IM25
INFIELD MOWER
OWNER’S MANUAL
700 Raymond Ave., P.O. Box 14299, St. Paul, Minnesota 55114-0299, U.S.A.
Phone (651) 646-4079 – Fax (651) 646-2887
NATIONAL MOWER CO.
JANUARY – 2000
Download from Www.Somanuals.com. All Manuals Search And Download.
Operating Instructions
1. Unlock Parking Brake (9, Fig. A) by moving lever
forward.
2. Pull Drive Bail (15, Fig. A) slowly back to handle to
moveforward. CAUTION:Makesureyourpathis
clearbeforemovingforward.
3. Adjust Throttle Control to desired mowing speed.
4. Engage Reel Drive Lever (16, Fig. A and B) to start
mowing.
Reel blades are sharp! Never attempt to
adjust cutting height of reel to bed knife
while the engine is running.
5. Release drive bail slightly from handle to disengage
reel.
6. Release drive bail completely to stop the mower
forwardmovement.
7. To shut off mower, pull throttle control all the way
back to “slow”, push ignition switch to “off” and
engageparkingbrake.
2. Adjust cutting height by loosening the top and
bottom Adjusting Nuts (20, Fig. C) which hold roller
adjusters for the Front Roller (21, Fig. B). It is
important to get roller adjusted the same height on
each end so that there will be uniform cutting the
entire width of the mower. Do not adjust by sight.
3. After loosening adjusting nuts on each side, place a
board or gauge plate of the desired height under bed
knife back bar and then tighten nuts.
Maintenance
GENERAL
1. Empty basket of clippings periodically to prevent
spilling.
REELTOBEDKNIFE
The Reel Adjustment Bolt (22, Fig. C) regulates the
distance from the bed knife. To reduce the distance, turn
the locking hex nut on each side of the reel up. Proceed
slowly and do not over adjust. Turn about 1/8 of a turn to
start with. Do not get the reel so tight that it is hard to
turn by hand. A too tight reel will cause excessive wear.
The reel should “wipe” or lightly touch the bed knife.
Check to see that the blades are cutting the paper all
the way across. Tighten lock nuts.
2. After each mowing session, clean clippings out of
basket, off reel and all other surfaces to prevent
corrosion.
3. Inspectreelandbearingsurfacesforforeignmaterial
that might prevent reel from rotating freely and clean
as necessary.
4. Followenginemanufacturer’srecommendations
carefullytoprolongenginelife.
LUBRICATION
There are Zerk Grease fittings (17, Fig. B) on each
end of the reel and on each Roller Adjuster (18, Fig. C).
Use a lithium base type grease at these locations every 8
hours of operation. Use a light machine oil at all pivot
pointsevery30hoursofoperation.
Useheavyglovesandbecareful—blades
aresharp.
Adjustments
CONTROLS
REELENDPLAYADJUSTMENT
As the reel is used, normal wear of the reel bearings
will cause end play. This condition could cause uneven
wear to moving parts and uneven cutting of turf.
Adjustment of control cables have been made at
the factory before shipment. If additional adjustment is
needed, move adjusting nuts at the machine end of the
cables.
Test for end play periodically by trying to move the
reel from side to side in the frame. If there is any move-
ment, adjust by loosening the lock nut (23, Fig. B) on the
adjustment bolt, located inside the right end of the reel.
Turn adjustment bolt “in” one half turn or less. Do not over
tighten as this will cause excessive bearing wear. Test
again for end play. If reel is rotating freely and no end
play can be detected, retighten the lock nut on the
adjusting bolt.
HEIGHTOFCUT
Cutting height should be preset by the dealer
according to ordering instructions prior to delivery. If a
change in cutting height is required, the following proce-
dure must be followed:
1. TherearetwopositionsavailablefortheRearRoller
Assembly (19, Fig. A). The bearings for the rear
roller shaft must be located in the lower position if
the cutting height is over 1” and the upper position if
the cutting height is 1” or less. Disassembly of the
rear roller assembly is necessary to change the
bearing location. See Figure 4 for reference.
4
IM25OM-1/2000-250
Download from Www.Somanuals.com. All Manuals Search And Download.
NATIONAL® IM25 Infield Mower
FIGURE A
FIGURE B
FIGURE C
5
Download from Www.Somanuals.com. All Manuals Search And Download.
Backlapping
Backlapping is a very important step in maintaining
Be extremely careful not to let the brush, your
fingers or your clothing get caught in the reel.
