Arrow Master 1350 User manual

Publication No. 5000054
(Revised 09/12)
ARROW - MASTER
MOBILE HYDRAULIC HAMMER
MODEL 1350
Service Manual
SERIAL NUMBER:
SOLD AND
SERVICED BY:
ARROW-MASTER, INCORPORATED
1201 Seventh Street !East Moline, IL 61244
www.arrowmaster.com

5000054 09/12
Page i-1
Table Of Contents
Bolt and Cap Screw Torque Specification ...................................................i-3
Wheel Lug Nut Torque Specification .......................................................i-3
Adjustments .....................................................7-1
CABLELENGTH ................................................................ 7-1
REPLACINGCABLE ............................................................. 7-1
CROSS-SLIDE BEARING ADJUSTMENT ............................................. 7-5
CARRIAGE BEARING END PLAY ................................................... 7-5
SIDESHIFTCHAIN............................................................... 7-6
PROXIMITYSENSOR ............................................................ 7-7
Hydraulic Pressure Adjustment ......................................8-1
REQUIREDEQUIPMENT ......................................................... 8-1
HAMMER LIFT CIRCUIT .......................................................... 8-1
CONTROL CIRCUIT MAIN RELIEF ...............................................8-2,8-8
SIDESHIFTCONTROL-VALVERELIEF ...........................................8-4,8-9
TILT AND LAYBACK CONTROL-VALVE RELIEF ....................................... 8-4
PILOT-CIRCUIT RELIEF (electronic stroke control) ..................................8-5,8-9
PILOT-CIRCUIT RELIEF (mechanical stroke control) .................................... 8-5
VALVESPOOLCENTERINGADJUSTMENT.......................................... 8-6
CREEPER VALVE RELIEF ....................................................... 8-10
Mechanical System ................................................9-1
ENGINE REPAIR ................................................................ 9-1
SERPENTINEBELTREPLACEMENT ............................................... 9-1
TRANSMISSION, CLUTCH, AXLES, BRAKES, AND STEERING VALVE .................... 9-2
CREEPER DRIVE ............................................................... 9-2
AdjustmentofGearBacklash .................................................... 9-2
Creeper-Drive Motor and Pinion Replacement ....................................... 9-4
Creeper-Drive Pinion Shaft Replacement ........................................... 9-5
Creeper-Drive Bull Gear Replacement ............................................. 9-5
Creeper-Drive Housing Support Mount Replacement .................................. 9-7
TransmissionOutput-ShaftSealReplacement ....................................... 9-7
ENGINE,RADIATOR,ANDMOUNTS................................................ 9-8
Radiator Upper Mount Replacement ............................................... 9-8
Radiator and Lower Radiator Mount Replacement .................................... 9-9
EngineReplacement ........................................................... 9-9
HAMMERWEIGHTREPLACEMENT ............................................... 9-12
LEADREPLACEMENT .......................................................... 9-12
SIDESHIFTCARRIAGEREPLACEMENT............................................ 9-14
CROSS-SLIDE BEARING BLOCK REPLACEMENT .................................... 9-14
HAMMERWEIGHTSHIM-KITINSTALLATION........................................ 9-16

