This manual provides information on the
installation, operation and repair of the IMT Model
DA435HA Hydraulic Air Compressor.
Three means are used throughout this manual to gain
the attention of operating and service personnel.
They are NOTES, CAUTIONS and WARNINGS
and are defined as follows:
NOTE
A NOTE IS USED TO EITHER CONVEY ADDITIONAL
INFORMATION OR TO PROVIDE FURTHER EMPHASIS
FOR A PREVIOUS POINT.
CAUTION
A CAUTION IS USED WHEN THERE IS THE STRONG
POSSIBILITY OF DAMAGE TO THE EQUIPMENT OR
PREMA TURE EQUIPMENT FAILURE.
WARNING
A W ARNING IS USED WHEN THERE IS THE POTENTIAL
FOR PERSONAL INJURY OR DEATH.
Operate this equipment with respect and service it
regularly for a safer working environment and
longer equipment life.
1-2. ORDERING INFORMATION
When placing orders or requesting assistance, refer
to the information below:
1-3. GENERAL INFORMATION
The IMT DA435HA air compressor is a single
stage, air cooled, 4-cylinder, pressure lubricated,
hydraulically driven unit, with a delivery rate of
35 CFM at 100 PSI.
CAUTION
OPERATING THE COMPRESSOR AT PRESSURES
ABOVE 150 PSI WILL SHORTEN THE SERVICE LIFE
AND VOID THE WARRANTY.
1-4.SPECIFICATIONS
Power SourceHydraulic Motor
Bore2-5/8"
Stroke2-1/2"
Cylinder Configuration V4
Dimensions26-1/2"L x 19-1/8"H* x 19-3/4"W
Displacement44 CFM**
Delivery35 CFM**
CoolingAir
Fan Diameter14-1/8"
Operating Speed1400 RPM maximum
LubricationOil Pump
Oil Capacity1-1/3 qts
Weight200 lbs.
Reservoir requirement 12 Gallon minimum
Normal GPM @1400rpm 9.3 GPM
Normal Operating PSI1850 PSI
Maximum PSI2400 PSI
* Add 2-5/8” to height for air filter cap.
** @ 1400 RPM - 100 PSI
TRANSMISSION MAKE:
PTO NUMBER:
COMPRESSOR MODEL:
PUMP MAKE:
RESERVOIR CAPACITY:
TO BE COMPLETED BY DEALER
CHASSIS INFORMA TION
MODEL:
PTO %:
COMPRESSOR AND HYDRAULIC PUMP INFORMATION
SERIAL NUMBER:
MODEL:
ENGINE RPM:
Page 6
DA435HA: 99901219:1-219980930
NOTES
Page 7
DA435HA: 99901219:2-1
19980930
SECTION 2. INSTALLATION
2-1. GENERAL
This section pertains to the installation of the IMT
DA435HA compressor, PTO and pump. The
instructions are intended as a guide to assist you
with your particular installation. These instructions
will provide only general information.
2-2. PTO AND PUMP INSTALLATION
The pump may either be installed directly on the
PTO (see Figure B-1) or, as an optional method, it
may be driven by a driveline (see Figure B-2).
2-2-1. PTO INSTALLATION
Power take-off manufacturers provide specific
installation instructions for their products. Those
instructions should be followed when installing a
PTO. Check with the PTO manufacturers
representative for specific instructions regarding
your particular make, model and year of vehicle.
The following instructions are a guide in this
application.
1. If the vehicle is new, drain the transmission oil
into a clean container for reuse. If the vehicle is
used, drain and dispose of the transmission oil
properly.
2. Temporarily install the PTO with the proper
gaskets and only two studs. Snug the PTO down
and check the backlash for maximum allowance of
.006" to .012". If the backlash is excessive, remove
gaskets and check backlash again until it is
corrected.
3. Remove the PTO and apply Permatex® to the
gaskets. If the holes for the studs are tapped through
the transmission housing, apply Permatex to the
studs and tighten them down. Make certain that the
studs do not interfere with the transmission gears.
CAUTION
AVOID CONTACT OF PERMATEX WITH
TRANSMISSION FLUID.
