HOGG & DAVIS HYDRA 985 User Manual

HYDRA 985

The information, specifications, and illustrations in this manual are on the basis of

information available at the time it was written. The specifications, torque values,

pressures of operation, measurements, adjustments, illustrations, and other

items can change at any time. These changes can affect the service of the given

product.

For the complete and most current information, contact:

Hogg & Davis, Inc

P.O. Box 405 / 3800 Eagle Loop

Odell, OR 97044-0405

541-354-1001

541-354-1080 Fax

For most recent manual

version please visit:

www.hoggdavis.com

HYDRA 985

Contents

PRODUCT WARNINGS ........................................ 4

OPERATIONS ...................................................... 5

DIESEL ENGINE SPECIFICATIONS ............................................................................................................... 6

INTRODUCTION ......................................................................................................................................... 6

GENERAL SPECIFICATIONS. ....................................................................................................................... 6

TRAILER ORIENTATION .............................................................................................................................. 8

MAIN FRAME AND AXLE ........................................................................................................................... 8

CONTROLS ................................................................................................................................................. 9

LOADING INSTRUCTIONS ........................................................................................................................ 10

HYDRAULIC CONTROLS ........................................................................................................................... 11

Power Unit Features ........................................................................................................................... 11

FRONT HYDRAULIC CONTROLS ........................................................................................................... 12

FRONT CONTROL BANK ....................................................................................................................... 13

REEL CARRYING RACKS (MANDREL RACKS) ........................................................................................ 14

POWERED IDLER WHEELS AND HYDRAULIC CONTROLS ..................................................................... 14

AUXILIARY POWER SHAFT ................................................................................................................... 14

POWER UNIT ....................................................................................................................................... 14

JACKSTANDS ........................................................................................................................................ 15

STEER-GO OPERATION ........................................................................................................................ 16

MANUERVERING INSTRUCTIONS ............................................................................................................ 16

TO STEER AND MOVE .......................................................................................................................... 17

THE JOYSTICK ...................................................................................................................................... 17

ON BOARD AIR COMPRESSOR ............................................................................................................. 18

BRAKE CONTROLLERS .......................................................................................................................... 18

TOOL CIRCUIT (OPTIONAL) ...................................................................................................................... 19

LEVELWIND OPERATIONS ....................................................................................................................... 20

LEVELWIND COMPONENTS ................................................................................................................. 21

PULLING PROCEDURES ............................................................................................................................ 22

OVERHEAD WIRE ................................................................................................................................. 22

HYDRA 985

UNDERGROUND PULLING ................................................................................................................... 23

SERVICE ............................................................ 24

HYDRA 985 Lubrication ....................................................................................................................... 25

JACKSTAND INSTALLATION ................................................................................................................. 26

DRIVE ROLLER MAINTENANCE ............................................................................................................ 27

DRAWDAR INSPECTION ...................................................................................................................... 28

ACME ADJUSTING SCREW ................................................................................................................... 28

MANDREL RACK STABILIZER INSTALLATION ....................................................................................... 29

HYDRA 985

PRODUCT WARNINGS

These warning labels and others like it are placed in critical areas of the machine. The warnings

are to be read and fully understood prior to operation of the unit.

HYDRA 985

OPERATIONS

INTRODUCTION

The Hogg & Davis, Inc HYDRA 985 Cable Reel Unit is an advanced design cable pulling trailer that provides tremendous pulling forces in a compact vehicle. Its total design provides for easy operations and affords great savings in set-up and manpower. Full utilization of the HYDRA 985 will greatly improve your cable installation and removal operations.

This manual is designed to make you familiar with the machine and its operation.

READ THIS MANUAL THOUROUGHLY BEFORE OPERATING THE MACHINE

GENERAL SPECIFICATIONS.

 REEL CAPACITY: 108” dia X 56” wide  HYDRAULIC REEL LIFITING CYLINDERS

 HYDRAULIC POWERED IDLER WHEEL

 HYDRASTATIC TRANMISSION POWER

UNIT

 CADMIUM PLATED, QUICK RELEASE

JACKSTANDS

 20,000 STUB STPINDLE AXLE

 AIR BRAKES w/ABS  2.5” REEL MANDREL WITH TAPERED

CENTERING CONES, LOCKING COLLARS, AND NYLATRON BEARINGS

DIESEL ENGINE SPECIFICATIONS

3TNV88-BDSA General Specification

36.0 HP (26.9 kW) @ 3000 rated rpm*

_____________________________________ _______________________________________ __________________

Type• • • 3 Cylinder, 4-Cycle, Liquid Cooled

Diesel Engine

Bore • • • • • • • • • • • • • • • • • • • • • • 88 mm Stroke • • • • • • • • • • • • • • • • • • • • • 90 mm Displacement • • • • • • • • • • • • • • • • • 1.642 L Aspiration • • • • • • • • • • • • • Naturally