5000054 05/07
Page i-2
Hydraulic System ................................................10-1
PUMPSANDGEARMOTORS ..................................................... 10-1
HAMMERVALVE............................................................... 10-1
Valve-Spool Seals and Servo-Valve Assembly Replacement ........................... 10-1
Hammer Relief Valve and Seat Replacement ....................................... 10-3
Load Check Valve Replacement ................................................. 10-3
CONTROL-CIRCUIT RELIEF VALVE ............................................... 10-4
HAMMER-CIRCUIT RELIEF VALVE ................................................ 10-4
PILOT-SYSTEM ROTARY VALVE .................................................. 10-5
CREEPER-CONTROL VALVE ..................................................... 10-7
CREEPER-BYPASS VALVE ...................................................... 10-8
CUSHIONVALVE(crossoverrelief)................................................. 10-9
AUTO-MANUALVALVE......................................................... 10-10
FUNCTION-CONTROL VALVES (other than auto-manual) .............................. 10-13
PILOT-VALVE ASSEMBLY (electronic stroke only) .................................... 10-13
FLOWDIVIDER(priorityvalve) ................................................... 10-14
SIDESHIFTMOTORANDSPROCKETREPLACEMENT............................... 10-16
LAYBACK CYLINDER .......................................................... 10-17
TILTCYLINDER............................................................... 10-19
STROKE-ADJUSTANDCABLE-ADJUSTCYLINDERS ................................ 10-19
HAMMERLIFTCYLINDER(automaticcylinder) ...................................... 10-22
HYDRAULIC DIAGRAM (mechanical stroke) ........................................ 10-31
HYDRAULICDIAGRAM(electronicstroke) ......................................... 10-32
Electrical System ................................................11-1
ELECTRONICCONTROLSTATION................................................ 11-1
ElectronicControlStationReplacement ........................................... 11-1
ProximitySensor ............................................................. 11-1
ELECTRICAL DIAGRAM (firewall gauges) ........................................... 11-2
ELECTRICAL DIAGRAM (front panel gauges) ........................................ 11-4
Trouble Shooting ................................................12-1
General Trouble Shooting charts ................................................. 12-1
ELECTRONICSTROKECONTROLTROUBLESHOOTING ............................. 12-8
General .................................................................... 12-8
SensorProblems............................................................. 12-8
ReplacingtheSensor ......................................................... 12-8
Voltage Check ............................................................... 12-8
Electronic Stroke Control Trouble Shooting Chart .................................... 12-9
Solenoid Valve .............................................................. 12-11
ValveSwitch ............................................................... 12-11
ElectronicControlStation ..................................................... 12-11
Stroke Length Control ........................................................ 12-11
GovernorSetting ............................................................ 12-11
PartsListing ............................................................... 12-12

5000054 05/07
Page i-3
Table III - Bolt and Cap Screw Torque Specifications
MATERIAL
SPEC
AND
MARKING
Hex Head Bolts & Hex Head Cap Screws Socket Head Cap Screws
SAE Grade 2
ASTM A307
(No Mark)
Grade 5*
ASTM A449 Grade 8* ASTM A354 Grade 8 **
* Manufacturer’s marks may vary
** For Flat and Button Head Socket Cap Screws, use Grade 5 minimum recommended torque values.
Size
(Inches)
Grade 2
Recommended Torque*** Grade 5 Recommended Torque*** Grade 8 Recommended Torque***
lb-ft
Min. Max. NCm
Min. Max. lb-ft Min. Max. NCm Min. Max. lb-ft Min. Max. NCm Min. Max.
1/4 5 6 6.8 8.1 9 11 12.2 14.9 12 15 16.3 20.3
5/16 10 12 13.6 16.3 17 21 23.1 28.5 24 29 32.5 39.3
3/8 20 23 27 31 35 42 48 57 45 54 61 73
7/16 30 35 41 47 54 64 73 87 70 85 95 115
1/2 45 52 61 70 80 96 108 130 110 125 149 170
9/16 65 75 88 102 110 125 149 170 160 175 217 237
5/8 95 105 129 142 150 175 203 237 220 245 298 332
3/4 150 185 203 251 270 300 366 407 380 425 515 576
7/8 160 200 217 271 400 450 542 610 600 660 814 895
1 250 300 339 406 580 680 786 922 900 990 1220 1342
1-1/8 800 175 1085 1193 1280 1440 1736 1953
1-1/4 1120 1240 1519 1681 1820 2000 2468 2712
1-3/8 1460 1635 1980 2217 2380 2720 3227 3688
1-1/2 1940 2180 2631 2956 3160 3560 4285 4827
*** Use minimum recommended torque value when threads are coated with a lubricant, such as engine oil,
or fasteners with phosphate and oil coatings. Use maximum recommended torque value for dry fasteners
or zinc plated fasteners without any lubricant.
Notes: 1. This specification is intended to be a general guideline for coarse threaded hardware in ferrous
materials (steel, cast-iron).
2. Thread engagements in non-ferrous materials (aluminum, brass, plastic, etc.) may not be
adequate to allow torque specified above.
3. Where a particular application gives specific torque values, use them in lieu of those given
above. Table i-2 -Wheel Lug Nut Torque Specifications
Steering Axle Drive Axle
1/2"-20 Thread 70-90 lb-ft (95-122 NCm) 5/8"-18 Thread 175-225 lb-ft (238-306 NCm)
9/16"-18 Thread 110-140 lb-ft (150-190 NCm) 3/4"-16 single cap nut 450-500 lb-ft (612-680 NCm)
5/8"-18 Thread 175-225 lb-ft (238-306 NCm) 3/4"-16 inner cap nut 450-500 lb-ft (612-680 NCm)
1-1/8"-16 outer cap nut 450-500 lb-ft (612-680 NCm)