Registered Trademark of Permatex Co., Inc., Kansas City, Kansas
4. Install the PTO and gaskets. Torque the nuts to
30 - 35 ft-lbs (4.14 - 4.84 kg-m) for a 6-bolt PTO
and 45 - 50 ft-lbs (6.22 - 6.91 kg-m) for 8-bolt
PTOs. Recheck the backlash.
5. Install the shifter cable to suit conditions.
Always allow for a slight overshift on lever or knob
to ensure the PTO is fully disengaged.
CAUTION
IT IS IMPORTANT THAT ADEQUATE SPACE BE
ALLOWED FOR FULL ENGAGEMENT OF THE PTO.
MODIFY THE EXHAUST OR OTHER OBSTRUCTIONS
AS NEEDED.
FIGURE B-1. PTO INSTALLATION
CAUTION
AVOID SHARP BENDS IN THE SHIFTER CABLE. ALL
BENDS SHOULD HAVE AT LEAST A 6" RADIUS.
TIGHTER BENDS WILL CAUSE DIFFICUL T OPERA TION
OF THE SHIFTER KNOB.
6. Replace the transmission oil. If the PTO is
located below the transmission oil level, an
additional quantity of oil will be required.
7. Start the engine, engage the PTO and check for
proper PTO rotation. Allow it to run for 5 - 10
minutes. Check for leaks, unusual noise and proper
operation.
8. Retorque the mounting bolts.
Page 8
DA435HA: 99901219:2-2
19980930
2-2-2. DRIVELINE AND PUMP
INSTALLATION
The pump may be driven as shown in Figure B-2 as
an optional method to the one shown in Figure B-1.
The following steps are a guide in this application.
NOTE
BEFORE INSTALLING DRIVELINE, REFER TO
PARAGRAPH 2-4 FOR PROPER DRIVELINE
INST ALLATION TECHNIQUES.
1. Install the PTO (refer to Paragraph 2-2-1).
2. Loosely bolt the pump mounting bracket (A) to
the adjustable bracket (B) in Figure B-2.
3. Bolt the adjustable bracket to the frame at a
point that will not exceed 48" (122cm) from the
PTO and will not cause a joint angle greater than 3°.
4. Check the pump rotation and install pump, pump
end yoke and PTO end yoke.
WARNING
THE INSTALLER OF THE DRIVELINE MUST INSPECT
THE FINAL POSITION OF THE DRIVELINE TO
DETERMINE WHETHER ITS LOCATION PROVIDES
SUFFICIENT PROTECTION TO AN OPERATOR, OR
OTHER PERSONNEL, FROM HAZARDS ASSOCIATED
WITH A ROTATING DRIVELINE. IF PROTECTION IS
INSUFFICIENT, THE INSTALLATION OF A GUARD IS
REQUIRED. IF YOU ARE UNSURE OF METHODS TO
GUARD A ROTATING DRIVELINE, CALL IOWA MOLD
TOOLING CO., INC. FOR INSTRUCTIONS. FAILURE
TO DO SO MAY RESULT IN SERIOUS INJURY OR
DEATH.
5. Size, cut and weld the driveline to the necessary
length. Ensure driveline balance and run out meet
specification. Allow 1" (2.54cm) extra for PTO end
yoke.
6. Install driveline in phase with proper operating
angle calculations, lock set screws and grease Ujoints and mating spline.
7. Ensure all mounting bolts are tight.
2-3. COMPRESSOR INSTALLATION
See Installation Kit Drawing in the Parts Section for
specific installation and parts information.
FIGURE B-2. DRIVELINE & PUMP INSTALLATION
Page 9
DA435HA: 99901219:2-319980930
2-4. DRIVELINE INSTALLATION
TECHNIQUES
2-4-1. U-JOINT OPERATING ANGLES
Every U-joint that operates at an angle creates
vibration.
U-joint operating angles are probably the most
common cause for driveline vibration in vehicles
that have been reworked or that have had auxiliary
equipment installed.
When reworking a chassis or installing a new
driveshaft in a vehicle, make sure that you follow
the basic rules that apply to u-joint operating angles,
as follows:
1. U-joint operating angles at each end of a shaft should
always be at least 1°.
2. U-joint operating angles on each end of a driveshaft
should always be equal within 1° of each other.