Use approved safety glasses and gloves to
protect you from flying particles and abrasives.
sharp reel blades on the mower. This procedure should
be performed when the reel blades and bed knife become
slightly rounded and the turf is not cut cleanly after a
slight bed knife adjustment. Also, after grinding the bed
knife and reel, backlapping should be done to establish a
perfect match between the be knife and the reel blades.
The reel must run in a reverse direction to be backlapped.
1. Make sure to adjust the reel to the bed knife so that
the reel is level with the bed knife and light contact
is maintained.
2. Remove the Right Side Guard (24, Fig. A).
3. Raise the mower up off the ground until the rear
roller clears the ground as shown in Figure D.
4. Loosen Hex Nut (25, Fig. C) on the back lap
assembly, pivot assembly rearward and tighten hex
nut as shown in Figure D.
Many types of compounds are available for lapping.
We recommend a good pre-mixed water soluble com-
pound. Pre-mixed compound saves time required to mix,
eliminates abrasive waste, rinses off with water and is
available In all grit ranges from course to fine.
7. Stop the reel and examine both the bed knife and
reel blades to see that the cutting edges uniformly
sharp. If not, gradually tighten reel adjuster bolts
(see Reel To Bed Knife Adjustment) and then
repeatStep6aboveuntilachievingtheproper
sharpness.
8. Rinse off the compound thoroughly with water to
removeallabrasive.
5. Start engine and run at half throttle. Engage drive
clutch.
6. With reel running, apply lapping compound to the
reel with a 2” or 3” brush. Apply compound evenly to
themovingblades.
9. Loosen the hex nut on the backlap assembly and
pivotassemblyforwardtodisengagerearroller.
Tighten nut in the position shown in Figure E.
10. Lower machine to the ground and replace right side
guard.
Backlapping gears are shown
engaged.Thegearsmustbein
thispositionwhenbacklapping.
FIGURE D
Raise mower up until drive roller
clears the ground.
Backlappinggearsare
shown disengaged.
The gears must be in
this position when
mowing.
FIGURE E
6
IM25OM-1/2000-250
Download from Www.Somanuals.com. All Manuals Search And Download.
NATIONAL® IM25 Infield Mower
PARTS LIST
Note: For your records and future ordering, fill in the following information.
DATEPURCHASED
MODEL NO.
SERIAL NO.
ORDERING INFORMATION
Whenorderingreplacementparts,alwaysfurnish:
1. Your complete name, address and phone number.
2. Model Number and Serial Number (located on the rear side of the
top plate).
3. PartNumber(itisrecommendedthatthecorrectnumberbeverified
with a current Master Price List).
4. The full Description of the part.
5. Quantity desired (quantity shown is the total number of parts con-
tained in the particular view shown).
If the Part Number and the Description of your order do not
agree, the Part Number will be used to fill your order.
7
Download from Www.Somanuals.com. All Manuals Search And Download.
FIGURE 1
8
IM25OM-1/2000-250
Download from Www.Somanuals.com. All Manuals Search And Download.
NATIONAL® IM25 Infield Mower
FIGURE 1 — MAIN ASSEMBLY
Item
Part No.
Description
Qty.