Adjustments - Page 7-1
5000054 05/07
Adjustments
CABLE LENGTH
In order to account for differences in the length of certain tools it may be necessary to make adjustments to the
length of the cable.* Refer to Figure 7-1 and use the following procedure when adjusting the cable:
1. Move the auto-manual control valve handle forward to the manual/start position and set the parking brake.
2. Start the engine and raise the lead to the vertical position with the layback control. Move the lead all the
way to the right-hand side of the slide using the sideshift control.
3. Lower the tool to the ground or flat surface by pushing forward on the hammer control valve handle. Shut
the engine off.
4. Loosen the cable wedge at the hammer weight or at the base of the lift cylinder. (Refer to Figure 7-1)
5. Start the engine and use the hammer control valve handle to carefully extend the lift cylinder upward 10
inches (25 cm) above the bottom of the stroke. Shut the engine off.
6. Pull the slack out of the cable and resecure the wedge(s).
7. Restart the engine and use the hammer control valve handle to carefully extend the lift cylinder to its
maximum length. The weight should stop no closer than 6-10 inches (15 - 25 cm) from the stop blocks
located near the top of the lead. Readjust the cable, if necessary, to obtain the correct gap.
If the cable length is too short, or improperly set, it may be possible to adjust the lift height
so that the weight strikes the upper travel limit stop blocks on the lead. Striking the travel
limit stop blocks can cause severe structural damage to the machine. Make sure that the
lift height and cable length are properly set to prevent damage to the machine.
* When the Arrow hammer is shipped from the factory, the cable length has been set for use with a short tool
such as a breaker or a scoring tool. If a longer tool is to be used, it may be necessary to shorten the cable setting
as described above. On mechanically adjusted units, the automatic trip fingers will not be in the proper
position in relationship to hammer stroke unless cable length is properly adjusted. The cable length must be
set long enough to enable the hammer to strike a full blow before starting the up stroke. Too long a cable will
result in a time lag between strokes. Minor changes in cable length can be accounted for without making
physical changes to the cable setting by adjusting the mechanical up and down limit trips on mechanically
actuated units. Machine equipped with electronic stroke control are self-compensating for minor changes in
cable length.
REPLACING THE CABLE
Inspect the cable daily. If the cable is badly worn, bent, kinked, or has broken wires or strands, it must be
replaced. The Arrow Hammer is equipped with either a one-piece cable or a cable spool. A one-piece cable
will require replacement whenever the cable is broken, damaged, or frayed. The cable spool, which holds 250
ft. (76 m) of spare cable, permits replacement of the broken or damaged section only.
Cable Spool - Refer to the following instructions and Figure 7-1.
NOTE: When carrying spare cable, Do not cut the cable between the cable spool and the lift cylinder. Cable
fraying usually starts near the end of the cable closest to the weight. Leaving the cable intact makes it possible
to feed only as much cable as needed to replace the damaged section. Using this procedure, insures the most
efficient use of the cable on the cable spool.