2-4-2. SINGLE PLANE AND COMPOUND
U-JOINT OPERATING ANGLES
There are two types of u-joint operating angles,
single plane and compound.
SINGLE PLANE
Single plane angles occur when the transmission and
pump components are in line when viewed from
either the top or side, but not both.
Determine the u-joint operating angle in an
application where the components are in line when
viewed from the top, but not in line when viewed
from the side, is as simple as measuring the slope of
the components in the side view, and adding or
subtracting those slopes to determine the angle. See
figure.
3. U-joint operating angles should not be larger than 3°. If
more than 3°, make sure they do not exceed the
maximum recommended angles for the RPM at which
they will be operating.
A u-joint operating angle is the angle that occurs at each
end of a driveshaft when the output shaft of the
transmission and the input shaft of the pump are not in
line. See figure.
The connecting driveshaft operates with an angle at
each u-joint. It is that angle that creates a vibration.
REDUCING AND CANCELING VIBRATION
A key point to remember about u-joint operating
angles: To reduce the amount of vibration, the
angles on each end of a driveshaft should always be
SMALL.
To cancel an angle vibration, the u-joint operating
angles need to be EQUAL within 1° at each end of a
shaft. See figure.
These angles should be SMALL and equal within 1°.
Determine the u-joint operating angles on a shaft
that is straight when viewed from the side and offset
when viewed from the top requires the use of a
special chart (See accompanying chart). In this type
of application, the centerlines of the connected
components must be parallel when viewed from the
top, as shown. These angles should also be SMALL
and equal within 1°. See figure.
Look at the angle chart and note that the smaller the
offset, the smaller the resultant angle.
To reduce the possibility of vibration, keep any
offset between connected points to a minimum.
Page 10
DA435HA: 99901219:2-419980930
There are two things which can be done to make
certain single plane angles are SMALL and
EQUAL:
Make sure that the transmission and pump are mounted
so that their centerlines are parallel when viewed from
both the side and the top.
Make sure the offset between them is mall in both views.
COMPOUND ANGLES
Compound u-joint operating angles occur when the
transmission and pump are not in line when viewed
from both, the top and side. Their centerlines,
however, are parallel in both views. See figure.
Do the same for the other end of the shaft. Compare
the resultant calculated u-joint operating angle for
each end. They should be EQUAL within 1°. If they
are not, the driveshaft will vibrate.
Compound u-joint operating angles are one of the
most common causes for driveline vibration. To
avoid thease problems, remember these important
considerations:
When setting up an application that requires compound ujoint operating angles, always keep the centerlines of the
transmission and pump parallel in both views.
Always keep the offset between their horizontal and
vertical centerlines small.
TRUE U-JOINT OPERATING ANGLE
The true u-joint operating angle, which must be
calculated for each end of the shaft with compound
angles, is a combination of the u-joint operating
angle in the top view, as determined from the chart,
and the measured u-joint operating angle in the side
view.
To determine the true u-joint operating angle for one
end of a shaft, (compound angle C° in the formula
shown in figure below) insert the u-joint operating
angle measurement obtained in the side view and the
u-joint operating angle obtained from the chart into
the formula.
NOTE
CENTERLINES OF TRANSMISSION AND AXLE MUST
BE PARALLEL IN BOTH TOP AND SIDE VIEWS TO USE
THIS METHOD OF DETERMINING TRUE U-JOINT
OPERATING ANGLE. CONTACT IMT TECHNICAL
SUPPORT IF YOU HAVE AN APPLICATION WHICH
CANNOT BE INSTALLED WITH THEIR CENTERLINES
PARALLEL.
Page 11
DA435HA: 99901219:2-519980930
2-4-4. ANGLE SIZE
The magnitude of a vibration created by a u-joint
operating angle is proportional to the size of the ujoint operating angle. IMT recommends true u-joint
operating angles of 3° or less.
Obtain the true u-joint operating angle, as explained
above, and if it is greater than 3°, compare it to the
following chart.
The angles shown on the chart are the MAXIMUM
u-joint operating angles recommended by IMT and
are directly related to the speed of the driveshaft.
Any u-joint operating angle greater than 3° will
lower u-joint life and may cause vibration.
