Danuser POSTMASTER/SLAB BLASTER User manual

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Owner:
Date Purchased:
Model #: Serial #:
Manual #: 9MPOST2454659
Operator’s Manual
Danuser Machine Company, Inc.
500 East Third Street
P.O. Box 368
Fulton, Missouri 65251
Phone: [phone] Fax: [phone]
E-mail: [e-mail]
Website: www.danuser.com
MODELS
8000
9000
DANGER
POSTMASTER/
SLAB BLASTER

Dear Owner/Operator,
Thank you for purchasing this Danuser Postmaster/Slab Blaster. We appreciate your business.
Your safety as an operator of our product is very important to us. Therefore, before you
assemble, install, operate, maintain, service, remove, or move your Danuser Postmaster/
Slab Blaster, read and understand this manual thoroughly. If there is anything you do not
understand, immediately contact your dealer, or contact our factory direct.
Phone: [phone]
Fax: [phone]
E-mail: [e-mail]
Your satisfaction in the performance and longevity of our product is also very important to us
and can be prolonged by proper assembly, installation, operation, maintenance, service, and
removal as instructed in this manual.
Thank you again for your business and for your trust in our product. Please feel free to
contact us at any time for further assistance.
Sincerely,
Danuser Machine Company, Inc.
500 East 3rd Street, P.O. Box 368, Fulton, MO 65251
Phone: [phone] Fax: [phone]
E-mail: [e-mail] Website: www.danuser.com
Danuser Industrial Group

Improper operation of this Postmaster/Slab Blaster can cause
serious personal injury or death. Operation of this Postmaster/
Slab Blaster should only be done by a competent adult acting in
compliance with the Operator's Manual. Since Postmaster and
Slab Blaster operations are beyond our control, we disclaim all
liability for any damages, injuries or death which may result. 3
Page
LettertotheOwner/Operator ............................................ 2
Foreword............................................................ 3
Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Safety............................................................... 4
Specifications......................................................... 6
HydraulicRequirements ................................................ 7
Assembly&Installation................................................ 8
Operation............................................................ 11
Removal&Storage.................................................... 17
Troubleshooting....................................................... 18
Maintenance.......................................................... 19
Service.............................................................. 20
Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Decals &SafetySigns.................................................. 33
Warranty................................................... FormNo.3179
Please read this manual thoroughly!
Before you assemble, install, operate, maintain, service, remove, or move your Danuser
Postmaster/Slab Blaster, read this manual thoroughly. If there is anything you do not
understand, immediately contact your dealer, or call our factory direct at [phone].
Powered equipment can be dangerous if not assembled, installed, operated, maintained,
serviced, removed, or moved properly.
Warranty Registration
To activate your warranty coverage and to provide you with efficient customer service,
please fill out your WARRANTY REGISTRATION FORM. This form is included in your
unit’s paperwork package. If you did not complete a WARRANTY REGISTRATION
FORM or did not receive one, please call Danuser Machine Company, Inc. Your satisfaction
with our product and your safety as a user of our product are both very important to us.
Immediate hazard! Failure to understand and obey this
warning is likely to result in personal injury or death.
NOTE
This is important information for proper use of this
equipment. Failure to comply may lead to premature
equipment failure.
Failure to follow these instructions may cause damage
to the implement or the vehicle, or minor personal
injury.
Failure to follow these instructions may result in
personal injury or death.
Symbol Meaning
This SAFETY ALERT symbol identifies important safety messages. Carefully read
each safety message that follows. Failure to understand and obey a safety message,
or recognize a safety hazard, could result in injury or death to you or others around you.
The operator is ultimately responsible for the safety of himself, as well as others, in the
operating area of the Postmaster/Slab Blaster.
WARNING
DANGER
CAUTION
Foreword
Symbols
Table of
Contents
DANGER

4
Working with unfamiliar equipment can lead to careless injuries. Read and understand this manual and
the manual for your vehicle before assembling, installing, operating, maintaining, servicing, removing, or
moving this Postmaster/Slab Blaster. If there is anything in this manual you do not understand, contact
your dealer or Danuser Machine Company, Inc. The safe use of this attachment is strictly up to you, the
operator. If this attachment is used, loaned, or rented by any other person, it is the owner's responsibility
to make certain that the operator prior to operating:
• Reads and understands the Operator's Manuals
• Is instructed in safe and proper use
• The Postmaster/Slab Blaster is designed to be operated from the vehicle seat. Keep bystanders away
from the work area. Do not operate with another person in contact with any part of the Postmaster/
Slab Blaster.
• All operators of this attachment must read and understand this entire manual, paying particular
attention to safety messages and operation instructions, prior to assembling, installing, operating,
maintaining, servicing, removing, or moving the Postmaster/Slab Blaster.
• Please remember it is also important that you read, understand, and follow safety signs on the
attachment. Clean or replace all safety signs if they cannot be clearly read and understood. They are
there for your safety as well as the safety of others. Danuser Machine Company, Inc. will furnish
new safety signs upon request at no charge.
• All things with moving parts are potentially hazardous. There is no substitute for a cautious, safe-
minded operator who recognizes potential hazards and follows reasonable safety practices.
• Personal protection equipment including hard hat, safety glasses, safety shoes, gloves, and ear
plugs are recommended during assembly, installation, operation, maintenance, service, removal, or
movement of the attachment.
• When the use of hand tools is required to perform any part of assembly, installation, operation,
maintenance, or service of the attachment, be sure the tools used are designed and recommended by
the tool manufacturer for that specific task.
• Never check pressurized system for leaks with your bare hand. Wear proper hand and eye protection
and use wood or cardboard when searching for suspected leaks. Oil escaping from pinhole leaks
under pressure can penetrate skin and create a serious medical emergency. If any fluid is injected
into the skin, gangrene, blood poisoning, even death may result. Obtain medical attention
immediately.
• Always use two people to handle heavy, unwieldy components during assembly, installation,
maintenance, service, removal, or movement of the Postmaster/Slab Blaster.
• Never place any part of your body where it would be in danger if movement should occur during
assembly, installation, operation, maintenance, service, removal, or movement of the Postmaster/Slab
Blaster.
• Only properly trained people should operate this equipment. Do not allow anyone who has not read
this entire manual and understands the safety rules, safety signs, and operation instructions to use this
attachment.
• Never allow children to operate or be around the Postmaster/Slab Blaster.
• Do not allow riders on the equipment at any time. There is no safe place for any riders.
• Never use alcoholic beverages or drugs which can hinder alertness or coordination while operating
this equipment. Consult your doctor about operating this equipment while taking prescription
medications.
WARNING
Safety

• Consult local utility companies to make certain there are no buried gas lines, electrical cables, etc., in
the work area before beginning operation.
• Do not drive posts near underground utility lines.
• Stay away from power lines when transporting, raising, or operating the Postmaster/Slab Blaster.
• Before you operate the attachment, check over pins and connections to be sure all are securely in
place. Make sure Postmaster/Slab Blaster is securely latched to the vehicle.
• Keep hands, feet, hair, jewelry, and clothing away from all moving and/or rotating parts.
• Never place yourself between the vehicle and the attachment.
• Never allow anyone under the attachment at any time.
• Keep clear of the Postmaster/Slab Blaster while in operation. Never position, align, or support the
post by hand or with any tool when the hammer is in operation.
• Do not exceed the vehicle's rated operating load. Use sufficient counterweights. Move the vehicle
slowly when the attachment is raised.
• Carry the load low. A heavy load can cause instability of the vehicle. Use extreme care during
travel. Slow down on turns and watch out for bumps. Use all safety devices, including a seat belt, as
recommended in the vehicle operator’s manual.
• Do not operate the Postmaster/Slab Blaster on steep hillsides. When operating the Postmaster/Slab
Blaster on uneven or hilly terrain, position the vehicle with the attachment uphill. With the
attachment downhill, the vehicle could tip when attempting to raise the attachment. Consult your
vehicle operator’s manual for maximum incline allowable.
• Always shut off the vehicle engine and remove the key before dismounting the vehicle, adjusting the
attachment, or servicing the Postmaster/Slab Blaster. Never leave equipment unattended with the
vehicle running.
• Never attempt repairs or adjustments while the equipment is in operation.
• Before disconnecting hydraulic lines or fittings be sure to relieve all pressure by cycling all hydraulic
controls after shutdown. Remember hydraulic systems are under pressure whenever the engine is
running and may hold pressure after shutdown.
• Always use care when operating the Postmaster/Slab Blaster. Most accidents occur because of
neglect or carelessness.
Safety is a primary concern in the design, manufacture, sale, and use of Postmasters/Slab Blasters.
Danuser confirms to you, our customer, our concern for safety.
5
Safety
(continued)

6
Specifications
• Round, square, or H-beam heads available for wood or steel posts, preventing post
mushroom. T-post adapter and custom heads up to 8" x 8" are also available.
• Drive up to 60 post an hour.
• Slab Blaster breaks up to 9" thick concrete.
Model 8000 Model 9000
Overall Length (A) 48"
Overall Width (B) 24"
Overall Height (C) 64" 90"
Hammer Weight (POSTMASTER) 275 lbs. (700 lbs. max.)
Hammer Weight (SLAB BLASTER) 400 lbs. (700 lbs. max.)
Length of Stroke 36" 56"
Max. Strokes Per Minute 50
Hydraulic Requirements 12 GPM
2000 PSI
Posts (Wood/Steel) 3" - 8"

Filtration Requirements:
• A filter of, at least, 25 micron filtration is required. A filter capable of 10 micron
filtration is preferred. The majority of paper type filters are 25 microns or better.
• A low pressure type filter can be installed in the return line from the control valves to
the sump. A low pressure type filter can, also, be installed in the sump or pump intake
line, but must be sized large enough to avoid starving the pump.
• A high pressure type filter can be used between the pump and the control valves.
• If the source of the hydraulic power does not have a filter, it will be necessary to install
one at some point in the system so, at least, part of the hydraulic oil is being filtered
whenever the system is operating. After a filter is installed and before attaching the
Postmaster/Slab Blaster, the entire hydraulic system should be drained, filled with new
oil, and operated for 30 minutes or until the system is warm. During this run time,
operate all valves, cylinders, and hydraulic motors on the attachment.
Pressure and Flow Requirements:
• The Postmaster/Slab Blaster is designed to operate at 12 GPM and 2000 PSI.
Valve Requirements:
• The hydraulic system used to power the Postmaster/Slab Blaster should be equipped
with a four-way valve large enough to carry full pump outlet without restricting flow
and causing oil heating.
• The four-way valve requires a relief valve which will open and relieve extreme
pressures between the Postmaster/Slab Blaster and control valve, even when the control
valve is in a neutral position. This feature can be obtained by connecting two external
relief valves between the main lines running from the control valve to the Postmaster/
Slab Blaster in such a way that high pressure in either line will be relieved to the other
line.
Hydraulic Fluid Selection Requirements:
• Premium grade petroleum based fluids will provide the best performance.
• Fluids that contain anti-wear agents, rust inhibitors, anti-foaming agents, and oxidation
inhibitors are recommended.
• The viscosity of the fluid should never fall below 70 SUS (13 cST). The best
viscosity range of the Postmaster/Slab Blaster is 100-200 SUS (20-43 cST).
7
NOTE The life of the hydraulic motor is almost entirely dependent upon cleanliness
of the oil. Instructions in your vehicle operator’s manual regarding filter and
oil changes should be carefully followed. Even small amounts of dirt in the
hydraulic oil can cause premature motor failure that is not covered by warranty.
Hydraulic
Requirements

8
Prepare the Vehicle
Read and understand the manual for your vehicle before assembling or installing the
Postmaster/Slab Blaster. The vehicle must be equipped with a universal quick attach hitch
and auxiliary hydraulics. The use of the Postmaster/Slab Blaster may require the addition of
counterweights to ensure the attachment does not exceed the rated capacity of your vehicle.
Add Additional Weight
Adding additional weight, up to 700 lbs. total hammer weight, is recommended on both the
Postmaster and Slab Blaster, except when using a T-post adapter. Add weight in a variety of
ways: logging chain, metal punch slugs, lead tire weights, etc. Do not use concrete or sand.
STEP 1: If your unit was shipped in the upright position, remove the lag bolt securing the
Postmaster/Slab Blaster to the pallet.
STEP 2: Remove the metal bands from around the mounting plate and pallet.
STEP 3: If you have received a Postmaster with Grapple, remove the Grapple from the
Postmaster. The Grapple will be installed later.
STEP 4: Install the Postmaster/Slab Blaster by following your vehicle operator’s manual
for installing an attachment. After making sure the attachment is securely latched
to the vehicle, remove the shipping pallet.
STEP 5: Remove the hydraulic hoses from the quick attach plate hose holder, and use the
quick couplers to connect the hydraulic hoses to the vehicle's auxiliary hydraulics.
STEP 6: Remove the transit bolt from the top left of the hammer rails.
Assembly &
Installation
Because of the weight of
some components, and
because some
components are difficult
to balance, two people are
required for safe
assembly and installation
of this equipment.
CAUTION
WARNING
DANGER
Do not exceed the vehicle's rated operating load. If
necessary, use sufficient counterweights.
If you have purchased a Postmaster with Grapple, it is recommended you use
your Postmaster without the Grapple a few times before installing the Grapple.
The Grapple installation instructions are located in the Operation section of this
manual following the Postmaster operation instructions.
NOTE
Make sure the Postmaster/Slab Blaster is securely latched
to the vehicle. Failure to do so could result in separation of
the attachment from the vehicle.
WARNING
Remember hydraulic systems are under pressure whenever
the engine is running and may hold pressure after
shutdown. Before connecting or disconnecting hydraulic
hoses, be sure to relieve all pressure by cycling all
hydraulic controls after shutdown.
WARNING
CAUTION
Do not route the hydraulic hoses through the quick attach
plate hose holder at this time. Damage to the hydraulic
hoses will occur.
WARNING
Personal protection
equipment including hard
hat, safety glasses, safety
shoes, gloves, and ear
plugs are recommended
during assembly,
installation, operation,
maintenance, service,
removal, or movement of
the attachment.

9
STEP 7: Ensure the safety catch is in place. The safety catch prevents the hammer from
sliding out of the Postmaster/Slab Blaster.
STEP 8: Raise the Postmaster/Slab Blaster in the air, and tilt it forward 90°. Watch for any
obstructions or pinching of hydraulic hoses.
STEP 9: Shut off the vehicle engine.
STEP 10: Grease the exposed hammer rails.
STEP 11: Again ensure the safety catch is in place, and pull the hammer out towards you
until it hits the safety catch. Grease the rest of the hammer rails, and oil the chain
drive.
STEP 12: Set the hydraulic flow control at 3.
Do not operate the Postmaster/Slab Blaster without first
setting the flow control. Serious damage to the drive
assembly may occur.
Assembly &
Installation
(continued)
CAUTION
Always reinstall the transit bolt before transporting or
shipping the Postmaster/Slab Blaster. This bolt prevents
the hammer from sliding during transport or shipping.
Do not tilt or operate the Postmaster/Slab Blaster without
the safety catch in place. The hammer could slide out of
the Postmaster/Slab Blaster and cause serious injury or
death.
WARNING
CAUTION
Transit Bolt
Safety Catch
Flow
Control

10
STEP 13: Start the vehicle. Running at full throttle, engage the auxiliary hydraulics. Note
the direction of the chain rotation (visible from the operator’s seat). The chain
should be rotating from the bottom to the top. If it is not, reverse the hydraulic
hoses.
STEP 14: Check the hydraulic system for leaks.
STEP 15: After the correct chain rotation has been achieved, count the number of rotations
of the pick-up link per minute.
STEP 16: The number of rotations equals the number of hammer strikes per minute. If you
want to increase the speed, then increase the flow control setting by 1 increment
at a time until you reach the desired number of rotations per minute. DO NOT
exceed the maximum of 50 rotations per minute.
Keep hands and loose clothing clear of the chain drive
assembly. Severe personal injury could occur.
WARNING
Exceeding 50 rotations per minute will cycle the chain faster
than the hammer drops, making the chain come into contact
with the hammer as it is still falling. This will cause severe
damage to the drive assembly.
WARNING
If the Grapple is installed and the chain is not rotating at all, reverse the
hydraulic hoses.
NOTE
Assembly &
Installation
(continued)
Remember hydraulic systems are under pressure whenever
the engine is running and may hold pressure after
shutdown. Before connecting or disconnecting hydraulic
hoses, be sure to relieve all pressure by cycling all
hydraulic controls after shutdown.
WARNING
Never check pressurized system for leaks with your bare
hand. Wear proper hand and eye protection and use wood
or cardboard when searching for suspected leaks. Oil
escaping from pinhole leaks under pressure can penetrate
skin and create a serious medical emergency. If any fluid
is injected into the skin, gangrene, blood poisoning, even
death may result. Obtain medical attention immediately.
WARNING
Pick-Up Link Hammer
Vehicle

11
After the post is in position, the second person must move
away from the Postmaster and vehicle.
Operation
Postmaster
STEP 17: After setting the flow control, turn off the auxiliary hydraulics. Slide the hammer
back into the Postmaster/Slab Blaster.
STEP 18: Slowly tilt the Postmaster/Slab Blaster back to a vertical position.
STEP 19: Shut off the vehicle, and disconnect the hydraulic hoses. Route the hydraulic
hoses through the quick attach plate hose holder, and reconnect the hydraulic
hoses to the vehicle auxiliary hydraulics.
If you have purchased a Postmaster with Grapple, we recommend you use your Postmaster
without the Grapple a few times before installing the Grapple.
STEP 1: Without the Grapple, the Postmaster requires a second person to position the post.
This person will set the post at the desired location and grasp the post securely,
making sure his hands are at least 30 inches from the top of the post.
STEP 2: After the post is in position, move the vehicle with the arms raised and position the
Postmaster directly over the top of the post.
STEP 3: Lower the Postmaster onto the top of the post, ensuring the post is inside of the
positioning collar. Continue lowering until the collar and head assembly have
moved up approximately 2 inches. Gauge this measurement by watching the post
guide on the back of the attachment, visible from the vehicle operator’s seat.
Do not operate the Postmaster/Slab Blaster with the transit
bolt installed.
CAUTION
Assembly &
Installation
(continued)
DANGER
Before you operate the attachment, check over pins and
connections to be sure they all are securely in place. Make
sure the Postmaster/Slab Blaster is securely latched to the
vehicle.
DANGER
When using a second person, do not turn on the auxiliary
hydraulics until the second person is clear from the work
area.
DANGER
The Postmaster is
designed to be operated
from the vehicle seat.
Keep bystanders away
from the work area. Do
not operate with another
person in contact with any
part of the Postmaster.
DANGER DANGER
Consult local utility companies to make certain there are
no buried gas lines, electrical cables, etc., in the work
area before beginning operation. Do not drive posts near
underground utility lines.
Stay away from power
lines when transporting,
raising, or operating the
attachment.
DANGER

12
STEP 4: After the second person has cleared the area, continue lowering the Postmaster
onto the post approximately 24 inches. Gauge this measurement by noting when
 thepostguideisapproximately6inchesabovetherstreinforcementplate.
STEP 5: Move the vehicle slowly left, right, forward, or backward as needed until the post
appears vertical to the ground.
STEP 6: The Postmaster can now be activated by turning the auxiliary hydraulics to
the forward position. Drive the post into the ground until the post guide is
approximately 6 inches above the rubber cushion. If needed, shut off the auxiliary
hydraulics and reposition the vehicle to ensure the post is driven into the ground
straight.
STEP 7: Repeat STEPS 4 and 6 until the post has been driven to the desired depth.
STEP 8: Shut off the auxiliary hydraulics, raise the Postmaster until the post is cleared,
and move to the next post.
Once you have become comfortable with the operation of the Postmaster and are driving
posts in straight, you are ready to install your Grapple.
STEP 1: Lower the Postmaster to the ground, and shut off the vehicle.
Operation
(continued)
Failure to lower the Postmaster as the post guide nears the
rubber cushion will result in the hammer bottoming out.
Although occasional bottoming out of the hammer will give
the operator a jolt, it will not (under normal load conditions)
damage the Postmaster. However, repeated bottoming out
of the hammer will cause structural damage and excessive
wear to the Postmaster and vehicle lift arms.
CAUTION
Assembly &
Installation
Grapple
Remember hydraulic systems are under pressure whenever
the engine is running and may hold pressure after
shutdown. Before connecting or disconnecting hydraulic
hoses, be sure to relieve all pressure by cycling all
hydraulic controls after shutdown.
WARNING
BACK OF POSTMASTER
Reinforcement Plate
Post Guide (when moved
6" above reinforcement plate)
Post Guide
(when moved up 2")
Rubber Cushion
Quick Attach Plate

13
STEP 2: Set the Grapple down in front of the Postmaster, aligning the square tubes of the
Grapple with the square tubes of the Postmaster (one on either side of the chain
guard and drive assembly).
STEP 3: Remove the hitch pins from the Grapple mounting tubes.
STEP 4: Slide the square tubes of the Grapple into the tubes of the Postmaster. Align the
mounting holes, and insert the provided hitch pins and hair pins.
STEP 5: Route the hydraulic hoses for the Grapple through the quick attach plate hose
holder, and connect the couplers to the corresponding couplers located directly
 belowtheowcontrol.
STEP 6: The Grapple hydraulic system has been shipped dry and will require the auxiliary
 hydraulicsbeactivatedslowlytollthehosesandcylinder.(TheGrapplemayact
erratic until all the air is out of the hydraulic system.)
STEP 7: With the vehicle running at slow idle, turn the auxiliary hydraulics to the forward
position for a few seconds at a time until the Grapple arms raise. (Be cautious
when the Grapple is raised and the jaws are completely open, as the hammer will
rise.)
STEP 8: Reverse the auxiliary hydraulics until the jaws close.
STEP 9: Repeat STEPS 7 and 8 until Grapple operation is smooth.
STEP 10: Once you have accomplished smooth operation and the Grapple jaws are closed,
return the auxiliary hydraulics to the forward position until the hammer starts to
raise. This will raise and open the Grapple jaws.
Assembly &
Installation
(continued)
Operation
With Grapple
Repeated bottoming out of the hammer will cause severe
damage to the attachment and will void all warranties.
CAUTION
Because of the weight of
some components, and
because some
components are difficult
to balance, two people are
required for safe
assembly and installation
of this equipment.
CAUTION
Personal protection
equipment including hard
hat, safety glasses, safety
shoes, gloves, and ear
plugs are recommended
during assembly,
installation, operation,
maintenance, service,
removal, or movement of
the attachment.
WARNING
Do not operate the Postmaster/Slab Blaster with the transit
bolt installed.
CAUTION
DANGER
Before you operate the attachment, check over pins and
connections to be sure they all are securely in place. Make
sure the Postmaster/Slab Blaster is securely latched to the
vehicle.
The Postmaster is
designed to be operated
from the vehicle seat.
Keep bystanders away
from the work area. Do
not operate with another
person in contact with any
part of the Postmaster.
DANGER
DANGER
Consult local utility companies to make certain there are
no buried gas lines, electrical cables, etc., in the work
area before beginning operation. Do not drive posts near
underground utility lines.
Stay away from power
lines when transporting,
raising, or operating the
attachment.
DANGER

14
Picking up a post from the ground may require a few tries to get it perfect. We recommend
attaching a 24 inch length of deck chain to the hook provided next to the bottom of the drive
assembly. This will help the operator align the Grapple jaws with the head of the post,
ensuring a perfect pick-up of the post every time.
STEP 1: Set the post(s) on the ground with the head(s) of the post(s) facing the vehicle.
STEP 2: Raise the Postmaster approximately 2 feet off the ground, making sure the Grapple
arms are in the up position and the jaws are open.
STEP 3: Drive the vehicle forward and position the Postmaster over the head of the post.
Align the end of the guide chain approximately 1 to 2 inches to the right of the
head of the post.
STEP 4: After the vehicle is in position, lower the lift arms until the Postmaster is resting
lightly on the post, allowing for the grapple to center the post.
STEP 5: Turn the auxiliary hydraulics to the reverse position until the jaws close on the
post.
STEP 6: Lift the Postmaster 4 to 6 inches off the ground. Turn the auxiliary hydraulics to
the reverse position until the post is securely held by the Grapple.
STEP 7: Raise the arms of the vehicle until the post has swung down and is clear of the
ground. This should set the head of the post into the positioning collar. If the
post is jammed against the front or back of the positioning collar, DO NOT release
the jaws. Back up the vehicle while lowering the post to the ground. Once the
post is on the ground, open the jaws.
STEP 8: When the post has been properly positioned in the positioning collar, move the
vehicle to the desired location, and lower the lift arms until the tip of the post is
touching the ground.
STEP 9: Brieyturntheauxiliaryhydraulicstotheforwardpositionjustenoughtorelease
the hydraulic pressure. You do not want the jaws to open at this time. Releasing
the hydraulic pressure should loosen the jaws enough that the post will slide
through but still maintain the spring tension that is holding the post in position.
STEP 10: Align the post by moving the vehicle and using the guide chain as a plum line.
Operation
(continued)
Opening the jaws of the Grapple when the post is not in the
positioning collar could cause the post to fall back toward
the vehicle. Serious injury to the operator could occur.
WARNING
If the post was jammed on the back of the positioning collar (toward the vehicle),
shorten the guide chain one link at a time. Repeat STEPS 3 - 7 until the post is
positioned in the collar. If the fence post was jammed on the front of the
positioning collar, lengthen the guide chain one link at a time. Repeat STEPS 3 -
7 until the post is positioned in the collar.
NOTE
This guide chain may need to be adjusted up or down in length to compensate for
the arc of the vehicle’s lift arms.
NOTE
You do not need to center the jaws over the post since the grapple is self aligning.
NOTE

15
STEP 11: Lower the Postmaster onto the post approximately 24 inches. Reposition the
vehicle using the guide chain as a plum line.
STEP 12: Turn on the auxiliary hydraulics in the forward position. This will open the jaws,
swing the Grapple out of the way, and start the hammer.
STEP 13: The Postmaster can now be activated by turning the auxiliary hydraulics to
the forward position. Drive the post into the ground until the post guide is
approximately 6 inches above the rubber cushion. If needed, shut off the auxiliary
hydraulics and reposition the vehicle to ensure the post is driven into the ground
straight.
STEP 14: Repeat STEPS 11 and 13 until the post has been driven to the desired depth.
STEP 15: Shut off the auxiliary hydraulics, raise the Postmaster until the post is cleared,
and move to the next post.
STEP 1: Grease the 2 grease zerks on the hydraulic cylinder.
STEP 2: Attach the wiring harness to the diverter valve on the Postmaster.
STEP3: Route the wires along the hoses to the vehicle, and secure them with zip-ties.
Operation
(continued)
CAUTION
Failure to lower the Postmaster as the post guide nears the
rubber cushion will result in the hammer bottoming out.
Although occasional bottoming out of the hammer will give
the operator a jolt, it will not (under normal load conditions)
damage the Postmaster. However, repeated bottoming out
of the hammer will cause structural damage and excessive
wear to the Postmaster and vehicle lift arms.
Assembly &
Installation
Tilt
BACK OF POSTMASTER
Reinforcement Plate
Post Guide (when moved
6" above reinforcement plate)
Post Guide
(when moved up 2")
Rubber Cushion
Quick Attach Plate
Remove Cover

16
STEP 4: Route the control portion of the wiring harness along the loader arm of the vehicle
and into the cab, and secure the wiring with zip-ties. Mount the switch out of the
way of other controls.
STEP 5: Connect the remainder of the wiring harness to a 12 volt power supply. If
necessary, consult your dealer.
Tilt the Postmaster by holding the switch in either direction, and activate the auxiliary
hydraulics.
The Slab Blaster operates basically the same as the Postmaster with the exception that the
Slab Blaster has a one-piece hammer. It does not have a separate head and hammer assembly.
The Slab Blaster hammer has approximately 9 inches of wearable, hardened steel hammer
point.
STEP 1: Move the vehicle into position with the arms raised and the Slab Blaster
positioned directly over the concrete you wish to break up.
STEP 2: Lower the Slab Blaster until it is approximately 2 to 3 inches off of the concrete.
This means the hammer will be slightly pushed up into the hammer rails.
Operation
Slab Blaster
Do not operate the Postmaster/Slab Blaster with the transit
bolt installed.
CAUTION
DANGER
Before you operate the attachment, check over pins and
connections to be sure they all are securely in place. Make
sure the Postmaster/Slab Blaster is securely latched to the
vehicle.
The Postmaster is
designed to be operated
from the vehicle seat.
Keep bystanders away
from the work area. Do
not operate with another
person in contact with any
part of the Postmaster.
DANGER DANGER
Consult local utility companies to make certain there are
no buried gas lines, electrical cables, etc., in the work
area before beginning operation. Do not drive posts near
underground utility lines.
Stay away from power
lines when transporting,
raising, or operating the
attachment.
DANGER
Operation
With Tilt
Keep wiring a safe distance from hot components such as a heater or exhaust.
NOTE
CAUTION
Failure to lower the Slab Blaster 2 to 3 inches from the
ground will result in the hammer hitting the rubber cushion.
Although occasional bottoming out of the hammer will give
the operator a jolt, it will not (under normal load conditions)
damage the Slab Blaster. However, repeated bottoming out
of the hammer will cause structural damage and excessive
wear to the Slab Blaster and vehicle lift arms.
Assembly &
Installation
(continued)

17
Removal &
Storage
STEP 3: The Slab Blaster can now be activated by turning the auxiliary hydraulics to the
forward position.
Before storage, the Postmaster/Slab Blaster should be thoroughly cleaned, washing off all
dirt and grime. If you have a Grapple or Tilt, coat the exposed portions of the cylinder rod
withgrease.Lubricatethedrivechain,chaincoupler,andallgreasettings.Makesurethe
hydraulic system is properly sealed against contaminates entering the unit. Always store the
Postmaster/Slab Blaster in a dry, covered location.
STEP 1: LowerthePostmaster/SlabBlasterontoaat,levelsurface.
STEP 2: Shut off the vehicle engine, lower the arms, relieve all hydraulic pressure (by
activating the vehicle controls), and remove the vehicle key before leaving the
vehicle seat.
STEP 3: Disconnect the hydraulic hoses from the vehicle's auxiliary hydraulics.
STEP 4: Follow your vehicle operator's manual for removing an attachment.
DANGER
Never allow anyone under the attachment at any time.
Before disconnecting hydraulic lines or fittings be sure
to relieve all pressure by cycling all hydraulic controls
after shutdown. Remember hydraulic systems are under
pressure whenever the engine is running and may hold
pressure after shutdown.
WARNING
Connect the quick couplers together to prevent contaminants from entering the
Postmaster/Slab Blaster hydraulic system.
NOTE
The Slab Blaster will break up approximately ten square feet of concrete per
minute. The thickness (up to 9 inches) and the toughness of the concrete will
affect your speed.
NOTE
Operation
(continued)

18
a) Flow control setting too low Increase flow control setting.
b) Fittings or connections Replace with proper fittings.
are too small or incompatible
c) Line restrictions Clear lines.
d) Dirty oil or oil filter Change oil and oil filter according to
vehicle manufacturer’s
recommendation.
e) Hydraulic pump worn See your dealer for repairs.
or damaged
a) Flow control setting too high Decrease flow control setting.
a) Fittings loose or damaged Tighten or replace fittings.
b) Hoses loose or damaged Tighten or replace hoses.
c) Hydraulic motor seals See your dealer for repairs.
worn or damaged
d) Hydraulic cylinder seals See your dealer for repairs.
worn or damaged
a) Low quantity of Fill reservoir to proper level.
hydraulic oil Increase reservoir storage capacity.
b) Improper oil Replace with proper oil.
c) Dirty oil or oil filter Change oil and oil filter according
to vehicle manufacturer’s
recommendation.
d) Fittings loose or damaged Tighten or replace fittings.
e) Hoses loose or damaged Tighten or replace hoses.
f) Improper hose size Check hose diameter and length
requirements.
a) Hydraulic relief pressure Adjust vehicle hydraulic relief
setting too high pressure setting to within drive
unit specifications.
b) Hoses worn or damaged Replace hoses.
c) Hose rating too low for Replace with hoses with
hydraulic system pressure working pressure rated higher
than vehicle hydraulic pressure.
d) Hoses pinched Reroute hoses.
For additional assistance, please call your dealer or contact Danuser direct:
Phone: [phone]
Fax: [phone]
E-mail: [e-mail]
PROBLEM POSSIBLE CAUSE SOLUTION
Troubleshooting
Slow Speed
Fast Speed
Oil Over
Heating
Hydraulic
Hose Failure
Oil Leaks

CHECK FOR CLEAN HYDRAULIC OIL
The majority of all hydraulic component failures are caused by contamination of the
hydraulic oil. At all times, keep dirt and other contaminates from entering the hydraulic
system during connecting and disconnecting the hydraulic system. Always use dust caps
and plugs on all quick disconnects when not in use.
CHECK ALL HYDRAULIC HOSE ASSEMBLIES
Check for cracked or brittle hoses. Replace hoses immediately if cracked or brittle.
Replacement of hoses before failure will prevent loss of hydraulic oil, hydraulic oil
contamination, and component damage caused by cavitation.
CHECK ATTACHMENT AND ALLACCESSORIES
Check all bolts and fasteners for tightness. Visually inspect the attachment for damage.
Visually check the drive chain for alignment. Check the flow control mounting bolts for
damage or breakage, and replace if necessary. (Repeated bottoming out of the attachment is
the only cause of damage to the mounting bolts. If mounting bolts are damaged or breaking,
check the complete attachment for structural damage and review operating procedures.)
CHECK RUBBER CUSHION
Visually check the rubber cushion for damage and wear. (Repeated bottoming out of the
unit is the only cause of wear or damage to the rubber cushion. If the rubber cushion is
showing wear or damage, check the complete attachment for structural damage and review
operating procedures.)
GREASE ZERKS
Grease the zerks on each of the 4 bearings. Grease the zerks on both ends of the Grapple's
pivot linkage.
LUBRICATE ATTACHMENT
Lubricate the hammer rails. Lubricate the drive chain and chain coupling with a high
quality commercial chain lubricant.
CHECK ATTACHMENT AND ACCESSORIES
Visually inspect the nylon guide plate for wear. Replace the nylon guide plate if the drive
chain is hitting the flathead socket capscrews. Check the bolts on the Postmaster upper head
assembly for tightness.
DAILY
Maintenance
EVERY 40 HOURS
19

20
Service
STEP 1: Remove the safety catch pin from the top of the frame. Insert a hook into the chain
links welded to the top of the hammer, and lift out the hammer with a hoist,
forklift, or another vehicle. Lay the hammer on the ground.
STEP 2: Disconnect the hydraulic hoses, and remove the Postmaster/Slab Blaster from the
vehicle.
STEP 3: Carefully lay down the Postmaster/Slab Blaster on its back.
STEP 4: Remove the front cover.
STEP 5: Remove the chain. (The drive chain has been welded together and must be cut off.)
STEP 6: Loosen the bolts on the bearings, allowing the sprockets to slide closer together for
reassembly.
STEP 7: Check the alignment of the sprockets by measuring the distance from each side
of the sprocket to the frame on the upper and lower sprocket. Then place a straight
edge on the side of the sprockets from the upper sprocket to the lower sprocket to
ensure straight alignment.
REPLACING THE DRIVE CHAIN
Check sprockets and nylon guide plate for wear and replace if necessary.
NOTE
Never attempt repairs or adjustments while the equipment
is in operation.
DANGER
Because of the weight of
some components, and
because some
components are difficult
to balance, two people are
required for safe
assembly and installation
of this equipment.
CAUTION
Personal protection
equipment including hard
hat, safety glasses, safety
shoes, gloves, and ear
plugs are recommended
during assembly,
installation, operation,
maintenance, service,
removal, or movement of
the attachment.
WARNING
Equal Measurements
Equal Measurements
(both sides)
Bearing
Bearing
Shaft
Equal Measurements
(both sides)
Frame
Shaft
Upper
Sprocket
Straight
Edge
Lower
Sprocket