pronovost P-860IV Product manual

OPERATOR'S / PARTS
MANUAL
No. C928 05/2009
Inverted snowblower
Models
P-860IV & P-920IV

Copyright © Les Machineries Pronovost Inc., 2009
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
General assembly ....................................................................................................... 12
5 Start-up...................................................................................................................................13
Basic Start-up Procedures.......................................................................................... 13
6 Maintenance .............................................................................................................. 14
7 Storage ...................................................................................................................................15
8 Trouble Shooting ..................................................................................................................16
9 Specifications ............................................................................................................. 18
10 PartsList....................................................................................................................19
InvertedSnowblowersP-860IV,P-920IV ....................................................... 19
Semi-industrialChutePSIG-7486IV ................................................................. 23
P.T.O. Shaft # 190-00471 ............................................................................... 24
Gear Box # 190-01491 .................................................................................... 25
Cylinder25TR08.............................................................................................. 26
HydraulicMotorMLH-315 .............................................................................. 27
11 Torquechart............................................................................................................... 28
12 Warranty .................................................................................................................... 29

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INTRODUCTION
Your Snowblower was carefully designed and we are
confident it 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.
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 side of the Snowblower is the
drive chain side.
If you require additional information on your
Snowblower, please contact your PRONOVOST
Dealer.
When ordering parts from your Dealer, please refer to
these numbers for a fast and efficient service. Use
PRONOVOST parts for replacement.
When ordering parts from your Dealer, please refer to
these numbers for a fast and efficient service. Use
PRONOVOST parts for replacement. MODEL: "
SERIAL NO.: "
DATE OF PURCHASE: "
Figure 1
LES MACHINERIES PRONOVOST INC. ST-TITE
MODÈLE SÉRIE
FAIT AU CANADA MADE IN CANADA
NOW take a moment to enter the model, serial
number and the date of purchase of your Snowblower
in the space provided.
The model and serial numbers are on the name plate
shown on Fig. 1.
Right
Left

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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.
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.
9) Before unplugging the chute, always disengage the
P.T.O., stop the engine and relieve all hydraulic pressu-
res.

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SAFETY (cont'd)
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) The recommended road speed should be such as to
maintain full control over steering and braking.
5) 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.

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DECALS
SAFETY DECALS
The safety decals ara 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. Each decal is shown and
identified with a part number.
Figure2
Decal A Part no.: 190-11671 Figure4
Decal C Part no.: 190-11641
Figure3
Decal B Part no.: 190-07722

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DECALS (cont'd)
Figure7
Figure6
Decal D Part no.: 190-06651
D
Figure8
Decal E Part no.: 190-07611
Figure5
BB
C
A

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Figure11
Part no.: A108
DECALS (cont'd)
Figure10
Part no.: A 109
Figure9
E

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DECALS (cont'd)
Figure15 Part no.: A 106
MAINTENANCE DECALS
The maintenance decals indicate the points requiring
lubrication. Refer to maintenance section for more
details.
Figure14 Part no.: 190-11581
Figure13
Figure12
Decal G Part no.: 190-10991
G

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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. 16).
3) Install P.T.O. shaft onto the snowblower rotor.
You must put the shear pin end to the tractor PTO
output shaft and the other end on the snowblower
rotor shaft. Then attach safety shield support
chain as shown. WARNING: The telescoping
tubes of the drive shaft must never be allowed to
bottomoutwhilemaintainingaminimumoverlap
of 6 inches.
4) If you install a hydraulic cylinder on the chute
deflector, use model 25TR08 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) Install the chute rotation mechanism.
Figure16

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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
SAE80W90oil.
2) Lubricateallpoints witha good quality
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. 17).
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
with the take-up screws provided.
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
Figure17

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4
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 high quality low temperature grease.
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) Standard scraper blades are reversible. Reverse
when one edge is worn out.
12) Always use recommended shear bolts.
13) UHMW slides do not require lubrification except at
the end of the season in order to prevent corrosion
of steel components that are in contact with the
UHMW material.

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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.