Aspirated

Combustion System • • • • • • • • • • Direct

Injection

Rotation (from flywheel end) • • • • • •

Counterclockwise

Dry Weight • • • • • • • • • • • • • 341 lbs (154 kg)

HYDRA 985

The HYDRA 985 is made up of four (4) major working components (see Fig.1) they are:

A. MAIN FRAME AND AXLE B. POWER UNIT C. POWER IDLER WHEEL AND CONTROLS D. REEL CARRYING RACKS

MAIN FRAME AND AXLE

The main frame and axle carry the entire weight of the trailer and its payload. Constructed of heavy steel, the main frame will provide many years of durable service and minimum maintenance. The fenders and tool compartments are incorporated as part of the main frame structure.

The axle is of the 20,000 lb capacity stub type. Heavy duty brakes, hubs and bearings provide many years of service over all highway types.

LUBRICATION SCHEDULE SHOULD

BE FOLLOWED

TRAILER ORIENTATION

HYDRA 985

CONTROLS

The control panel has a variety of gauges and switches that control certain functions during the operation of the HYDRA 985. Here is a description of these controls. (Figure 2)

A. Hydrastatic Pressure Gauge: This gauge alerts the operator to the system pressure at all times

during operation. IT IS NOT A GAUGE TO ILLUSTRATE line pull.

B. Front / Rear Control: This switch isolates the front and rear controls of the unit during operation. C. Ignition Switch D. Switch Panel: This panel contains various switches to control functions of the unit. Depending on

options installed the location of the switches may vary. They Include: Two speed on the fly shift to Hi or Low speed, marker beacons, level wind, auxiliary air compressor, work lights, auxiliary hydraulic tool circuit, etc.

E. Joystick: Spring return to Neutral control joystick for operating the Pay out or Take up feature of

the puller. Proportional control allows for infinite speeds and pulling force during operation. An "OPERATOR PRESENT" switch may be installed on certain units. This provides security against payout under power. Unit will not pay out until the switch has been pressed and the joystick moved out of the neutral position

LOADING INSTRUCTIONS

HYDRA 985

Power Unit Features

 A- ACME ADJUSTING SCRW  B - EXTENDED SHAFT GUARD COVER

 C- POWER UNTI DRIVE SHAFT 2 7/16"

A B C

HYDRAULIC CONTROLS

HYDRA 985

FRONT HYDRAULIC CONTROLS

 A - STEER GO SYSTEM  B - FRONT HYDRAULIC CONTROLS (DRAWBAR, POWER UNIT, LEFT AND RIGHT

MANDREL RACKS

HYDRA 985

FRONT CONTROL BANK

 A - DRAWBAR RAISE AND LOWER  B - POWER UNIT FORWARD AND BACK  C,D - RIGHT AND LEFT AND RIGHT MANDREL RACK RAISE AND LOWER

HYDRA 985

POWER UNIT

The Power Unit consists of the engine, Hydrostatic Transmission Drive Unit, Drive Rollers, Engine Controls, hydraulic reservoir and auxiliary power shaft. The power unit supplies power for all hydraulic functions and turns the reels to provide cable pulling. Pulling controls are located at the power unit, the rear curb side of the trailer. Electronic controls at the rear of the trailer control the direction of pull for cable take-up or pay-out and control the throttle, level wind, hydraulic tool circuit, and hi and low shift. All primary engine controls are located at the front of the power unit.

AUXILIARY POWER SHAFT

This shaft is located on the side of the power unit and is used for light duty winding operations. Attachments can be added to the shaft. The rotation of the shaft is controlled with the Joystick that controls the take up and pay out functions. When not in use, the shaft should be covered with the cover provided.

POWERED IDLER WHEELS AND HYDRAULIC CONTROLS

The powered idler wheel is located towards the front of the trailer. This wheel is hydraulically raised or lowered and hydraulically powered to provide maneuverability of the trailer when disconnected from the towing vehicle. The wheel is steered by means of a power steering control unit (figure 3). The joystick controls forward and reverses movement as well as left and right direction of the trailer. Refer to the Steer-Go Power Steering section. The hydraulic controls are located between the power unit and the idler wheel at the main drawbar cross member.

