pronovost P-INV-74 Programming manual

P-INV-74
No. C3002 05/2010
OPERATOR'S / PARTS
MANUAL
Snowblowers
Models

Copyright © Les Machineries Pronovost Inc., 2010
All rights reserved.
Printed in Canada.

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TABLE OF CONTENTS
Section Item Page
1 Introduction ................................................................................................................ 5
2 Safety .......................................................................................................................... 6
General Safety .................................................................................................. 6
Safety in Operation ........................................................................................... 6
Safety with Maintenance .................................................................................. 7
Safety in Transport ........................................................................................... 7
Safety in Storage............................................................................................... 7
3 Decals .......................................................................................................................... 8
Safety Decals .................................................................................................... 8
MaintenanceDecals.......................................................................................... 11
4 Assembly .................................................................................................................... 12
Generalassembly.............................................................................................. 12
5 Start-up....................................................................................................................... 13
BasicStart-upProcedures ................................................................................ 13
6 Maintenance .............................................................................................................. 14
7 Storage ....................................................................................................................... 15
8 TroubleShooting........................................................................................................ 16
9 Specifications ............................................................................................................. 18
10 PartsList....................................................................................................................19
SnowblowersP-INV-74 .................................................................................. 19
Semi-industrialChutePSIG-INV-GR1 ............................................................. 22
Options ............................................................................................................ 23
P.T.O.Shaft8114-EG ..................................................................................... 24
GearBox8251 ................................................................................................ 25
Cylinder25TR04.............................................................................................. 26
HydraulicMotorMLH100,MLH125&MLH250 ........................................... 27
11 TorqueChart.............................................................................................................. 28
12 Warranty .................................................................................................................... 29

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INTRODUCTION
NOW take a moment to enter the model, serial
number and the date of purchase of your Snowblower
in the space provided.
When ordering parts from your Dealer, please refer to
these numbers for a fast and efficient service. Use
PRONOVOST parts for replacement.
The model and serial numbers are on the name plate
shown on Fig. 2.
Thank you for choosing PRONOVOST. We are
confident this equipment will meet your requirements
in terms of quality, performance and reliability.
This manual was prepared to assist you in the safe
operation of your new Snowblower. It contains
important information which will help you achieve
excellent returns with your Snowblower for years to
come.
Please read this manual completely before operating
your Snowblower and keep it for future reference.
Before starting the machine, you or any other person
who will be operating the Snowblower must
familiarize yourself with the safety recommendations
and the operating instructions. Please read carefully
and be sure to understand and follow all
recommendations and procedures.
In this manual, the right and left sides are identified as
shown on Figure 1.
If you require additional information on your
Snowblower, please contact your PRONOVOST
Dealer.
CONGRATULATIONS! 1
Figure2
MODEL: 
SERIAL NO: 
DATE OF PURCHASE: 
RightLeft
Figure1

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WHEN YOU SEE THIS SYMBOL
SAFETY
ATTENTION!
BE ALERT
YOUR SAFETY IS INVOLVED
This symbol «SAFETY ALERT» is used in this manual and
on the safety decals on the Snowblower. It warns you of the
possibility of danger. Carefully read, understand and follow
all safety recommendations before operating the
Snowblower.
1) Careful operation is the best assurance against acci-
dents. Carefully read this manual and follow all
recommendations before operating your Snowblower.
It is the owner’s responsibility to make sure that anyone
who will operate the Snowblower will read this manual
before operating the equipment.
2) Familiarize yourself with all controls and always be
ready to stop the Snowblower quickly in case of
emergency.
3) Never let a child operate the Snowblower.
4) Do not modify the Snowblower. Any non authorized
modification may affect the efficiency and/or safety of
the equipment and will automatically void the warranty.
5) Never operate the Snowblower with defective parts or if
damaged in any way. Have it repaired before operating.
6) Make sure all fasteners are in place and properly
secured or tightened. Refer to torque chart on page 28.
7) Avoid wearing loose fitting clothing when working with
the Snowblower. These could get entangled in moving
parts of the equipment and cause accidents.
GENERAL SAFETY
8) Prolonged exposure to noise may hamper hearing.
Protect yourself by wearing adequate protection
devices.
9) Hydraulic fluids under pressure can damage your skin.
Do not use your hands to locate a leak.
10) Before the beginning of the snow season, inspect all
areas where the Snowblower will be used and remove
any object which may cause an accident and/or damage
the equipment.
11) Never operate your Snowblower in poor visibility or
without proper lighting conditions.
SAFETY IN OPERATION
1) Be sure there are no obstructions around the equipment
and that no one stands near the equipment when in
operation.
2) Do not operate an engine in a confined or non ventilated
area.
3) Do not perform any adjustments, cleaning, maintenance
or repairs with the engine running. The engine must be
stopped and the P.T.O. disengaged. Preferably remove
the key from the ignition.
4) Wear adequate clothing when working in cold or windy
conditions.
5) Before operating, make sure the P.T.O. is properly
installed and secured.
6) Before starting-up the Snowblower, make sure the auger
and drum areas are free of ice.
7) Put P.T.O. control in neutral position before starting
engine.
8) Keep hands, feet and clothing away from moving parts
of the Snowblower. Stay away from the discharge chute.
2