Page 7-2 - Adjustments
5000054 8/96
Figure 7-1
CABLE THREADING

Adjustments - Page 7-3
5000054 05/98
REPLACING THE CABLE - Cable Spool cont'd.
1. Lock the hammer weight (See Figure 5-3) and lay the lead back into the stowed transport position. Shut
the engine off and set the parking brake.
NOTE: If the cable has broken during operation, it will not be possible to raise and lock the hammer weight.
DO NOT attempt to lay the lead back with the hammer weight on the ground. Retract the lift cylinder
completely and temporarily re-attach the broken cable end to the hammer weight. Lift and lock the hammer
weight in place before proceeding.
2. Remove both cable wedges and the cable clamp. Remove the broken or damaged section of cable.
3. Loosen the cable spool nut and rethread the cable as needed (refer to Figure 7-1). Make sure the cable
is threaded inside the two retaining loops on the attachment bracket.
4. Thread the cable back through the hammer weight. Reinstall the cable wedge and cable clamp.
NOTE: When replacing a section of damaged cable, pull the cable through the hammer weight until the
damaged section is clear of the cable wedge when reinstalled. Cut and discard the damaged section.
5. Follow the procedure for adjusting the CABLE LENGTH to complete the installation. Be sure to retighten
the spool nut before resuming operation.
Short Cable - 51' (15.5 m) Minimum - Refer to the following instructions and Figure 7-1.
1. Lock the hammer weight (See Figure 5-3) and lay the lead back into the stowed transport position. Shut
the engine off and set the parking brake.
NOTE: If the cable has broken during operation, it will not be possible to raise and lock the hammer weight.
DO NOT attempt to lay the lead back with the hammer weight on the ground. Retract the lift cylinder
completely and temporarily re-attach the broken cable end to the hammer weight. Lift and lock the hammer
weight in place before proceeding.
2. Remove both cable wedges (Refer to Figure 7-1).
3. Remove the broken or damaged cable. Be sure to remove and retain the cable clamp.
4. Insert the end of the new cable at the base of the lift cylinder and reinstall the cable wedge (Refer to Figure
7-1).
5. Thread the cable through the sheaves in the lift cylinder as shown in Figure 7-1. Make sure that the cable
is threaded inside the two retaining loops on the attachment bracket (Refer to Figure 7-1).
6. Run the cable through the sheave at the top of the lead and back down to the weight.
7. Reinstall the cable wedge and the cable clamp at the hammer weight.
8. Follow the procedure for adjusting the CABLE LENGTH to complete the installation.
Refer to the "Specifications" section for proper cable specifications. Minimum length for the cable is 51 ft.
(15.5 m). Replacement part numbers: 4001024 - 51 ft. (15.5 m), 2000616 - 250 ft. (76 m)

Page 7-4 - Adjustments
5000054 05/07
Figure 7-2
CARRIAGE & CENTER PIN ADJUSTMENTS
5000054 05/07

Adjustments - Page 7-5
5000054 05/07
CROSS-SLIDE BEARING ADJUSTMENT
The carriage assembly is equipped with plastic slider bearings which operate in contact with the surfaces of
the sideshift ways. It will occasionally be necessary to adjust these bearings for wear. (Refer to Figure 7-2)
1. Using the layback control valve, raise the lead into a vertical position.
2. Using the sideshift control valve, move the carriage assembly to a position approximately 3 inches (8 cm)
from the extreme right hand end of its travel.
3. Loosen, but DO NOT REMOVE, the bolts that attach the lower bearing retainer to the carriage assembly.
(Refer to Figure 7-2)
Removal of the bottom guide will allow the lead and carriage assembly to tip off the
sideshift frame in any direction. Do not remove the bottom guide unless the top of
the lead has been properly secured such as to an overhead hoist or crane.
4. Loosen the jam nuts from the adjustment screws located at the bottom of the carriage assembly.
5. Turn the adjustment screws to obtain a running clearance of 0.005" to 0.020" (0.127 - 0.508 mm) at the
lower bearing. (Refer to Figure 7-2)
6. Retighten the jam nuts and the mounting bolts.
7. Clean the sideshift ways and apply fresh lubricant to the slide contact surfaces of the ways.
8. Check the sideshift mechanism for freedom of movement by shifting the mechanism from side to side.
9. Readjust to provide greater bearing clearance as required for freedom of movement.
CARRIAGE BEARING END PLAY
The center pivot bearing on the carriage assembly should be checked periodically for end play. To adjust the
end play, refer to Figure 7-2 and use the following procedure:
1. Lay the lead down onto the lead rest and shut the engine off.
2. Move the layback control valve lever both directions to relieve any cylinder pressure.
3. Using standard feeler gauges, check the end play between the thrust washer and the retaining ring at the
back of the carriage center pivot. (Refer to Figure 7-2)
4. The correct end play is 0.005" to 0.010" (0.127 - 0.254 mm).
5. Loosen the lock bolt on the retaining ring.
6. Turn the retaining ring clockwise to reduce the end play.
7. Retighten the lock bolt.