1
2
400115
09201
09200
200509
400114
HANDLE BAR, Upper
CONTROL, Reel
1
1
1
1
1
3
4
5
______________________________________________C__O__N__T_R__O__L__C__A__B_L__E_,__R_e__e_l__________________________________________________________________
LEVER, Brake
HANDLE BAR, Lower
6
7
08083
400201
ADJUSTMENT ROD, Handle Bar
BAIL
2
1
__________________________________________________________________________________________________________________________________________
8
09198
09199
CONTROL, Throttle
CONTROL, Drive
1
1
9
__________________________________________________________________________________________________________________________________________
10
08085
ROD, Brake
1
11
07024
KNOB, Brake Lever
1
1
1
1
1
1
1
1
1
1
4
1
1
2
2
1
1
1
1
1
8
8
1
1
1
1
1
1
_1__2___________________________________________________________________________________________________________________________________________
13
14
_1__5_________________________________________________________________________________________________________________________________________
16
17
_1__8___________________________________________________________________________________________________________________________________________
19
20
_2__1__________________________________________________________________________________________________________________________________________
22
23
__2_4__________________0__5_0__0_2_____________________________________________________________________________________________________________________
25
26
_2__7__________________________________________________________________________________________________________________________________________
28
29
_3__0___________________________________________________________________________________________________________________________________________
31
32
04520
400069
400040
07503
400041
07502
400205
400024
400017
200676
400100
400102
SPRING, Brake Rod
RETAINER, Clutch Cable
COUNTERSHAFT, See Figure 2
CHAIN, Roller
COUNTERSHAFT, See Figure 3
CHAIN, Reel
GUARD, Clutch
PIVOT,Brake
BRAKE
BUSHING
CLUTCH, See Figure 5
PLATE, Top
PIN, Handle Bar
BRACKET, Handle Bar Pin
GUARD, Left Inside
GEAR, Roller, 36 Tooth
SPROCKET, Roller, 28 Tooth
ROLLER ASSEMBLY, Rear, See Figure 4
GUARD, Left Side
NUT, Bed Bar
SCREW, Bed Bar
BED BAR, with Bedknife
BEDKNIFE,Only
SPROCKET, Reel, 11 Tooth
400117
400319
400093
400092
400038
400070
201802
02109
__3_3__________________3__0_2__3_1__1___________________________________________________________________________________________________________________
302310
03114
400029
302846
400061
34
__3_5____________________________________________________________________________________________________________________________________________
36
37
BRACKET, Basket, Left Side
ADJUSTER, Roller, Left
SIDE PLATE, Left
_3__8___________________________________________________________________________________________________________________________________________
400035
400008
06102
CARRIER, Reel, Left
ADJUSTER, Reel
BEARING, Tapered Roller
1
2
2
2
2
2
39
40
41
42
43
06121
03508
201437
________________________________________________R__A__C__E__,_T__a_p__e_r_e_d___R__o_l_le__r_______________________________________________________________________
SEAL, Reel Carrier
TAKE-UP, Reel Bearing
44
45
400094
302491
________________________________________________S__H__I_E_L__D__,_F__r_o_n_t__T__h_r_o_w__________________________________________________________________________
1
REEL, 6 Blade
1
302738
400322
REEL, 8 Blade
ROLLER, Shallow Groove
1
1
__4_6____________________________________________________________________________________________________________________________________________
400442 ROLLER, Deep Groove
400460 PIN, Basket
_4__8__________________0__7_3__3_8____________________B__A__S_K__E_T_______________________________________________________________________________________
302847 ADJUSTER, Roller, Right
400034 CARRIER, Reel, Right
400075 SIDE PLATE, Right
400030 BRACKET, Basket, Right
400078 GEAR, Reel, 24 Tooth
400071 GUARD, Right
400104 BACKLAP GEARS, See Figure 6
400471 ADJUSTING PLATE, Engine
03638 PULLEY, Engine, Inside
03939 BELT, Gates #6832
400320 GUARD, Right Inside
07513 ENGINE, Briggs & Stratton, 3.5 H.P.
200256 ADJUSTING SCREW & NUT
06136
1
47
2
1
49
50
1
1
1
_5__1________________________________________________________________________________________________________________________________________
52
1
53
1
1
_5__4________________________________________________________________________________________________________________________________________
55
1
56
1
1
_5__7_________________________________________________________________________________________________________________________________________
58
2
59
1
1
_6__0_________________________________________________________________________________________________________________________________________
61
1
62
BEARING
6
9
Download from Www.Somanuals.com. All Manuals Search And Download.
FIGURE 2—GROUND DRIVE COUNTERSHAFT ASSEMBLY, 400040
Item
Part No.
Description
Qty.
1
2
3
03117
03634
06136
SPROCKET,14Tooth
PULLEY
1
1
2
BEARING
___________________________________________________________________________________________________________________________________________
4
5
6
400020
400063
400069
PLATE, BearingCarrier,Short
PLATE,BearingCarrier,Long
RETAINER,ClutchCable
1
1
1
____________________________________________________________________________________________________________________________________________
7
8
400095
202436
COUNTERSHAFT,RollerDrive
Key, #9Woodruff
1
1
10
IM25OM-1/2000-250
Download from Www.Somanuals.com. All Manuals Search And Download.
NATIONAL® IM25 Infield Mower
FIGURE 3—REEL DRIVE COUNTERSHAFT, 400041
Item
Part No.
Description
Qty.
1
2
3
202839
03634
06136
SPROCKET,24Tooth
PULLEY
1
1
2
BEARING
___________________________________________________________________________________________________________________________________________
4
5
6
400020
400063
400069
PLATE,BearingCarrier,Short
PLATE,BearingCarrier,Long
RETAINER,ClutchCable
1
1
1
___________________________________________________________________________________________________________________________________________
7
8
400096
202436
COUNTERSHAFT,ReelDrive
KEY, #9 Woodruff
1
1
11
Download from Www.Somanuals.com. All Manuals Search And Download.
