:
The mower attaches to the Front Adapter Kit with
2 nuts and 2 bolts. Do not damage the threaded
studs, fig 8.
fig 8
SAFETY
fig 6
DRIVE UNIT
1.
REFER to the tractor Owners Manual to
familiarize yourself with all controls before
operation.
INSTALLATION
1.
Before attaching or detaching the mower,
STOP the engine, put the PTO control in the
"OUT" position.
2.
3.
DO NOT ALLOW PASSENGERS to accompany
operator at any time.
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.
6.
7.
8.
USE EXTREME CAUTION when operating on
slopes.
REDUCE SPEED on all side slopes and sharp
turns.
DO NOT OPERATE equipment except from
proper operator's position.
KEEP SAFETY devices and shields in place at
all times.
fig 7
5
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REMOVAL FROM TRACTOR
1.
Reverse the procedure for attaching; see
INSTALLATION, paragraphs 1 through 3.
ADJUSTM ENTS
1.
2.
SWIVEL ACTION: The swivel action is regulated
9.
DISENGAGE POWER to attachment and stop
engine prior to making any adjustment or clearing
the unit.
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.
10. DO NOT WEAR LOOSE fitting clothing.
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.
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).
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.
2.
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
ROUTINE MAINTENANCE
1.
2.
Perform the lubrications as described in
LUBRICATION, paragraphs 1 through 4.
Check each rotor shaft nut to insure tightness fig
1 , Item 15. See ADJUSTMENTS, paragraph 6.
4. BLADE SHARPENING: Sharpen the blades.
Balance after sharpening.
3.
4.
5.
Check all nuts and bolts to insure tightness.
Sharpen and balance the blades.
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.
Clear the mower of cuttings and debris.
6
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9.
Safety clutch action is regulated by the
6.
7.
BLADE INSTALLATION: Place the blade and
collars on the shaft at the desired cutting height.
Put the flat washer and nut on as in
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
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
STORAGE
1.
Perform all that applies from ROUTINE
MAINTENANCE and LUBRICATION.
11367E1 Wrench or any 16" length handle
wrench when used by an average man, fig 9.
2.
Apply a light coat of oil to preserve finish and
appearance.
8.
BELT INSTALLATION: See ASSEMBLY
paragraphs 4, 6, 7, 8, and 9 .
7
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