Page 7-6 - Adjustments
5000054 05/07
Figure 7-3
SIDESHIFT CHAIN ADJUSTMENT
SIDESHIFT CHAIN
To adjust the tension on the sideshift drive chain, refer to Figure 7-3 and the following procedures:
1. Using the layback control valve, raise the lead into an upright position.
2. Using the sideshift control valve, move the carriage until it is approximately 3 inches (8 cm) away
from the right hand travel limit.
3. Loosen the jam nuts on each of the two chain adjustment screws located at the rear of the carriage,
near the center pivot. (Refer to Figure 7-3)
4. Adjust both screws equally until the slack has been removed from the chain.
Do not over tighten the sideshift chain. Over tightening will lead to excess wear and
possible failure of he chain and chain drive components.
5. To check for proper chain tension, locate the approximate center of the chain span. Grasp two adjacent
strands of the chain between thumb and forefinger. It should be easy to deflect each chain approximately
1 inch (2.5 cm), but difficult to make the chains touch.
6. Retighten the nuts and the jam nuts on the chain tensioning screws.

Adjustments - Page 7-7
5000054 05/07
Figure 7-4
SHEAVE SENSOR ADJUSTMENT
PROXIMITY SENSOR - electronic stroke control option
The proximity sensor is located on the right hand side of the sheave housing at the top of the lead. To
adjust the proximity sensor, refer to Figure 7-4 and use the following procedure:
1. Lay the lead down onto the lead rest.
2. Remove the two bolts securing the sensor to the sheave housing.
3. Remove the sensor bracket (with the sensor attached).
4. Move the sheave until the hub contacts the side of the sheave housing which has the sensor mounting
hole.
NOTE: Excessive sheave side play can result in erratic operation of the unit, or damage to the sensor.
5. Measure the distance between the spoke on the sheave and the outer face of the sheave housing.
6. Subtract 1/8" (3.2 mm) from the dimension obtained in step 5. This dimension is dimension "A".
(Refer to Figure 7-4)
7. Adjust the distance from the sensor face to the bracket face to dimension "A".
8. Reinstall the sensor bracket and sensor to the sheave housing.

Page 8-1
5000054 05/07
Hydraulic Pressure Adjustment
The following procedures and sequences should be followed accurately when setting
pressures. Failure to do so will result in poor and short service life of hydraulic
components.
Always use an accurate pressure gauge for setting hydraulic pressures - never guess. Increasing pressures
above those recommended will not increase the productivity of the machine but will cause unnecessary strain
on machine components.
REQUIRED EQUIPMENT
One (1) 3000 psi gauge, graduations 50 psi or less, accurate to ± 20 psi.
NOTE: Before setting or adjusting hydraulic pressures, do the following:
1. Fill the reservoir with hydraulic fluid to the full mark on the dipstick, with the hammer lift cylinder down.
2. Warm the hydraulic system until the oil in the reservoir reaches a temperature of approximately 100EF.
The hydraulic system can be warmed by operating the hammer lift circuit over relief by attempting to lift
a locked weight or by raising the weight to maximum height and holding the hammer-valve control lever
back, in the "UP" position. DO NOT operate the valve in relief longer than 15 seconds at a time without
a cool down period of similar length to prevent damage to the relief valve.
3. DO NOT attempt to adjust relief pressures if the reservoir temperature is exceedingly warm
(approximately 150EF).
4. Check the relief pressures with the engine operating at fast-idle speed (2200 rpm no load). Full-load speed
should be 2000-2100 rpm.
HAMMER LIFT CIRCUIT
1. Remove the 1/2" hex head pipe plug (gauge plug) from the base of the lift cylinder. Refer to Figure 8-1.
2. Install the 3000 psi gauge.
3. Start the engine. Set governed speed to 2200 rpm no load (2000-2100 rpm full load).
4. Warm the hydraulic-system oil to approximately 100EF.
5. With the weight locked into position, pull back slowly on the hammer valve-control lever and hold it in
the "UP" position. Pressure should read 1400-1450 psi.
6. To change the relief pressure, remove the plug from the relief-valve port on the hammer valve (refer to
Figure 8-1). Add or remove shims (Arrow part no. 3001344) between the spring and cap nut. Each shim
will change the pressure approximately 40 psi.
NOTE: If adding shims does not increase circuit pressure, check for one or more of the following conditions:
!worn pump
!drive line key missing
!incorrect hydraulic fluid
!oil temperature too high
!hammer valve not actuated to full stroke
!defective or worn relief valve and/or seat in the
hammer valve
!leaking hammer lift cylinder (leak may be
internal)
!engine not maintaining governed speed
The engine in proper operating condition will easily turn the pump at the required pressure setting and rpm.
(Service the engine to correct any difficulty.)

Page 8-2 - Hydraulic Pressure Adjustment
5000054 05/07
Figure 8-1
Hydraulic Lift Circuit
CONTROL CIRCUIT MAIN RELIEF
1. Remove the pipe plug from the tee fitting at the creeper control valve. Install a 3000 psi gauge in the tee.
(reference point "A" in Figure 8-2).
2. Actuate the sideshift control lever forward until the carriage reaches the end of its travel.
3. Actuate the tilt-control lever forward until the lead are tilted to the extreme travel of the cylinder.

Hydraulic Pressure Adjustment - Page 8-3
5000054 05/09
Figure 8-2
Hydraulic Control Circuit
4. Adjust the engine speed hand-control lever to provide maximum fast-idle rpm.
5. Actuate both valve-control levers forward (sideshift and tilt) at the same time.
6. With both valves actuated forward, the gauge attached at point "A" (Figure 8-2) should read 1500 psi.
7. The main-relief valve for the control circuits is located at the left side of the hydraulic pump at the rear
of the machine (see Figure 8-2).

Page 8-4 - Hydraulic Pressure Adjustment
5000054 09/12
Control Circuit Main Relief cont'd.
8. To adjust the relief pressure, remove the acorn nut and loosen the lock nut. Turn the slotted screw
clockwise to increase pressure. 1/4 turn of the screw will change the pressure approximately 50 psi.
Failure to push forward on sideshift and tilt-control levers at the same time when checking
the pressure will cause an incorrect setting of the relief pressure (most likely too high),
providing no protection for the pump, pump drive, and creeper-control circuit.
9. If relief pressure does not increase when adjusted according to step 10, check for the following conditions:
!improper hydraulic fluid
!broken relief-valve spring
!dirty or damaged relief valve
!worn pump
!oil too hot (above 150EF)
SIDESHIFT CONTROL-VALVE RELIEF
1. Check and set the main relief (at the pump) prior to adjusting the sideshift valve relief. Refer to the
previous section - "CONTROL CIRCUIT MAIN RELIEF".
2. The sideshift relief valve is located in the body of the sideshift-control valve, beside the control spool (see
Figure 8-2).
3. Set the engine to operate at maximum fast-idle rpm with the hand throttle.
4. Push the sideshift control-valve handle forward until the carriage reaches the end of its travel. Gauge
pressure at point "A" (see Figure 8-2) should read 1100 psi.
5. If the pressure is incorrect, loosen the jam nut on the sideshift relief valve. The jam nut can be accessed
from below, through the slot in the cowl. Insert a screwdriver through the hole at the rear of the cowl (near
the valve-control handle) and turn the screw clockwise to increase the pressure.
6. If adjusting the screw fails to correct the pressure, check for the following:
!broken relief-valve spring
!dirty or damaged relief valve
!sideshift valve not at full-stroke position
TILT AND LAYBACK CONTROL-VALVE RELIEF
1. Check and set the main relief (at the pump) prior to adjusting the tilt and layback control-circuit relief.
Refer to the section titled "CONTROL CIRCUIT MAIN RELIEF".
2. The relief valve is located in the tilt and layback control-valve body, beside the layback-control spool (see
Figure 8-2).
3. Set the engine to operate at maximum fast-idle rpm with the hand throttle.
4. Push the tilt control-valve handle forward until the lead are tilted to the extreme travel of the cylinder.
Gauge pressure at point "A" (see Figure 8-2) should read 1100 psi.
5. If the pressure is incorrect, loosen the jam nut on the relief valve. The jam nut can be accessed from
below, through the slot in the cowl (near the valve-control handle). Turn the screw clockwise to increase
the pressure.
6. If adjusting the screw fails to correct the pressure, check for the following:
!broken relief-valve spring
!dirty or damaged relief valve
!tilt valve not at full-stroke position

Hydraulic Pressure Adjustment - Page 8-5
5000054 05/07
PILOT-CIRCUIT RELIEF (electronic stroke control)
1. Check and set the main relief (at the pump) prior to adjusting the pilot-circuit (auto-manual) relief. Refer
to the section titled "CONTROL CIRCUIT MAIN RELIEF".
2. Remove the plug and install a 3000 psi gauge in the tee fitting at the creeper control valve (refer to point
"A" in Figure 8-2).
3. Lock the weight using the lock pin on the side of the lead mast.
4. Turn the on-off switch on the electronic control station to the "off" position.
5. Pull back slowly on the hammer-valve control lever to raise the weight against the pin. Release the control
lever.
6. Set the engine to operate at maximum fast-idle rpm with the hand throttle.
7. Pull the auto-manual valve-control lever back into "auto" (automatic) mode. The machine will attempt to
raise the weight.
8. Set the relief valve on the auto-manual control valve by using the same procedure outlined for the other
relief valves. The correct pressure is 400 psi.
Thehammer-valvecontrol leverwill beactuated automaticallyintothe "UP"position. Once
actuated, the hammer valve will become "stuck" in the "UP"position as long as pressure
remains in the pilot circuit. The pilot circuit does not bleed down instantly after the auto-
manual valve is returned to the neutral position. The hammer valve can be manually
overridden with considerable difficulty. Be prepared to shut the engine down if a problem arises.
PILOT-CIRCUIT RELIEF (mechanical stroke control)
1. Check and set the main relief (at the pump) prior to adjusting the pilot-circuit (auto-manual) relief. Refer
to the section titled "CONTROL CIRCUIT MAIN RELIEF".
2. Remove the plug and install a 3000 psi gauge in the tee fitting at the creeper control valve (reference point
"A" in Figure 8-2).
3. Lower the weight to the ground to set the trip lever on the rotary valve (located on the side of the hammer
cylinder) into the "down" position.
4. Raise and lock the weight using the lock pin on the side of the lead mast.
5. Pull back slowly on the hammer-valve control lever to raise the weight against the pin.
6. Set the engine to operate at maximum fast-idle speed.
7. Pull back on the hammer-valve control lever and hold the valve in the "UP" position. The machine will
attempt to raise the weight.
8. Pull the auto-manual valve-control lever back into "auto" (automatic) mode.
Once actuated, the hammer valve will become "stuck" in the "UP" position as long as
pressure remains in the pilot circuit. The pilot circuit does not bleed down instantly after
the auto-manual valve is returned to the neutral position. The hammer valve can be
manually overridden with considerable difficulty. Be prepared to shut the engine down if
a problem arises.

Page 8-6 - Hydraulic Pressure Adjustment
5000054 05/07
Pilot-Circuit Relief (mechanical stroke control) cont'd.
9. Set the relief valve on the auto-manual control valve by using the same procedure outlined for the other
relief valves. The correct pressure is 550 - 600 psi at point ‘A’; 350 - 400 psi at point B. (Refer to Figure
8-2.)
10. If adjusting the screw fails to correct the pressure, check for the following:
!broken relief-valve spring
!dirty or damaged ball or seat
!auto-manual valve not at full-stroke position
VALVE SPOOL CENTERING ADJUSTMENT
If valve-spool travel is uneven in either direction, or if the valve spools do not return normally to the neutral
(center) position, check to make sure the screw at the rear end of the spool is tight. These parts are illustrated
in the parts catalog. The screw is reached by removing the stop disc and the snap ring.

Hydraulic Pressure Adjustment - Page 8-7
5000054 05/09
Figure 8-3
Hydraulic Control Circuit (S/N 7050-)

Page 8-8 - Hydraulic Pressure Adjustment
5000054 05/09
CONTROL CIRCUIT MAIN RELIEF (S/N 7050-)
ArrowHammersaboveserialnumber7049haveaslightlydifferentcontrolvalveconfigurationthantheearlier
machines. They are distinctive in that there are no control valves to the left of the steering wheel and one three
spool valve and the auto-manual valve to the right. This system requires a different pressure setting sequence
andtheadditionalsetting ofthecreepercontrolvalvewhichnow hasanadjustablerelief. Removetheleftside,
top, and front cowling sections for easier access to the gauge ports and adjustments.
1. Remove the pipe plug from the teefitting at then creeper control valve. Install a 2000psi gauge in the tee.
(Reference point “A” in Figure 8-3).
2. Actuate the sideshift control forward until the carriage reaches the end of its travel.
3. Lock the weight using the lock pin on the side of the lead.
4. Turn the on-off switch on the electronic control station to the "off" position.
5. Pull back slowly on the hammer-valve control lever to raise the weight against the lock pin. Release the
control lever.
6. To set the main relief, the auto-manual valve must be first be turned up to 1000 psi. This can be read at
the point “A” gauge.
7. Set the engine to operate at maximum rpm with the hand throttle.
8. Pull the auto-manual valve-control lever back into "auto" (automatic) mode. The machine will attempt to
raise the weight.
9. Adjust the engine speed hand-control lever to provide maximum rpm.
10. Actuate both valve-control levers (sideshift forward and auto-manual valve back) at the same time.
11. With both valves actuated, the gauge attached at point "A" (Figure 8-3) should read 1500 psi.
12. The main-relief valve for the control circuits is located at the left side of the hydraulic pump at the rear
of the machine (see Figure 8-3).
13. To adjust the relief pressure, remove the acorn nut and loosen the lock nut. Turn the slotted screw
clockwise to increase pressure. 1/4 turn of the screw will change the pressure approximately 50 psi.
14. Ifreliefpressuredoes notincreasewhenadjustedaccording tostep12,checkfor thefollowingconditions:
Failure to activate the sideshift and auto/manual control levers at the same time when
checking the pressure will cause an incorrect setting of the relief pressure (most likely too
high), providing no protection for the pump, pump drive, and creeper-control circuit.
!Improper Hydraulic Fluid
!Broken Relief-valve Spring
!Dirty or Damaged Relief Valve
!Worn Pump
!Oil Too Hot (Above 150Ef)
15. The auto-manual valve must now be set to 400 psi. This is detailed in the Pilot Circuit Relief section that
follows.

Hydraulic Pressure Adjustment - Page 8-9
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SIDESHIFT CONTROL-VALVE RELIEF (S/N 7050-)
1. Check and set the main relief (at the pump) prior to adjusting the sideshift valve relief. Refer to the
previous section - "CONTROL CIRCUIT MAIN RELIEF".
2. The sideshift relief valve is located in the body of the three-spool control valve, beside the left control
spool (see Figure 8-3).
3. Set the engine to operate at maximum rpm with the hand throttle.
4. Push the sideshift control-valve handle forward until the carriage reaches the end of its travel. Gauge
pressure at point "A" (see Figure 8-3) should read 1100 psi.
5. If the pressure is incorrect, loosen the jam nut on the sideshift relief valve. The jam nut can be accessed
from below, through the slot in the cowl. Insert a screwdriver through the hole at the rear of the cowl
(near the valve-control handle) and turn the screw clockwise to increase the pressure.
6. If adjusting the screw fails to correct the pressure, check for the following:
!Broken Relief-valve Spring
!Dirty or Damaged Relief Valve
!Sideshift Valve Not at Full-stroke Position
PILOT-CIRCUIT RELIEF (S/N 7050-)
1. Check and set the main relief (at the pump) prior to adjusting the pilot-circuit (auto-manual) relief. Refer
to the section titled "CONTROL CIRCUIT MAIN RELIEF".
2. Remove the plug and install a 1000 psi gauge in the tee fitting at the auto-manual control valve (refer to
point "B" in Figure 8-3).
3. Lock the weight using the lock pin on the side of the lead.
4. Turn the on-off switch on the electronic control station to the "off" position.
5. Pullbackslowly onthehammer-valvecontrol levertoraisetheweightagainst thepin. Releasethe control
lever.
6. Set the engine to operate at maximum rpm with the hand throttle.
7. Pull the auto-manual valve-control lever back into "auto" (automatic) mode. The machine will attempt to
raise the weight.
8. Set the relief valve on the auto-manual control valve by using the same procedure outlined for the slide
relief valve. The correct pressure is 400 psi.
Thehammer-valve controlleverwill beactuated automaticallyintothe "UP"position. Once
actuated, the hammer valve will become "stuck" in the "UP"position as long as pressure
remains in the pilot circuit. The pilot circuit does not bleed down instantly after the auto-
manual valve is returned to the neutral position. The hammer valve can be manually
overridden with considerable difficulty. Be prepared to shut the engine down if a problem arises.