The four valves control the following functions:

 Drawbar Height: raise and lower  Power Unit direction: fore and aft  Right Mandrel Rack: raise and lower  Left Mandrel Rack: raise and lower

REEL CARRYING RACKS (MANDREL RACKS)

The reel carrying racks (mandrel racks) are located in the reel carrying area at the rear of the trailer (fig 5A and 5B). These racks have several pockets to allow a variety of reel diameters to be picked from the ground. Follow the LOADING INSTRUCTIONS when loading the reel. The mandrel rack locks are indicated in Fig 5C. Also, Fig 5D shows the rear controls for the power unit and the Jack stands (FIg 5E and 5F)

JACKSTANDS

JACKSTANDS ARE STABILIZING LEGS LOCATED AT THE REAR OF THE TRAILER. THE JACKSTANDS

SHOULD BE USED DURING ALL PULLING OPERATIONS

In Fig 5, the jack stand at the left is shown in the stowed or carried position. The jack stand at the right is shown in the down or pulling position. Each jack stand is positioned by the use of a ratchet locking in the notches. To release the jack stands from the carrying position, lift and rotate out of the carrier. To raise, rotate stand one quarter turn to release the ratchet from the notch and raise the stand to lock into the carrier.

HYDRA 985

NOTE: Visual inspection of the drive chain and sprockets is required prior to every use, check chain for wear, slack and damage.

MANUERVERING INSTRUCTIONS

One of the main features of the HYDRA 985 is its ability to maneuver under its own power by use of the Powered Idler Wheel and the Steer Go System.

The main intent of the Idler wheel system is to provide for easy maneuverability of the unit around the jobsite, to load and unload the reels, and to aid in the attachment and removal from the tow vehicle. It is NOT designed to move the trailer long distances (example – vault to vault) without the aid of the tow vehicle. It is NOT designed to be used for movement or transportation up or down an incline greater than 2%. Using the Steer Go system in this manner can create extreme stress on the system and could possibly create a failure that could lead to a trailer that can NOT be steered, controlled or stopped.

Any operator MUST be familiar with the control of the trailer when it is being moved with the Idler Wheel System. Familiarize the use of the joystick, engine speed, and the brake controls prior to operating the trailer.

USE OF THE STICK WHICH CONTROLS THE IDELR WHEEL MOTOR AS A BRAKE SHOULD BE AVOIDED

STEER-GO OPERATION

There are two (2) main components in the system.

A. The Steer-Go Control Box mounted to

the right hand (curb) side of the trailer drawbar.

B. The Rotary Actuator Assembly attached

to the Idler Wheel Fork Assembly

Working together, these components allow the operator to easily steer and maneuver the trailer by merely moving the joystick control as desired. The actuator can move the wheel through a 180 degree arc, 90 degrees either side of center.

In the instructions that follow we will often refer to "steering" and "motion” For our purposes, "Steering" will always refer to the action of turning right or left. The word "motion" will always refer to forward or reverse direction of the idler wheel

HYDRA 985

THE JOYSTICK

The joystick is a two-axis control that controls both steering and motion of the idler wheel functions. The joystick is either mechanically linked or electronically controlled (depending on options) to hydraulic control valves. Mechanical valves are spring return to neutral. Electronic joysticks are also spring return to neutral. Releasing the joystick will cause all movement to stop.

The linkage system, in the mechanical system, provides quick positive response to the operators action. Because the response is quick, steering right or left is usually accomplished by a series of short, momentary movements of the joystick in the desired left or right direction.

NOTE: Refer to the directional decal (Fig. 7) on the top of the control box prior to operating. Become familiar with the feel of the joystick with the engine running. Note the short movement required to move through the full range of direction

TO STEER AND MOVE

CAUTION: Note the direction the idler wheel is pointing before actuating the joystick. The trailer will move in the direction the wheel is pointing

Start the Engine. With the engine running at IDLE SPEED, move the joystick to the right or left. (NOTE: Steering

speed is NOT affected by engine RPM)

Move the joystick to the FWD position. The trailer now travels forward. By holding the joystick in the forward position and moving it to the RIGHT, the trailer will turn RIGHT. Release the turning motion when the wheel has reached the angle of turn you desire. Trailer will continue to turn until you steer LEFT to straighten out the wheel.

To back the trailer, move the joystick to the REV position. When you turn to face the rear of the trailer as you are backing, the steering directions are reversed.