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SAFETY (cont'd)
9) Before unplugging the chute, always disengage the
P.T.O., stop the engine and relieve all hydraulic pressu-
res.
10) Do not operate in excessive inclined conditions. Be
careful when turning in slopes.
11) Never operate your Snowblower with missing guards or
without protective devices in place.
12) Do not operate your Snowblower near buildings,
windows or other vehicules without prior and proper
adjustment of the chute deflector.
13) Never aim discharge chute towards people or animals.
This may cause serious injuries.
14) Always reduce operating speed in slippery conditions.
15) Be careful when backing-up, make sure you have good
visibility.
16) Always be on the lookout for objects which may enter
theSnowblower.
17) If undue vibrations are felt, disengage the P.T.O., stop
the motor and look for the cause of the vibration.
Vibration is usually the indication of a problem.
18) At the end of the operation, disengage the P.T.O., lower
the Snowblower, put transmission in neutral, apply
parking brake, stop engine and remove the key from the
ignition.
SAFETY WITH MAINTENANCE
1) Perform the Snowblower maintenance according to
recommendations contained in this manual.
2) Stop engine and relieve all hydraulic pressures before
doing inspection, maintenance or repairs.
3) Never perform any work under the Snowblower while it
is supported only by the tractor's hydraulic system. It
must be completely supported by wooden blocks or
other safe means.
SAFETY IN TRANSPORT
1) On public roads, use proper safety lights and check
local regulations.
2) Be alert while driving on the road. Never carry
passengers.
3) Always disengage P.T.O. while moving from one area
of work to another.
4) It is recommended to use both brake pedals
simultaneously for better control.
5) The recommended road speed should be such as to
maintain full control over steering and braking.
6) Be careful while backing up, make sure you have good
visibility.
SAFETY IN STORAGE
1) Provide adequate supports to prevent any accidental
overturning of the Snowblower.
2) Do not let children play in the area where the
Snowblower is stored.
2

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DECALS
SAFETY DECALS
The safety decals are affixed wherever special safety
precautions are indicated. Locate them on the machine
and read them carefully. If a decal is damaged, lost or
illegible, install a new one. The following photos
indicate where each one must be installed.
Figure3
Decal A Part no.: 190-11671
Figure5
Decal C Part no.: A103
Figure4
Decal B Part no.: 190-07722
3
Figure6
BB
A
DC
C

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DECALS (cont'd)
3
Figure9
Figure8
Decal E Pièceno.: 190-07611
Figure7
Decal D Part no.: 190-06651
Figure11
Decal G Part no.: 190-11641
Figure10
Decal F Part no.: 190-11581
E
FG

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DECALS (cont'd)
3
Figure13
Figure12
Decal H Part no.: 190-10991
G
H
Figure14
Part no.: A108

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DECALS (cont'd)
3
Figure16 Part no.: A 106
Figure15
Part no.: A 109
MAINTENANCE DECALS
The maintenance decals indicate the points requiring
lubrication. Refer to maintenance section for more
details.