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TROUBLESHOOTING
- Followlubrication
recommendations.
- Replace defective U-joints.
- Make sure the snowblower inlet
face is perpendicular to the
ground and if possible readjust 3-
pointhitch inorder to positionthe
snowblower further away from
tractor.
- Avoidraisingsnowblowerwhile
inoperation.
- Readjust 3-point hitch in order to
position the snowblower closer to
the tractor.
- Followlubrication
recommendations.
- Replace defective telescopic
members.
- Clean and grease.
- Readjust 3-point hitch in order to
position the snowblower further
away from tractor.
- Followlubricationinstructions.
- Adjust chain to prevent
interference between guard &
equipment.
- Replace worn or damaged
bearingrings.
- Eliminate any interference
between tubes and equipment or
tractor.
- Replace damaged tubes.
P.T.O.SHAFT
POSSIBLECAUSEPROBLEM CORRECTION
- Insufficientlubrication.
- Excessive working angle.
- Toomuchslidingunderload.
- Tubeoverlaptoo-short:minimum
recommended is 6".
- Insufficientlubrication.
- Contaminants (sand, etc.).
- Pin or orifice contaminated by
sand, ice, etc.
- Telescopingmemberstoolong,
exerting pressure on locking
device.
- Lackof lubrication.
- Wronginstallationof guard chain.
- Part of the guard in contact with
theequipment.
- 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.
- Damagedor jammedlocking pin
orbolt.
- Premature wear of guard tube
bearingring.
- Cut or deformed safety guard
tubes.

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TROUBLESHOOTING (cont'd)
SNOWBLOWER
- Raise P.T.O. speed to a minimum
of 540 RPM.
- Adjust impeller blades closer to
drumoutlet(1/8" to3/16").
- 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 the access door.
- Replace shear bolt.
- Replace shear bolt.
- Replace shear bolt.
- Fix or replace chain.
- Remove ice.
- Checkhydraulic connections.
- Reset cushion valve up to 1800
psi (max)
- Increase tension of spring by
addingshim(s)
- Remove ice.
- Checkhydraulic 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.
- Ice accumulation.
- Wronghydraulicconnections.
- Cushionvalve settingtoo low
- Tension of the spring in drum
lockingmechanisminsufficient
- Ice accumulation.
- Wronghydraulicconnections.
- The snow is not being thrown as
far as usual.
- Frequentpluggingofdischarge
chute.
- Theimpellerwillnotturn.
- The auger will not turn.
- The rotating drum will not turn.
- Therotatingdrumwillnothold
it'spositionwhen blowingviathe
spout
- The chute will not turn.
POSSIBLECAUSEPROBLEM CORRECTION

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SPECIFICATIONS
P-860IV P-920IV
Horse power recommended 50 to 75 HP
Working width 86" 92"
Cutting height 31"
Impeller diameter 28"
Depth of drum 12"
Impeller blades 4 curved blades
Number of shear bolts 1 for impeller, 1 on auger drive
Size of impeller shaft 1.575" (40 mm)
Impeller RPM 540 RPM
Number of augers 1
Drive chain No. 80
Scraper blade for snowblower Std. yStandard steel (1/2" x 4")
Opt. yCHT-360 steel (1/2" x 4")
Opt. yCHT-360 steel (1/2" x 6") sharpened
Opt. yTIVAR 88TM (1" x 5¼")
Opt. yStainless Steel (1/2" x 4")
Rear mount scraper blade Option
Plow blade for rear mount scraper blade Opt. yStandard steel
Opt. yTIVAR
Opt. yStainless steel
Chute Semi-industrial chute with cylinder on the deflector
Chute rotation mechanism Hydraulic with motor included
UHMW slide included
P.T.O. No. 6
Auger bearing 1 1/2"
Hose support Included
Hitch category Category 2
Weight (approx.) 1200 lbs 1600 lbs
Design and specifications subject to change without notice.

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SNOWBLOWERS P-860IV P-920IV 170-04471R1

- 20 -
REF. PART # DESCRIPTION QTY
P-860IV P-920IV
1 120-06701 Frame for P-860IV ...................................................................................... 1 -
1 120-06311 Frame for P-920IV ...................................................................................... - 1
2 140-00812 Standard steel reversible scraper blade 1/2" x 4" x 84 1/2" lg .......................... 1 -
2 140-00832 Standard steel reversible scraper blade 1/2" x 4" x 90 1/2" lg .......................... - 1
2 140-15041 Stainless steel reversible scraper blade 1/2" x 4" x 84 1/2" lg .......................... opt. -
2 140-15051 Stainless steel reversible scraper blade 1/2" x 4" x 90 1/2" lg .......................... - opt.
3 319-38310 Plow bolt 7/16" NC x 1 1/2" lg + nut & lockwasher ....................................... 9 9
4 120-03953 Semi-industrial chute ................................................................................... 1 1
5 D-600-51 Pin 1" x 3" ................................................................................................ 2 2
6 51472 Hitch pin clip (CP132H) ............................................................................... 4 4
7 25TR08 Cylinder 2.5" x 8" standard ......................................................................... 1 1
8 8149 U-shaped UHMW ± 14" i.d. ........................................................................ 1 1
9 300-38310 Bolt 7/16" NC x 1 1/2" lg + two-way locknut ............................................... 4 4
10 110-21091 Chain guard cover ....................................................................................... 1 -
10 110-21081 Chain guard cover ....................................................................................... - 1
11 8374 Adjustable clamp fastener (welded) ............................................................... 1 1
12 110-10271 Threaded tube for idler adjustment ................................................................ 1 1
13 110-02402 Threaded rod for idler adjustment + nut 7/16" NC .......................................... 1 1
14 Std. Grease fitting 1/4"-28 90° .......................................................................... 2 2
15 9688 Compression spring ..................................................................................... 1 1
16 300-38250 Bolt 7/16" NC x 1" lg + nylon locknut .......................................................... 2 2
17 346-45000 Nylon locknut 5/8" NC thin .......................................................................... 1 1
18 376-44000 Flat washer 5/8" ......................................................................................... 1 1
19 300-38310 Bolt 7/16" NC x 1 1/2" lg + nylon locknut .................................................... 4 4
20 110-16481 Chain guard ................................................................................................ 1 1
21 Std. Grease fitting 1/4"-28 straight ...................................................................... 8 8
22 FD207 Flange (for 2 grease fitting) .......................................................................... 1 1
23 SAG207-20 Bearing 1 1/4" (with eccentric collar for FD207) ............................................. 1 1
24SAGFD207-20-C Bearing 1 1/4" + flange & 2 grease fitting (straight) + eccentric collar ............. 1 1
25 160-03942 Spacer 1 1/4" i.d. x 1 5/8" o.d. x 5/32" thick ................................................ 1 1
26 8009 Brass bushing 1 1/4" i.d. x 1 1/2" o.d. x 1 3/16" lg ........................................ 2 2
27 190-01401 Chain no. 80 x 71" lg (71 links) .................................................................... 1 1
28 300-46400 Bolt 3/4" NC x 3" lg + nylon locknut ............................................................ 2 2
29 110-01052 Idler .......................................................................................................... 1 1
30 160-06511 Spacer 3/4 i.d. x 1 1/4" o.d. x 3/4" lg .......................................................... 2 2
31 8184 Sprocket 80A10 + shearplate ...................................................................... 1 1
32 9287 Idler sprocket #80 ....................................................................................... 2 2
33 150-00332 Idler clevis pin ............................................................................................ 1 1
34 150-01491 Bushing 1/4" d.i. x 7/8" d.e. x 3/4" lg (welded) .............................................. 2 2
35 300-32340 Bolt 1/4" NC x 2" lg + nylon locknut ............................................................ 1 1
36 110-18821 Auger drive shaft 32 13/16" lg overall (includes no. 34 and no.37) ................... 1 -
36 110-05971 Auger drive shaft 35 13/16" lg overall (includes no. 34 and no.37) ................... - 1
37 6466 Splined adaptor 1 1/4" - 19 splines (welded) .................................................. 1 1
38 300-40280 Bolt 1/2" NC x 1 1/4" lg + lock washer ........................................................ 8 8
39 190-01491 Gear box T27D modified .............................................................................. 1 1
40 8199 Adjustment plate for gear box + 4 nuts 1/2" NC ............................................ 1 1
41 MLH-315 Hydraulic Orbit motor with cushion valve ....................................................... 1 1
42 8369 Key for hydraulic motor ................................................................................ 1 1
43 130-08162 Guard ........................................................................................................ 1 1
44 300-38280 Bolt 7/16" NC x 1 1/4" lg + nylon locknut + flat washer ............................... 2 2
45 323-36160 Hexagonal socket set screw 3/8" NC x 3/8" lg ............................................... 2 2
46 110-44331 Sprocket 9 tooth ......................................................................................... 1 1
47 300-38400 Bolt 7/16" NC x 3" lg + nylon locknut ......................................................... 2 2
48 300-40310 Bolt 1/2" NC x 1 1/2" lg + nylon locknut + flat washer ................................. 2 2
49 110-01341 Retaining bracket ......................................................................................... 1 1
50 302-46580 Bolt 3/4" NF x 6" lg + nylon locknut ............................................................ 2 2
51 300-36250 Bolt 3/8" NC x 1" lg + lock washer .............................................................. 4 4
SNOWBLOWERS P-860IV & P-920IV