NOTE: Idler wheel speed is a function of engine RPM. Idle is enough to provide easy, smooth operation. The higher the RPM the faster the unit will move

Figure 7

HYDRA 985

BRAKE CONTROLLERS

Brake controllers on the HYDRA 985 are what is commonly used in an air brake trailer. Figure 6 shows us the location of the following:

C: The hand control located on the apex of the trailer D: The Push-Pull Switch located at the apex of the trailer

ON BOARD AIR COMPRESSOR

Each air brake unit that is equipped with an engine has an air compressor installed to charge the system while away from a tow vehicle. This compressor is located in the power unit and can be controlled by a switch on the main control panel. It is recommended that the unit engine be started with the switch in the OFF position to allow for maximum battery power for starting. After the engine is running, turn the compressor on to charge the system. Although the compressor has an automatic shut off when it reaches the pre determined pressure in the system, for extended life and better starting power, it is recommended that the compressor be switched OFF after the system pressure has been reached.

HYDRA 985

TOOL CIRCUIT (OPTIONAL)

Some trailers may be equipped with an optional hydraulic tool circuit. The circuit is designed for tools which are used intermittently or for short duration such as a pump or hydraulic cutters. It is NOT designed for uses of long or continuous duration such as hydraulic blowers or generators.

The tool circuit outlets are located in the rear curbside (Fig. 8) fender panels. Two quick disconnect fittings are provided. The tool circuit is actuated by an electric switch located on the main control panel, and the rear fender panel. This system is designed to provide 10 GPM at 2000 psi.

WARNING: WHEN NOT IN USE, THE SWITCH MUST BE IN THE OFF POSITION. IF THE SWITCH IS LEFT

ON, WHEN TOOLS ARE DISCONNECTED, SEVERE BACKPRESSURE WILL OCCUR THAT COULD DAMAGE

THE HYDRAULIC SYSTEM.

HYDRA 985

LEVELWIND OPERATIONS

Some units are equipped with a Level wind System. This system is hydraulically actuated boom style level wind located at the rear of the trailer (Fig. 9)

There are two switch locations to operate the level wind. They are at the main control panel and the rear control panel located at the curbside fender. Each switch is directional in relation with the travel of the level wind boom. That is, if you push the switch to the right, the boom travels right as you view the level wind. If you push the switch left, the boom travels left. The switches are momentary and as you release them, it comes to a neutral position and the boom stops.

The level wind does not operate automatically. The operator must activate the switch each time the rope or wire is to be moved on the reel. The top roller of the boom carriage is made with a swing away mounting to allow for insertion or removal of the line. By removing the pin located in the boom, the upper boom section can be extended or retracted as needed. DO NOT OPERATE THE

LEVELWIND WITHOUT THE PIN INSTALLED IN THE BOOM SECTIONS. THIS MAY CAUSE THE BOOM

TO COME OUT OF THE LOWER SECTION DURING OPERATION.

The level wind is most suitable for overhead pulls. Its use for underground is greatly restricted due to manhole size and amount of pull required. Do not use the level wind as a "breaker bar" for underground pulls.

To load with the level wind installed, pull the left hinge pin and swing the assembly out of the hinge and to the right. After the reel is loaded, swing assembly back into hinge and insert the lock pin.

The lower turnbuckle support is provided to allow for easy movement of the level wind arm during loading and unloading of reels. It may be necessary to adjust this turnbuckle if the unit becomes difficult to swing in and out of the hinge.

The unit can be easily removed from the trailer by disconnecting the hoses and pulling the hinge pins.

BE SURE TO USE A FORKLIFT OR OVERHEAD CRANE WHEN REMOVING AND INSTALLING THE

LEVELWIND ASSEMBLY.

HYDRA 985

LEVELWIND COMPONENTS

The following are the main components in the LW Assembly

A. Hinge Pin B. Lower Boom Assembly C. Level wind cylinder D. Turnbuckle E. Hydraulic QD fittings F. Carriage Assembly G. Upper Boom Assembly H. Lock pin for Boom Assemblies

A H G

F E D C B

OVERHEAD WIRE

The following is a basic description of how to set up and pull overhead wire.

1. Set up the dolly with the longest lead possible with the axis of the trailer in line with the

pull.

2. Lower the drawbar - set the jack stands - raise the drawbar to put pressure on the legs

3. Chock the wheels

4. Move the drive rollers against the flange of the reel until visible indentations are visible on

the drive roller friction material. Apply more pressure to reel flange if drive wheels slip.