FIGURE 4—REAR ROLLER ASSEMBLY, 400038
Item
Part No.
Description
Qty.
1
2
3
400037
400097
400013
TUBE, Roller
SHAFT,Roller
RING, Pinion
2
1
2
___________________________________________________________________________________________________________________________________________
4
5
400014
04531
09077
202436
06140
02502
RETAINER,Pinion
SPRING, PinionPawl
2
2
2
2
4
1
6
7
8
9
______________________________________________P__A__W__L__,_P__i_n_i_o_n__________________________________________________________________________
KEY, #9 Woodruff
BEARING
WASHER
12
IM25OM-1/2000-250
Download from Www.Somanuals.com. All Manuals Search And Download.
NATIONAL® IM25 Infield Mower
FIGURE 5—CLUTCH ASSEMBLY, 400100
Item
Part No.
Description
Qty.
1
2
400044
400099
400080
03608
200676
BRACKET,MowingClutch
BRACKET, ClutchMount
1
1
1
2
2
3
4
5
______________________________________________B__R__A__C__K__E__T_,_T__r_a_n__s_p__o_r_t_C__l_u_t_c_h_____________________________________________________________
PULLEY
BUSHING
13
Download from Www.Somanuals.com. All Manuals Search And Download.
FIGURE 6—BACKLAP GEAR ASSEMBLY, 400104
Item
Part No.
Description
Qty.
1
2
400106
400105
02502
04020
400109
BRACKET
GEAR, with Bushing, 24 Tooth
1
2
4
2
2
3
4
5
______________________________________________W___A__S_H__E__R___________________________________________________________________________________
LOCKRING,3/4”
PIN, Gear
6
02148
______________________________________________S__C__R__E__W__,__F_l_a__t_H__e_a__d__S__lo__t_te__d_,__5_/_1_6__”_–_1__8__X__3__/_4_”__________________________________________
2
7
8
200676
02034
02403
BUSHING
CAPSCREW,3/8”–16X3/4”
1
1
1
1
9
______________________________________________W___A__S__H__E_R__,__F_l_a__t,__3_/_8_”______________________________________________________________________
10
02303
LOCKWASHER,3/8”
14
IM25OM-1/2000-250
Download from Www.Somanuals.com. All Manuals Search And Download.
NATIONAL® IM25 Infield Mower
NATIONAL MOWER COMPANY
ONEYEAR
LIMITED WARRANTY
For the period of one year from the date of purchase (45 days if the product
is used for rental purposes), National Mower Company will repair or replace free
of charge, for the original purchaser, any part or parts found by inspection to be
defective by our Factory Authorized Service Station or by the Factory at St. Paul,
Minnesota to be defective in material or workmanship or both. All transportation
charges on parts submitted for repair or replacement under this warranty shall be
paid for by the purchaser.
Thiswarrantydoesnotincludeengines,enginepartsortireswhicharecovered
under separate warranties furnished by their manufacture or supplier.
AllserviceunderthiswarrantywillbefurnishedandperformedbyourFactory
Authorized Service Stations.
-THERE IS NO OTHER EXPRESS WARRANTY-
IMPLIEDWARRANTIES,INCLUDINGTHOSEOFMERCHANTABILITYAND
FITNESS FOR A PARTICULAR PURPOSE, ARE LIMITED TO ONE YEAR
FROM PURCHASE OR 45 DAYS IF THE PRODUCT IS RENTED AND TO THE
EXTENT PERMITTED BY LAW, ANY AND ALL IMPLIED WARRANTIES ARE
EXCLUDED. THE ABOVE REMEDY OF REPAIR AND REPLACEMENT OF
DEFECTIVEPARTSISTHEPURCHASER’SEXCLUSIVEREMEDYFORANY
DEFECT,MALFUNCTIONORBREACHOFWARRANTY.LIABILITYFOR
INCIDENTALORCONSEQUENTIALDAMAGESUNDERANYANDALL
WARRANTIESISEXCLUDEDTOTHEEXTENTPERMITTEDBYLAW.
NATIONAL MOWER COMPANY
700 Raymond Avenue, St. Paul, Minnesota 55414, U.S.A.
15
Download from Www.Somanuals.com. All Manuals Search And Download.
|