Remember to check maximum safe driveshaft RPM
as recommended by the driveshaft manufacturer.
Each compressor is bench tested under load at the
factory to ensure proper break-in and operation.
While it is not necessary to follow any break-in
procedure, the following checks should be made
before putting the unit into service, as well as,
periodically during use.
1. Before start-up:
A. Check the oil level in the compressor
crankcase with the dipstick on the unit. If oil is
needed, use only IMTs synthetic compressor
oil. Always check compressor oil level with the
truck and compressor on level ground.
B. Check the air intake filter to make certain
that it is clean and unobstructed. A dirty filter is
a possible cause of reduced air output.
C. Avoid operating the compressor package
when the side-to-side or front-to-rear tilt is
greater than 20°.
2. With the compressor engaged:
Adjust engine speed to ensure that compressor
speed does not exceed 1400 RPM (max) under
load. Crack open air discharge valve until air
pressure drops to 140 PSI and maintains this
pressure without cycling. Doing so simulates a
maximum load condition.
3-2. OPERATION
To use the compressor, start the vehicle engine and
engage the compressor by operating the compressor
switch.
The system will now function automatically. It will
engage the hydraulic solenoid when the air pressure
is below 120 psi, and disengage when the air
pressure reaches 150 psi.
CAUTION
OPERATING THIS UNIT IN EXCESS OF 1400 RPM,
WILL VOID THE WARRANTY , AND WILL SHORTEN THE
NORMAL SERVICE LIFE OF THE COMPRESSOR.
If engine speed increase is required, readjust air
discharge valve to 140 PSI after speed has been
increased. Repeat until appropriate compressor
RPM (NOT engine) is acheived.
Checking compressor RPM can be done using a
phototach on the drive coupling through the air
cleaner access hole. A hydraulic flow meter can
be used, but is nat as accurate.
Page 14
DA435HA: 99901219:3-219980930
NOTES
Page 15
DA435HA:4-199901219: 19980930
Section 4. MAINTENANCE & PARTS
4-1. GENERAL
The following table provides list of routine
maintenance items, including service intervals. The
remainder of Section 4 includes a part lists and
assembly drawings of the compressor.
SERVICE INTERVALS
MAINTENANCE OPERATION
INSPECT DRIVE COUPLING FOR WEAR
AIR CLEANER - CHANGE
AIR INTAKE - INSPECT
CRANKCASE OIL LEVEL - CHECK, ADD IF NEEDED
CRANKCASE OIL - CHANGE (SEE NOTE 1)
CHECK CYLINDER HEAD STUD TORQUE (SEE NOTE 2)
COOLING VANES (FINS) - CLEAN
SAFETY VALVES - CHECK OPERATION
SAFETY VALVES - CLEAN
AIR RECEIVER - DRAIN CONDENSATION
RECEIVER SAFETY VALVES - CHECK OPERATION
TIGHTEN AND CHECK ALL VAL VES
CHECK ALL ELECTRICAL CONNECTIONS
CHECK FITTINGS AND AIR LINES FOR LEAKS
INSPECT CHECK VAL VES FOR PROPER OPERATION
DAILYWEEKLY250/3500/6
INSPECT CHECK VALVES FOR CARBON BUILDUP
Service intervals are listed as hours/months, whichever occurs first.
Use only IMT’s synthetic compressor oil. The use of any other oil causes excessive carbon buildup, and will void the
warranty on the compressor.
NOTE 1.
Under normal operating conditions, oil changes are required every 3 months. When operating in a dirty environment,
change the oil and air filter more frequently as your particular operating conditions dictate. Oil capacity is 1-1/3 quarts.
NOTE 2.
Cylinder head stud torque MUST be checked after the initial 8-10 hours of operation. The compressor must be cold (room
temperature) before retorquing of studs. Torque studs to 240 in-lbs plus or minus 10 in-lbs.