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ASSEMBLY
ASSEMBLY
1) The Snowblower is shipped partly assembled.
2) Install 3-point system according to the model of
your Snowblower. (See section 10 for parts
numbers). Use the holes most convenient to the
type of tractor used (Fig. 17).
3) Install P.T.O. shaft with the shear pin end onto the
Snowblower gear box. Then attach safety shield
support chain as shown. WARNING: The
telescoping tubes of the drive shaft must never be
allowedtobottomoutwhilemaintainingamini-
mum overlap of 6 inches.
4) If you install a hydraulic cylinder on the chute
deflector, use model 25TR04 cylinder.
5) When installing chute, grease the groove of the
UHMW slide in order to prevent the corrosion of
the rim of the chute.
6) For the installation of the chute rotation
mechanism, please refer to parts section,
according to the type used.
4Figure17

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STARTING-UP
START-UP PROCEDURES
1) Check oil level in gearbox. Adjust to required oil
level as per drawing in Parts List section. Use
SAE80W90 oil.
2) Lubricateall points with a goodquality
multipurposegrease.
3) Check chain take-up adjustment. The spring
maintaining the tension must be compressed to a
length between 3" and 3 1/4" (Fig. 18).
4) Verify for adequate tightness of all fastening
devices. Refer to torque chart on page 28.
5) Make sure of a 540 RPM input to your
snowblower.
6) Check impeller adjustment. The tip of the blades
shouldbe approximately 1/8" to 3/16" from the
discharge wall of the drum. If necessary, adjust
impellerby using both adjustment settings (Fig.19
&Fig. 20)simultaneously.
7) In order to avoid damaging your snowblower,
adjust the speed of descent of your 3 point hitch to
prevent striking the ground too hard.
8) Adjust the hydraulic flow in order to have a good
control of the rotation speed of the chute.
5
Figure18
Figure19
Figure20

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MAINTENANCE
1) Wipe off all grease fittings with a clean cloth
before adding grease in order to avoid injecting
dirt and sand.
2) Repair or replace damaged grease fittings.
3) Lubricate all grease fittings every 8 hours of
operation.
4) Oil drive chain every 8 hours of operation.
5) Lubricate P.T.O. shaft as indicated below:
Pull out the P.T.O. and lubricate between the two
tubes with low temperature grease. Drive line
tubes must slide easily even in cold weather. Clean
off old hardened grease and apply fresh grease as
needed.
6) Check oil level in gear box once a month. Adjust
to required oil level as per drawing in Parts List
section. Use SAE 80W90 oil.
7) Check tension of drive chain every 24 hours of
operation and adjust if necessary.
8) Check for tightness of bearing collars every 48
hours of operation.
9) Change gearbox oil once a year. Adjust to required
oil level as per drawing in Parts List section. Use
SAE 80W90 oil.
10) Check all nuts and bolts once a year. If necessary
use torque chart on page 28.
11) For the auger drive shaft, always use a grade 5
shear bolt.
12) For the PTO shaft, always use a grade 8.8 shear
bolt at 540 RPM.
13) UHMW slides do not require lubrification except
at the end of the season in order to prevent corro-
sion of steel components that are in contact with
the UHMW material.
6

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STORAGE
1) Store the Snowblower in a cool, dry place.
2) Support the Snowblower with wooden blocks.
3) Keep all piston rods in the retracted position. This
will assure better protection against the elements.
4) Clean your Snowblower.
5) Thoroughly inspect all parts of the Snowblower.
Replace or repair worn or defective parts.
6) Touch-up or repaint if necessary.
7) Lubricate all points before storage.
7

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TROUBLESHOOTING
- Follow lubrication
recommendations.
- Replace defective U-joints.
- Make sure the Snowblower inlet
face is perpendicular to the
ground and if possible readjust
3-point hitch in order to position
the Snowblower further away
from tractor.
- Use high quality lubricant.
- Avoid raising Snowblower while
in operation.
- Readjust 3-point hitch in order
to position the snowblower
closer to the tractor.
- Follow lubrication
recommendations.
- Replace defective telescopic
members.
- Clean and grease.
- Readjust 3-point hitch in order to
position the Snowblower further
away from tractor or shorten tu-
bes.
- Follow lubrication instructions.
- Adjust chain to prevent
interference between guard &
equipment.
- Replace worn or damaged
bearing rings.
- Eliminate any interference
between tubes and equipment or
tractor.
- Replace damaged tubes.
P.T.O. SHAFT
POSSIBLE CAUSEPROBLEM CORRECTION
- Insufficient lubrication.
- Excessive working angle.
- Poor quality lubricant.
- Too much sliding under load.
- Tube overlap too-short: minimum
recommended is 6".
- Insufficient lubrication.
- Contaminants (sand, etc.).
- Pin or orifice contaminated by
sand, ice, etc.
- Telescoping members too long,
exerting pressure on locking
device.
- Lack of lubrication.
- Wrong installation of guard
chain.
- Part of the guard in contact with
the equipment.
- Tubes in contact with the
equipment.
- Premature wear of U-joints and/
or bluish color of cross journals.
- Gripping or premature wear of
telescoping members.
- Damaged or jammed locking pin
or bolt.
- Premature wear of guard tube
bearing ring.
- Cut or deformed safety guard
tubes.
8

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TROUBLESHOOTING (cont'd)
- Raise P.T.O. speed to a minimum
of 540 RPM.
- Adjust impeller blades closer to
drum outlet (1/8" to 3/16").
- Reduce travel speed.
- Raise P.T.O. speed to a minimum
of 540 RPM.
- Make sure the Snowblower is
completely empty before
reducing RPM, especially on
tractors with foot controlled
RPM.
- Repare clutch.
- Reduce travel speed.
- Remove access panel.
- Replace shear bolt.
- Replace shear bolt.
- Replace shear bolt.
- Fix or replace chain.
- Replace the key.
- Remove ice.
- Check hydraulic connections.
- Tractor RPM too low.
- Gap too wide between impeller
blade tip and drum outlet wall.
- Insuffucient tractor HP.
- Tractor RPM too low.
- Tractor RPM reduced too early
with snow still in the
Snowblower.
- Slippage of PTO clutch
mechanism.
- Wet snow condition.
- Shear bolt broken on drive shaft.
- Shear bolt broken on drive shaft.
- Shear bolt broken on auger drive
shaft.
- Broken drive chain.
- Broken key on motor.
- Ice accumulation.
- Wrong hydraulic connections.
- The snow is not being thrown as
far as usual.
- Frequent plugging of discharge
chute.
- Theimpellerwillnotturn.
- The auger will not turn.
- The chute will not turn.
SNOWBLOWER
POSSIBLE CAUSEPROBLEM CORRECTION
8

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SPECIFICATIONS
9
Model P-INV-74
Horse power recommended 35 to 65 HP
Workingwidth 74"
Cuttingheight 28"
Height - chute base 30"
Drum diameter 26"
Depth of drum 9"
Impellerblades 4 blades
Number of shear bolts 1 for impeller, 1 on auger drive
Size of impeller shaft 19/16"
Height - impeller center 15"
Impeller RPM 540 RPM
Number of augers 1
Main auger diameter 16"
Drive chain No. 60
Oil bath sealed gear box Included
Balancedimpeller Included
Balanced auger Included
Scraper blade for snowblower Included Standard steel (3/8" x 2 1/2") - not reversible
Opt. Carbon steel 450 (1/2" x 3")
Opt. Stainless Steel (1/2" x 3")
Rear mount scraper blade Option
Plow blade for rear mount scraper blade Opt. Standard steel
Opt. TIVAR
Opt. Stainless steel
Semi-industrialchute With cylinder 25TR04 on the deflector included
Chute rotation mechanism Hydraulicwith motorMLH-125included
Antifrictionringincluded
P.T.O. Category T50
Auger bearing /ductile iron casing 11/4"
Hose support Included
Hitch category Category 1 28 1/2" c/c
Weight(approx.) 900lbs
Design and specifications subject to change without notice.

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SNOWBLOWER P-INV-74
10
170-05463

- 20 -
SNOWBLOWER P-INV-74 (cont'd)
1 120-07642 Frame P-INV-74 ...................................................................................................... 1
2 140-25432 Scraper blade 3/8" x 2 1/2" x 72 3/4" lg standard steel .............................................. 1
2 140-25432 Scraper blade 3/8" x 2 1/2" x 72 3/4" lg standard steel (rear mount scraper blade) ......... opt.
3 319-38280 Plow bolt 7/16" NC x 1 1/4" lg + lockwasher ........................................................... 8
3 319-38280 Plow bolt 7/16" NC x 1 1/4" lg + nut & lockwasher (rear mount scraper blade) (8) ......... opt.
4 300-40280 Bolt 1/2" NC x 1 1/4" lg ......................................................................................... 1
5 130-81581 Shaftendretainer .................................................................................................... 1
6 UCPE208-24 Bearing 1 1/2" ....................................................................................................... 1
7 110-44301 Adjustment plate for impeller shaft + 2 nuts 1/2" NC .................................................. 1
8 300-44355 Bolt 5/8" NC x 2 1/4" lg ......................................................................................... 2
9 110-44242 Impeller 26" ø x 9" - 4 blades ................................................................................. 1
10 110-44282 Impellershaft .......................................................................................................... 1
11 300-36250 Bolt 3/8' NC x 1" lg + nylon locknut ........................................................................ 4
12 6253 Pin category 1 ........................................................................................................ 2
13 300-40520 Bolt 1/2" NC x 5" lg + nylon locknut ....................................................................... 2
14 300-40490 Bolt 1/2" NC x 4 1/2" lg + nylon locknut ................................................................. 2
15 Std. Hitch pin clip 5/32" ................................................................................................ 3
16 150-06012 Pin (top link)........................................................................................................... 1
17 300-40460 Bolt 1/2" NC x 4" lg + nylon locknut ....................................................................... 2
18 110-44233 Right lower hitch..................................................................................................... 1
19 110-44234 Leftlowerhitch ....................................................................................................... 1
20 140-25941 3-points side bar ..................................................................................................... 2
21 300-40340 Bolt 1/2" NC x 2" lg + nylon locknut ....................................................................... 3
22 110-33781 Hoses support ........................................................................................................ 1
23 110-44372 Upper hitch ............................................................................................................ 1
24 130-83744 Right guard ............................................................................................................ 1
25 130-83743 Leftguard .............................................................................................................. 1
26 300-32220 Bolt 1/4" x 3/4" lg + nylon locknut.......................................................................... 1
27 Std. Grease fitting 1/4" - 28 straight ................................................................................ 3
28 Std. Hitch pin clip 1/8" x 2 9/16" ................................................................................... 4
29 300-46370 Bolt 3/4" NC x 2 1/2" lg + nylon locknut ................................................................. 1
30 Std. Grease fitting 1/4" - 28 elbow 90 deg. ..................................................................... 2
31 8186 Idler sprocket # 60 .................................................................................................. 2
32 336-44000 Nut 5/8 NC ............................................................................................................ 1
33 110-44401 Idler ...................................................................................................................... 1
34 300-40415 Bolt 1/2" NC x 3 1/4" lg + nylon locknut ................................................................. 1
35 300-36250 Bolt 3/8" x 1" lg + nylon locknut............................................................................. 6
36 110-45522 Interior chain guard (center) ...................................................................................... 1
37 110-45512 Interior chain guard (front) ........................................................................................ 1
38 300-40280 Bolt 1/2" x 1 1/4" lg + flat washer + nylon locknut................................................... 3
39 300-40310 Bolt 1/2" x 1 1/2" lg + nylon locknut....................................................................... 4
40 130-81811 Mounting plate for drive ass'y................................................................................... 1
41 UCFD207-20 Bearing 1 1/4" + flange & 2 grease fitting straight ...................................................... 3
42 190-12331 Chain #60 45 3/4" lg 61 links ................................................................................ 1
42 26A60 Connecting link #60 ................................................................................................ 1
42 59-60 Offset link #60 ....................................................................................................... 1
43 160-26791 Spacer for drive shaft............................................................................................... 1
44 160-26501 Brass bushing 1 1/4" i.d. x 1 1/2" o.d. x 5/8" lg ....................................................... 1
45 300-32310 Bolt 1/4" NC x 1 1/2" lg grade 5 + nylon locknut ...................................................... 1
46 110-44351 Sprocket #60 + shearplate (including no. 44 & 47) .................................................... 1
47 160-26511 Brass bushing 1 1/4" i.d. x 1 1/2" o.d. x 5/8" lg ....................................................... 1
48 110-44342 Auger drive shaft 27 3/32" lg hors tout (including no. 89) ........................................... 1
49 110-44292 Auger .................................................................................................................... 1
50 8030 Key for gearbox ...................................................................................................... 1
51 8251 Gear box T27D ...................................................................................................... 1
52 140-10571 Backplate .............................................................................................................. 1
REF. PART # DESCRIPTION QTY
10