5. Select the desired Hi-Lo speed setting

6. Increase engine RPM to 2000

7. Move control lever to take-up position and start pulling.

8. To stop the pull, return the control lever to neutral.

DANGER

NEVER allow the Power Unit to become disengaged from the reel

during an overhead pull. This will cause the reel to spin freely and

may drop the rope or conductor. Doing so may cause the pulling

line and or wire to drop onto other energized conductors causing

serious injury or death

Although all jobs will vary, below is a basic description of how to operate the HYDRA 985. Please

consult your Employers rules and regulations and always consult and follow guidelines set for by the

IEEE.

PULLING PROCEDURES

HYDRA 985

UNDERGROUND PULLING

1. Position the trailer over the manhole (vault opening, etc). The best position for maximum

pulling power is to position the reel DIRECTLY over the pull.

2. Lower trailer drawbar

3. Set Jack stands

4. Raise trailer drawbar to set pressure on the jack stands. It is not advised to remove the tires

from the ground when setting the jack stands. They are there to help stabilize the trailer and spread the load over the entire frame, stub axles and front idler wheel.

5. Chock the tires

6. Set the brakes - Air ABS systems ONLY

7. Move the drive rollers against the flange of the reel until visible indentations are visible on

the drive roller friction material. Apply more pressure to reel flange if drive wheels slip.

8. Select the desired Hi-Lo speed setting

9. Set the engine RPM to IDLE. Increase engine RPM as needed.

NOTE: Most wreck out jobs can be broken loose with the RPM at idle. If slipping occurs during the pull, gently increase the pressure of the Power Unit against the reel flange.

Level wind on the reel.

After the pull has begun, it may be necessary to keep the pulling rope or wire level on the reel. To do so, stop the pull, lower the drawbar to release pressure on the jack stands, turn the Idler wheel perpendicular to the axis of the trailer and slight change the rear angle of the unit. This slight change with all for the rope to wind itself back towards the other flange. Set the pressure back to the jack stands and continue take-up operation.

SERVICE

HYDRA 985

HYDRA 985 Lubrication

The following lubrication instructions are offered as "rule of thumb". Precise lubrication instructions will vary with each usage of each unit. CHECK ALL LUBRICATIONS BEFORE EACH USE

ENGINE: Consult Engine Manual for precise instructions. Unit is delivered by Hogg & Davis, Inc. with 10W40 oil.

HYDRASTATIC DRIVE SYSTEM: This Drive System is practically maintenance- free, however the oil should be changed every six months with ISO 46 wt. or its equivalent. There are three oil filters that should be changed also at this time. (Refer to schematic) One of these filters is a high pressure filter and has a restriction gauge on it, this gauge should be checked daily, if it reaches the red line, this filter should be changed immediately.

WHEEL BEARINGS: Wheel bearings are of the oil bath style and should be inspected as part of the Drivers Pre-Trip Inspection.

IDLER WHEEL: Lubricate every 30 days. Zerk fittings are provided for proper application of lube. Lube all parts, including spindle housing, "A" frame supports, and hydraulic cylinder linkage.

LIFTING RACKS: Lubricate every 30 days.. Lube all parts, including rack and attached stabilizer bars. NOTE: If racks do not lower properly, it may be necessary to lift rack entirely off cylinder, and with solvent clean away caked grease and dirt build-up. Wipe thin coat of lube all around cylinder before replacing rack. The holes on the racks are NOT designed for Zerk fittings. They allow air to escape during the lowering process. It may be helpful to spray some light oil into the holes to aid with raising and lowering.

DRIVER ROLLERS: Sealed bearings.

SPROCKET ASSEMBLIES: Lubricate once each week. Zerk fittings are provided for proper lube

application.

ROLLER CHAIN: Lubricate once each week. Use regular lube oil to oil all chain, including driver roller chain, main drive chain (oil cup provided), and power idler wheel chain.

DRIVE SHAFT BEARINGS: Lubricate as required. It is recommended that the track be kept clean of grease and dirt build up, and fresh lube be applied after each cleaning.

TOOL BOX DOORS: Lubricate as required. Hinges and locks should be lubricated with oil as needed for easy operation.

NOTE: All lubrication should be performed consistently to insure proper operation and extended life of equipment.

CAUTION: OILS SHOULD NOT BE MIXED. IF BRAND OR TYPE IS CHANGED, OLD OIL MUST BE DRAINED, ALL FILTERS CHANGED, AND NEW OIL USED THROUGHOUT THE SYSTEM.