H1301437CANOPY 1
H2977004-062 WASHER 1/4X.062X5/820
H3 983904-075 BOL T, ST A R DRIVE 1/4-20 x 3/420
H4 961504-090 NUT 1/4-20 TINNERMAN14
H5301436PANEL-END RECIP 1
H6301435PANEL-END COOLER 1
H7301381HARNESS-35 RECIP 1
H8301581HARNESS-TOWER 3-WAY 1
H9 301607HARNESS-SHROUD 3-WAY 1
H10 98404-071WASHER, FLA T WIDE 1/4” SS20
Page 22
DA435HA:4-8
WIRING.01: 19990209
COMPRESSOR WIRING DIAGRAM
FAN
POWER RELAY
HIGH TEMPERATURE
SHUTDOWN
SWITCH RELAY
HYDRAULIC VALVE BLOCK ASM
W/ N.O. SOLENOID AND
RELIEF VALVES
COOLING
FAN ASM
M10033
HIGH TEMPERAT URE
SHUTDOWN SWITCH
SHUTDOWN RELAY
SOCKET
FAN RELAY
SOCKET
CIRCUIT
BREAKER
FURNAS
SWITCH
FURNAS
PRESSURE
SWITCH
SHUTDOWN
SWITCH
HYDRAULIC
SOLENOID
VALVE
FAN
BATTERY 12VDC
IGNITION 12VDC
PTO GROUND SIGNAL
CUSTOMER
CONNECTIONS
SYSTEM GROUND
SPEED CONTROL
COMPRESSOR ON
Page 23
DA435HA:4-9
MOUNTING.01: 20050630
DA435HA MOUNTING LOCATIONS
(99903712)
DA435HA INSTALLATION ON SERIES 1 AND SERIES 2
DOMINATOR
4.40
13.38
12.7512.00
DA435HA INSTALLATION ON SERIES 2
DOMINATOR WITH HEADACHE RACK
AND STANDARD HEIGHT SIDEPACK ON
COMPRESSOR SIDE
4.40
13.38
0.44 TYP. (4)
0.44 TYP. (4)
12.0018.75
Page 24
DA435HA:4-10
51712642.01: 20010925
INSTALLATION KIT (51712642)
(THROUGH 3-15-05)
(INSTALLATION DWG 99901281 SHOWN)
ITEM PART NO.DESCRIPTIONQTY
1. 76391527BUMPER-RUBBER 4
2. 938206107 WASHER 3/8 FLA T GR8 (938206107) 4
3. 929106200 BOLT 3/8-16X2 HHGR5 4
4. 99901281DRAWING 1
1 TYP (4)
2 TYP (4)
3 TYP (4)
Page 25
DA435HA:4-1151712642.01: REV. B 20050630
INSTALLATION KIT (51712642)
(EFFECTIVE 3-15-05)
(INSTALLATION DWG 99901281 SHOWN)
ITEM PART NO.DESCRIPTIONQTY
1. 76391527BUMPER-RUBBER 4
2. 929106200 BOLT 3/8-16X2 HHGR5 4
3. 938206107 WASHER 3/8 FLA T GR8 4
Page 26
DA435HA:4-12
20050629
COMPRESSOR HARNESS CHART
Effective March 15, 2005, the connectors in the harnesses used on the DA435HA were upgraded. The old and new
connectors are not interchangeable, so for replacement parts, the correct harness and/or jumper must be ordered.
Use the following chart to determine the correct harness and/or jumper.
If your DA435HA connector looks like Connector A:
and your body connector looks like this:No jumper is needed.
and your body connector looks like this:Use jumper # 77441160.
If you are not using an IMT body and your connector looks like Connector A, use jumpers 301581 and 301607.
Page 27
DA435HA:4-13
20050630
COMPRESSOR HARNESS CHART, CONTINUED
If your DA435HA connector looks like Connector B:
and your body connector looks like this:Use jumper # 77441158.
and your body connector looks like this:No jumper is needed.
If you are not using an IMT body and your connector looks like Connector B, use jumper 77441157.
Page 28
DA435HA:4-14
E
304710: 20050629
HARNESS (304710) EFFECTIVE 3/15/05
LOCKING
#8 SPAD
4B
ORANGE 4A
FORKS
12
14 YELLOW
48
YELLOW
28
BLACK
14 YELLOW
SWITCH
11
3 YELLOW
2-WAY WP TOWER CONNECTOR
2 FEMALE TERMINALS
2 GRAY CABLE SEALS
BUTT
BUTT
9B BLACK
10 BLACK
14 RED
1
14 RED
8
4A
14 GA WIRE
9A
1
7
2C
14 BLACK
5
14 RED
MP 2 WAY MALE
SHUTDOWN SWITCH
TERMINAL, CABLE SEAL,
#10 RINGS
2A
WIRE TIE
CONNECTOR
FAN MOTOR
FEM TERMINAL AMP
PIN "F" IS
14 BLACK
ORANGE
YELLOW
DK GREEN
14 RED
TO LOOM
NOT USED
8-PIN CONNECTOR
YELLOW
3
20
BLACK
SHUTDOWN
SWITCH
87a
87
30
86
85
RELAY SOCKET
(LOAD VIEW)
BC
10 BLACK
YELLOW
7 DK GREEN
B
88
14 RED
6
14 RED
87
85
30
FAN POWER
CIRCUIT BREAKER
90
DK. BLUE
87a
RELAY SOCKET
(LOAD VIEW)
2 POSITION SPAL BODY SFL
ALL WIRE IS 16 GA GPT. EXCEPT 14 GA AS SHOWN.
Page 29
DA435HA:4-15
DECALS.01: 20030715
DECAL PLACEMENT (80015)
ITEM PART NO.DESCRIPTIONQTY
I171393715DECAL-DIAMOND AIR 2
I270395091DECAL-DA435HA COMPRESSOR 2
I3300913DECAL-OIL DRAIN 1
I4*300040DECAL-DANGER BREATHING AIR 1
I5*300042DECAL-WARNING CONNECT AIR 1
I6*300041DECAL-WARNING FAN GUARD 1
I7*301442DECAL-DRIVE COUPLING 1
I8301634DECAL COMBO 1
I9301480SERIAL PLATE 1
I10 302265DECAL - AIR 1
I11 302266DECAL - HYD. TANK 1
I12 302267DECAL - HYD. PRESSURE 1
THE INSTALLER OF THE DRIVELINE MUST INSPECT
THE FINAL POSITION OF THE DRIVELINE TO
DETERMINE WHETHER ITS LOCATION PROVIDES
SUFFICIENT PROTECTION TO AN OPERATOR, OR
OTHER PERSONNEL, FROM HAZARDS ASSOCIATED
WITH A ROTATING DRIVELINE. IF PROTECTION IS
INSUFFICIENT, THE INSTALLATION OF A GUARD IS
REQUIRED. IF YOU ARE UNSURE OF METHODS TO
GUARD A ROTATING DRIVELINE, CALL IOWA MOLD
TOOLING CO., INC. FOR INSTRUCTIONS. FAILURE
TO DO SO MAY RESULT IN SERIOUS INJURY OR
DEATH.
1751709743FIL TER ASM 100-MESH1PN/A
773052091HYD FILTER 25/MIC-1 ¼ FPT1PN/A
Page 33
DA435HA: 99901219:5-1
19980930
SECTION 5. REPAIR
5-1. GENERAL
This section describes the disassembly and assembly
procedures for the air compressor. In all cases,
remove the compressor from the vehicle before
proceeding with disassembly and repair within a
clean environment. Refer to the parts drawing in
section 4 of this manual for parts locations.
5-2. PISTON RING REPLACEMENT
1. Remove the pulsation tank.
2. Unscrew the head bolts and remove the heads.
NOTE
A RUBBER FACED MALLET WILL HELP WHEN
REMOVING THE HEAD. T AP THE SIDES OF THE HEAD
CAREFULLY UNTIL THE HEAD IS LOOSE. LIFT OFF
THE HEADS.
3. Remove the cylinder bolts. Tap the sides of the
cylinder several times to break it loose from the
gasket. Rock the cylinder back and forth and lift
until it is free. Lift it off the pistons.
8. With the ring expander, install the new ring kit.
Make certain that the oil ring is on the bottom and
the beveled inside edge of the compression ring is
toward the top of the piston.
9. Position the cylinder base gasket on the
crankcase. Use a few drops of oil to hold it in
position. Install the cylinder block spacer and gasket
on the crankcase.
10. Rotate the rings so that the gaps of the three
rings are 120° apart. Lightly lubricate the inside of
the cylinder. Rotate the crankshaft so that a piston is
at the top of the stroke. Compress the rings with a
ring compressor, and slide the cylinder over the
piston. Repeat for the other piston.
CAUTION
DO NOT LUBRICATE THE RINGS. USE A LIGHT
LUBRICANT, SUCH AS WD-40 ONLY, ON THE
CYLINDER WALLS. OILING THE RINGS WILL
PREVENT THEM FROM SEATING AND CAUSE
EXCESSIVE OIL CONSUMPTION.
4. Use a single edged razor blade, or sharp
putty knife, to remove the old gasket material.
CAUTION
DO NOT ALLOW THE GASKET MA TERIAL T O FALL INTO
THE CRANKCASE. DO NOT NICK THE HEAD,
CYLINDER, OR CRANKCASE MATING FACES WHILE
REMOVING THE OLD GASKET. REMOVE ALL OF THE
OLD GASKET MATERIAL TO PROVIDE A SMOOTH,
CLEAN SURFACE FOR THE NEW GASKET. FAILURE
TO FOLLOW THIS PROCEDURE MAY RESULT IN THE
NEED TO RESEAL THE UNIT LATER.
5. Hone the cylinder to break the glaze and to
remove the buildup at the top of the cylinders.
6. Measure the inside diameter of the cylinder for
roundness and excessive wear. The bore should be
2.625" (0.0025" tolerance). If the bore is oversized,
the cylinder must be replaced.
7. With a ring expander, remove the compression
and oil rings.
FIGURE E-1. PISTON RING
ORIENTATION
FIGURE E-2. CYLINDER HEAD TORQUE
SEQUENCE
Page 34
DA435HA: 99901219:5-219980930
11. Slide the cylinder down until it mates with the
crankcase. Start all cylinder mounting bolts, until
they are snug. Torque the bolts to 180 in-lbs in the
sequence shown. Do not torque to the full 180 in-lbs
all at once, but in 25-50 in-lb increments.
12. Position the gaskets and valve plate on top of the
cylinder. Position the head on the cylinder and turn
studs finger tight. Torque the studs/nuts to 240 in-lbs
in 25-50 pound increments per Figure E-2.
NOTE
INSTALL THE VALVE PLATE WITH THE MARKED
SURFACE FACING UP.
7. Insert the two remaining bolts and torque to 180
in-lbs. The bolts should be torqued in a diagonal
pattern.
8. Install the air compressor in the vehicle.
Connect the air lines and wiring.
5-4. CRANKSHAFT AND BEARING
REPLACEMENT
If it is necessary to replace the crankshaft, related
components must also be replaced. Replace both
bearings, both races, the key, pump collar and pump
drive pin.
13. Install the pulsation tank, and torque to 180 inlbs.
14. Install the compressor, connect the wiring and
the air lines. Test the unit.
NOTE
IF PRESSURE FAILS TO BUILD AND THE
COMPRESSOR IS EXCESSIVEL Y NOISY, CHECK THE
V ALVE PLA TE. IT MA Y HA VE BEEN INST ALLED UPSIDE
DOWN.
5-3. OIL PUMP REPLACEMENT
1. Remove the bolts and lift off the pump
cover.
2. With a single edged razor blade, or sharp putty
knife, remove the old gasket material. Take care not
to damage the machined surfaces.
3. Lift the pump out of the cavity.
4. Position a new gasket on the rear bearing
housing.
NOTE
DEPENDING ON THE CONDITION OF THE
CRANKSHAFT, BEARING MAY BE REPLACED
WITHOUT REPLACING THE CRANKSHAFT . REPLACE
THE BEARING RACES WHENEVER THE BEARINGS
ARE REPLACED.
1. Remove the pulsation tank, both heads,
cylinders, and pistons.
2. Remove the bolts on the connecting rods, and
lift them out. Reassemble the connecting rods to be
certain that the matched parts remain together on the
same crankshaft journals.
3. Remove the pump cover, oil pump, sleeve,
spring, and rear bearing housing.
4. Remove the hydraulic motor hub (#301266), and
the front bearing housing.
5. Pull the crankshaft from the crankcase.
6. Remove all gasket material with a single edged
razor blade, or sharp putty knife.
5. Insert the pump into the cavity. Position the
pump slightly to one side, using a common
screwdriver. Wedge the pump into position so that it
partially compresses the spring. Note that the driver
pin and slot in pump must be in line.
6. Place the pump cover into position and start two
bolts (bolts must be diagonally opposed). Strike the
pump cover with a rubber faced mallet to jar the
pump loose. When the tension spring can be felt
against the pump cover, the pump is loose.
CAUTION
DO NOT GOUGE THE MACHINED SURFACES WHEN
REMOVING THE GASKETS. THIS MA Y CAUSE LEAKS.
7. Press the bearing races out of the bearing
housing.
8. Press the tapered roller bearings off of the
crankshaft if only the bearings are being replaced. If
the crankshaft is to be replaced, discard the entire
assembly.
9. Press the new bearings into position.
Page 35
DA435HA: 99901219:5-3
THE CRANKSHAFT SHOULD HAVE NEW BEARINGS
INSTALLED. IF NOT, PRESS THE NEW BEARINGS
INTO POSITION ON THE CRANKSHAFT.
19980930
NOTE
10. Generously oil the front bearing race and install
the front bearing housing with gasket. Torque the
bolts to 180 in-lbs. Torque the bolts as shown in the
pattern below.
FIGURE E-3. BEARING HOUSING
TORQUE SEQUENCE
NOTE
GASKET KITS ARE SUPPLIED WITH TWO (2) EACH OF
.006, .010, .015, AND .020 GASKETS. USE THESE
REAR BEARING GASKETS IN ANY COMBINA TION AND
QUANTITY TO LIMIT ALL PLAY FRONT TO REAR, BUT
STILL ALLOW THE CRANKSHAFT TO TURN FREELY.
12. Install the oil pump (See paragraph 5-3).
13. Install the connecting rods. Thoroughly oil the
crankshaft and rods before installing them. When
installing the rods, make certain that the tabs are
aligned on the same side of the rod as shown below.
11. Slide the crankshaft into the crankcase.
Generously lubricate the bearing race and install the
rear bearing housing and gaskets.
FIGURE E-4. ROD ALIGNMENT
14. Install the pistons, rings, heads and pulsation
tank.
Page 36
DA435HA: 99901219:5-4
19980930
5-5. TROUBLESHOOTING
LOW OIL PRESSURE
NO OIL PRESSURE
COMPRESSOR WILL NOT ENGAGE
COMPRESSOR ENGAGES BUT WILL NOT
PRESSURIZE TANK
COMPRESSOR DOES NOT RECOVER PRESSURE
AS FAST AS IT SHOULD
LOW OIL LEVEL
LOOSE PIPE PLUG ON OIL PUMP COVER
WORN OR DEFECTIVE OIL PUMP
CRACK OR SCRATCH ON OIL PUMP COVER
DEFECTIVE OIL PUMP
BLOCKED OIL PASSAGE
DAMAGED OIL PUMP DRIVE PIN
NO POWER SUPPLIED TO COMPRESSOR
INTERNAL CIRCUIT BREAKER TRIPPED
PTO SWITCH NOT ENGAGED
DEFECTIVE PRESSURE SWITCH OR UNDERHOOD SWITCH
COMPRESSOR RELIEF V ALVE ENGAGED
AIR LEAK IN PLUMBING
WORN PISTON RINGS OR VALVE PLATES
DEFECTIVE CHECK VALVE / VALVES
DIRTY FILTER
AIR LEAK IN PLUMBING
WORN VALVE PLATES OR PISTON RINGS
FIGURE E-5. TROUBLESHOOTING CHART
Page 37
DA435HA: 99901219:6-919980930
Page 38
DA435HA: 99901219:6-1020020328
This parts manual is provided to the user to assist in servicing the equipment. It is the propertyof Iowa Mold Tooling Co., Inc and, as such,
may not be reproduced either whole or in part,whether by chemical, electrostatic, mechanical or photographic means without the
expressedwritten permission of an officer of Iowa Mold Tooling Co., Inc. One manual is provided with each piece of new equipment and
additional manuals may be obtained at a nominal price.
IOWA MOLD TOOLING CO., INC.
BOX 189, GARNER, IA 50438-0189
TEL: 641-923-3711
TECHNICAL SUPPORT FAX: 641-923-2424
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