HYDRA 985

JACKSTAND INSTALLATION

When installing any model Hogg and Davis Jack stand, the following procedure should be Used.

1. Determine If stand Is left or right. Hole in side of stand should line up with holding lug on trailer when teeth of stand engage with spring loaded ratchet pawl.

2. Insert stand into sleeve.

3. Install pad with pad bolt. Screw bolt all the way in, leaving Just loose enough for pad to swivel.

4. Screw stud Into stand until it wedges against the pad bolt. Tighten stud HARD AGAINST pad bolt. This LOCK bolt and eliminates loss of pad from bolt vibrating loose.

HYDRA 985

DRIVE ROLLER MAINTENANCE

The "heart" of any friction drive cable pulling machine is the rollers that transfers the power to the reel. This Is also usually the highest mortality Item on these units because they take the full brunt of all the pulling torque. The current production drive roller consists of two (2) pieces; a core and a ring. The ring consists of a special composition neoprene rubber compound (or optional urethane) molded to a steel ring. The core is made of steel, has bearing seats and a 24-tooth #60 sprocket welded on one end. The core and the ring are machined for press fit tolerance. When repairing roller due to "dead" or torn rubber, the core is pressed out of the old ring and new rings are pressed on. When replacing rollers, it is advised that they be replaced in horizontal pairs, i.e. both top rollers or both bottom rollers. This is so equal thickness of rubber is applied to each flange of the reel. If replaced in vertical pairs with new, thick rollers in one housing and old compressed rollers in the other housing, the power unit will have the tendency to cock under pressure. This tendency forces the rollers to be cut by the reel flange edges and can greatly reduce the expected life of the roller.

HYDRA 985

ACME ADJUSTING SCREW

Ninety to ninety-five percent of all damage to the acme adjusting screws on the above machine Is in the form of bending. Since it is nearly impossible to straighten them to work properly, it is necessary to replace them.

This damage can be prevented by employing one or more of the following simple precautions.

1. Instruct all operators, that after they have adjusted the drive roller housing to its proper

position, by use of the screw, to back-off one-half turn. This relieves that binding pressure between the acme nut and the drive roller housing, allowing the housing to "dolly" freely with the shape of the reel flange.

2. Keep the acme screws and drive shaft well greased. This not only allows the drive roller housing

to move laterally and "dolly" properly, but will also protect the parts from corrosion and rust.

3. Wipe grease on housing where acme nut makes contact. This will also allow housing to "dolly"

easier without binding.

4. Be sure acme screw brackets are adjusted to maintain a level setting throughout the drive roller

housings

DRAWDAR INSPECTION

1. Regularly inspect the drawbar for wear and damage. If wear exceeds 1/8", replace the drawbar.

2. Check all drawbar mounting fasteners for proper torque.

3. Do not modify or add to the product.

4. Do not weld on this product without written permission from the factory.

5. Be sure the drawbar size is compatible with the coupling device on the tow vehicle.

6. Do not damage the coupling components. Be particularly careful during coupling and

uncoupling.

7. Inspect the coupling device on the tow vehicle for proper locking prior to use.

8. Consult OSHA and DOT regulations and AMERICAN TRUCKING ASSOCIATION GUIDELINES FOR

COMPLETE OPERATING PROCEDURES.

HYDRA 985

MANDREL RACK STABILIZER INSTALLATION

The mandrel rack stabilizers are very critical to the proper operation of your trailer. One stabilizer Is attached to each mandrel rack. This stabilizer keeps the racks rigid and takes all the strain put against the racks when pressure Is applied by the power unit against the reel. Without the stabilizers, the power unit could apply enough pressure to bend or break the lifting cylinders upon which the mandrel racks ride. Therefore, it is Important that the stabilizers be properly installed

and maintained.

When It becomes necessary to replace a stabilizer due to damage or loss, the new stabilizer will be sent with the stop nut loose on the male rod portion of the stabilizer (Fig. 1).

The stabilizer should be bolted in position between the mandrel rack and the anchor bracket on the fender panel. The rack should then be raised to Its locked position and settled on the lock. The stabilizer should now be at a right angle to the rack and parallel to the top of the fender panel. The stop nut should be screwed on the male shaft until it sits against the female portion of the stabilizer. (Fig.2).

Locktite® can be used to properly set the stop nut. Proper Installation will assure protection against damage to lifting cylinders and stability for rack and reel mandrel.

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HOGG & DAVIS HYDRA 985 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual