Graco SaniForce SDU Series Parts list manual

3A0591ZAG
EN
Instructions/Parts
SaniForce®Ram
Packages
For use in sanitary applications to transfer medium to high viscosity fluids. For
professional use only.
Not approved for use in European explosive atmosphere locations.
See Technical Specifications on page 27 for model information, including maximum fluid working pressure.
ti15713a
Important Safety Instructions
Read all warnings and instructions in this
manual. Save these instructions.

2 3A0591ZAG
Contents
Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Configuration Matrix . . . . . . . . . . . . . . . . . . . . . . . . 6
Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Pressure Relief Procedure. . . . . . . . . . . . . . . . . 13
Flush Before First Use . . . . . . . . . . . . . . . . . . . . 13
Setting Inflatable Seal Pressure. . . . . . . . . . . . . 13
Starting and Adjusting the Ram . . . . . . . . . . . . . 14
Starting and Adjusting the Pump . . . . . . . . . . . . 15
Changing Drums . . . . . . . . . . . . . . . . . . . . . . . . 16
Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Cleaning Procedure . . . . . . . . . . . . . . . . . . . . . . 17
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Repair. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Disconnect Piston Pump . . . . . . . . . . . . . . . . . . 19
Service Ram Pistons . . . . . . . . . . . . . . . . . . . . . 20
Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Piston Pump Ram Packages . . . . . . . . . . . . . . . 22
Air Controls Kits . . . . . . . . . . . . . . . . . . . . . . . . . 27
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Technical Specifications . . . . . . . . . . . . . . . . . . . . 30
Model Weights . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Related Manuals
Manual in
English Description
3A5798 SaniForce 5:1 Pump, Instructions/Parts
3A5564 SaniForce 6:1 Pump, Parts
3A5799 SaniForce 12:1 Pump, Instructions/Parts
3A5800 SaniForce Air Control, Instructions/Parts

Warnings
3A0591ZAG 3
Warnings
The following warnings are for the setup, use, grounding, maintenance, and repair of this equipment. The
exclamation point symbol alerts you to a general warning and the hazard symbols refer to procedure-specific risks.
When these symbols appear in the body of this manual, refer back to these Warnings. Product-specific hazard
symbols and warnings not covered in this section may appear throughout the body of this manual where applicable.
WARNING
+
SKIN INJECTION HAZARD
High-pressure fluid from dispensing device, hose leaks, or ruptured components will pierce skin. This
may look like just a cut, but it is a serious injury that can result in amputation. Get immediate surgical
treatment.
•Do not point dispensing device at anyone or at any part of the body.
•Do not put your hand over the fluid outlet.
•Do not stop or deflect leaks with your hand, body, glove, or rag.
•Follow the Pressure Relief Procedure when you stop dispensing and before cleaning, checking, or servicing
equipment.
•Tighten all fluid connections before operating the equipment.
•Check hoses and couplings daily. Replace worn or damaged parts immediately.
MOVING PARTS HAZARD
Moving parts can pinch, cut or amputate fingers and other body parts.
• Keep clear of moving parts.
• Do not operate equipment with protective guards or covers removed.
• Pressurized equipment can start without warning. Before checking, moving, or servicing equipment,
follow the Pressure Relief Procedure and disconnect all power sources.

Warnings
4 3A0591ZAG
FIRE AND EXPLOSION HAZARD
Flammable fumes, such as solvent and paint fumes, in work area can ignite or explode. To help
prevent fire and explosion:
• Use equipment only in well ventilated area.
• Eliminate all ignition sources; such as pilot lights, cigarettes, portable electric lamps, and plastic drop
cloths (potential static arc).
• Keep work area free of debris, including solvent, rags and gasoline.
• Do not plug or unplug power cords, or turn power or light switches on or off when flammable fumes
are present.
• Ground all equipment in the work area. See Grounding instructions.
• Use only grounded hoses.
• Hold gun firmly to side of grounded pail when triggering into pail.
• If there is static sparking or you feel a shock, stop operation immediately. Do not use equipment
until you identify and correct the problem.
• Keep a working fire extinguisher in the work area.
EQUIPMENT MISUSE HAZARD
Misuse can cause death or serious injury.
• Do not operate the unit when fatigued or under the influence of drugs or alcohol.
• Do not exceed the maximum working pressure or temperature rating of the lowest rated system
component. See Technical Data in all equipment manuals.
• Use fluids and solvents that are compatible with equipment wetted parts. See Technical Data in all
equipment manuals. Read fluid and solvent manufacturer’s warnings. For complete information
about your material, request MSDS from distributor or retailer.
• Do not leave the work area while equipment is energized or under pressure. Turn off all equipment
and follow the Pressure Relief Procedure when equipment is not in use.
• Check equipment daily. Repair or replace worn or damaged parts immediately with genuine
manufacturer’s replacement parts only.
• Do not alter or modify equipment.
• Use equipment only for its intended purpose. Call your distributor for information.
• Route hoses and cables away from traffic areas, sharp edges, moving parts, and hot surfaces.
• Do not kink or over bend hoses or use hoses to pull equipment.
• Keep children and animals away from work area.
• Comply with all applicable safety regulations.
SPLATTER HAZARD
Hot or toxic fluid can cause serious injury if splashed in the eyes or on skin. During blow off of platen,
splatter may occur.
• Use minimum air pressure when removing platen from drum.
TOXIC FLUID OR FUMES HAZARD
Toxic fluids or fumes can cause serious injury or death if splashed in the eyes or on skin, inhaled, or
swallowed.
• Read MSDSs to know the specific hazards of the fluids you are using.
• Route exhaust away from work area. If diaphragm ruptures, fluid may be exhausted into the air.
• Store hazardous fluid in approved containers, and dispose of it according to applicable guidelines.
WARNING

Warnings
3A0591ZAG 5
BURN HAZARD
Equipment surfaces and fluid that’s heated can become very hot during operation. To avoid severe
burns:
• Do not touch hot fluid or equipment.
PERSONAL PROTECTIVE EQUIPMENT
You must wear appropriate protective equipment when operating, servicing, or when in the operating
area of the equipment to help protect you from serious injury, including eye injury, hearing loss,
inhalation of toxic fumes, and burns. This equipment includes but is not limited to:
• Protective eyewear, and hearing protection.
• Respirators, protective clothing, and gloves as recommended by the fluid and solvent manufacturer.
WARNING

Configuration Matrix
6 3A0591ZAG
Configuration Matrix
Check the identification plate (ID) for the Configuration Number of your pump. Use the following matrix to define the
components of your system.
Sample Configuration Number: SDU B01AAA6AA0C21
Some combinations are not possible. Please check with your local supplier.
SDU B 01 A A A 6 AA 0 C21
Sanitary
Drum
Unloader
Frame Pump Platen Seal
Style
Seal
Material
Controls Accessories Wash Bin Certification
Sanitary
Drum
Unloader
Frame Pump Platen Seal Style
SDU BCarbon Steel 01 5:1 Double Ball A20” Conical,
inflatable
AInflatable
02 5:1 Priming Piston B21.25” Conical, static BStatic
03 6:1 Double Ball
04 6:1 Priming Piston
05 12:1 Priming Piston
Seal Material Controls Accessories Wash Bin Certification
APolychloroprene 6Exposed pneumatic, carbon
steel, inflatable
AA None 0None C21 EN 10204
type 2.1
BEPDM 7Exposed pneumatic, carbon
steel, static
Approvals
All models are rated:
and are FDA compliant.
ATEX models with piston pumps are rated:
II 2 GD
Ex h IIA T4 GB X
Ex h IIIB T100°C Db X

Installation
3A0591ZAG 7
Installation
Grounding
Pump: Connect a ground wire (Graco PN 238909) to
the ground screw on the bottom cover of the air motor,
under the shield. Connect the other end of the ground
wire to a true earth ground.
Air and fluid hoses: use only electrically conductive
hoses with a maximum of 500 ft. (150 m) combined
hose length to ensure grounding continuity. Check
electrical resistance of hoses. If total resistance to
ground exceeds 25 megohms, replace hose
immediately.
Air compressors: follow manufacturer’s
recommendations.
Dispense valve: ground through connection to a
properly grounded fluid hose and pump.
Material supply container: follow local code.
Container(s) that receive material: follow local code.
Solvent pails used when flushing: follow local code.
Use only conductive metal pails, placed on a grounded
surface. Do not place the pail on a nonconductive
surface, such as paper or cardboard, which interrupts
grounding continuity.
To maintain grounding continuity when flushing or
relieving pressure: hold metal part of the dispense
valve firmly to the side of a grounded metal pail, then
trigger the valve.
Location
Position the ram so the air controls are easily
accessible. Ensure that there is sufficient overhead
clearance when the ram is fully raised. See Repair,
page 18.
Position the ram in an area with adequate access for
servicing and cleaning the equipment and adjacent
areas to maintain the required level of hygiene. Locate
equipment away from sources of air currents, dust, or
liquids derived from leakage, condensation, or aerosols.
Using the holes in the ram base as a guide, drill holes
for 1/2 in. (13 mm) anchors.
Check that the ram base is level in all directions. If
necessary, level the base using metal shims. Secure the
base to the floor using 1/2 in. (13 mm) anchors that are
long enough to prevent the ram from tipping.
The equipment must be grounded. Grounding
reduces the risk of static and electric shock by
providing an escape wire for the electrical current due
to static build up or in the event of a short circuit.

Installation
8 3A0591ZAG
Setup
Reference numbers and letters in parentheses in the
text refer to the callouts in the figures and the parts
drawings.
Accessories are available from Graco. Make certain all
accessories are sized and pressure-rated to meet your
system requirements
FIG. 1 is a guide for selecting and installing system
components and accessories. Contact your Graco
distributor for assistance in designing a system to suit
your particular needs.
•Inflatable Seal (C): Adjust inflation level so the seal
fits snug against the drum. A properly inflated seal
wipes the sides of the drum and prevents material
from passing the plate, to minimize waste.
•Main air bleed valve (D): Required in your system
to shut off the air supply to the pump and ram.
When closed, the valve bleeds off all air in the ram
and pump.
Air and Fluid Accessories
The following accessories are recommended for your
system, and are available from your Graco distributor.
Make certain all accessories are sized and
pressure-rated to meet your system requirements
•Fluid Drain Valve (M): Required in your system to
relieve fluid pressure between the pump and the
dispense device.
•Fluid Outlet Elbow (P): Recommended for ram
packages with piston pumps. Connects the fluid
outlet hose to the pump fluid outlet.
•Air Line Filter (K): Removes harmful dirt and
moisture from the compressed air supply.
•Second bleed-type air valve (L): isolates air line
accessories and supply system for servicing. Locate
upstream from all other air line accessories.

Installation
3A0591ZAG 9
FIG. 1: Typical Installation, Piston Pump
TI16245
A
B
H
K
C
D
J
M
E
F
G
L
Key:
Ram Package Components (Supplied)
A Pump
B Ram
C Inflatable Seal
D Main Air Bleed Valve (required for pump and ram)
E Air Assist Air Supply
F Inflatable Seal Air Supply (partially visible)
G Ram Director Control
H Air Controls (see FIG. 2)
Accessories (Not Supplied)
J Air Supply Hose (use 1/2 in. air hose, minimum)
K Air Line Filter
L Second Bleed-Type Air Valve
M Fluid Outlet Hose
N Fluid Drain Valve (required for pump)
P Fluid Outlet Elbow
N
P

Installation
10 3A0591ZAG
FIG. 2: Exposed Air Control Module
Exposed Air Control Module
(Rear View)
Main Air Inlet
(on bottom)
Air Assist Air Supply
(out of view)
Ram Up Air Supply
Exposed Air Control Module
(Front View)
BD
BE
BF
BK
BB
BC
BJ
Pump Air Supply
BG (out of view)
BL
BK
BA
Ram Down Air Supply
BH

Installation
3A0591ZAG 11
Integrated Air Controls
See FIG. 2. Air inlet size is 3/4 npt(f) on the Exposed Air
Controls. The integrated air controls include:
•Main air valve (BA): turns air on and off to the
system. When closed, the valve relieves pressure
downstream.
•Ram air regulator (BB): controls ram up and down
pressure.
•Ram director switch/valve (BC): controls ram
direction.
•Exhaust port with muffler (BD)
•Air motor regulator (BE): Controls air pressure to
motor.
•Air motor switch/slider valve (BF): turns air on
and off to the air motor. When closed, the valve
relieves air trapped between it and the air motor.
•Air assist valve (BG): turns air on and off to push
the ram plate out of an empty drum. Uses line air.
•Inflatable seal air regulator (BH): controls air
pressure to the inflatable seal.
•Inflatable seal switch (BJ): controls the inflation
and deflation of the ram plate seal.
•Air relief valve (BK): automatically relieves
excessive pressure.
•Seal bleed off valve (BL): bleeds air from inflatable
seal as needed for drum tapering. For Exposed Air
Control Modules, See FIG. 2.

Operation
12 3A0591ZAG
Operation
Pressure Relief Procedure
Do not close the main air valve until Step 6. The
Enclosed Air Controls will not operate when the main air
supply is in the Off position.
1. Close the air motor slider valve (BF). See FIG. 2.
2. Back the ram director air regulator down to zero. Set
the ram director switch/valve (BC) to DOWN. The
ram will slowly drop.
3. Jog the director valve up and down to bleed air from
ram cylinders.
4. Turn the inflatable seal switch (BJ) to off.
5. Open the fluid ball valve and/or dispensing valve to
relieve fluid pressure.
6. Close the main air valve (BA).
Flush Before First Use
The sanitary pump was assembled using sanitary
lubricant on moving parts and was tested in water. Flush
the pump thoroughly with an appropriate cleaning
solution or disassemble and sanitize the parts before
using the pump. See your separate pump manual for
complete flushing and cleaning procedures for a
sanitary pump. Check national, state, and local codes
for specific limitations.
Setting Inflatable Seal Pressure
1. Set an empty drum on the ram base. Set the
director valve (BC) to DOWN. Lower the seal into
the drum to the point of the drum’s largest inside
diameter.
2. Set the inflatable seal switch (BJ) to On. Adjust the
seal air regulator until the seal just touches the
inside of the drum.
3. Leave regulator set at this setting for this style of
drum.
4. Set the inflatable seal switch to Off to deflate seal
before raising the ram. Set the director valve (BC) to
UP and let the ram rise to its full height.
5. Remove the empty drum.
NOTE: Use the lowest seal pressure possible to
achieve desired results. Excessive seal pressure may
cause the seal to roll off of the follower plate. To prevent
overpressurization, a relief valve limits seal pressure to
30 psi (2.1 bar, 0.21 MPa).
WARNING
Trapped air can cause the pump to cycle
unexpectedly, which could result in serious
injury from injection, splashing or moving
parts. Relieve pressure when you stop
pumping and before cleaning, checking, or
servicing equipment.

Operation
3A0591ZAG 13
Starting and Adjusting the Ram
1. Close all air regulators and air valves.
2. Turn on the main air supply.
3. Open the main air valve (BA), and set the ram
director air regulator (BB) to 2.8 bar, 0.26 MPa (40
psi). Set the director valve (BC) to UP and let the
ram rise to its full height.
4. Lubricate inflatable seal (C) with sanitary lubricant.
5. Set a full drum of fluid on the ram base, slide it back
against the tube stop, and center it under the
follower plate.
6. Remove the drum cover, and smooth the surface of
the fluid with a straightedge.
7. Secure the bag liner to the drum with tape or a
strap, to prevent it from sliding into the drum.
8. Set the director valve to DOWN. Set ram air
regulator at about 40 psi (0.28 MPa, 2.8 bar). Lower
the ram until the ram plate is about to enter the
drum, and set the valve to neutral. Reposition the
drum as necessary so the inflatable seal does not
hit the drum lip.
Exposed Controls: To increase or decrease the speed
of downward travel on the ram plate, adjust the director
valve (BC).
9. Set the director valve to DOWN, and continue to
lower the ram until the ram plate contacts the fluid.
10. Set seal air pressure regulator to pressure
determined in Setting Inflatable Seal Pressure,
page 12. Set the inflatable seal switch to On to
inflate seal.
NOTE: If fluid leaks past the seal, increase the air
pressure to the seal gradually until leaking stops. To
prevent overpressurization, a relief valve limits seal
pressure to 30 psi (2.1 bar, 0.21 MPa).
WARNING
• Do not inflate the seal when not
installed on the follower plate. Wear
safety glasses when operating the
seal. Seal burst could result in injury.
• Keep hands and fingers away from the
ram plate, pump fluid inlet, and lip of
the fluid container when raising or
lowering the ram to reduce risk of
serious injury from moving parts.
NOTICE
Do not use drums that have side bungs or large dents
with this ram. Rough bung openings or large dents will
damage the inflatable seal or stop the ram plate,
resulting in a runaway pump.

Operation
14 3A0591ZAG
Starting and Adjusting the Pump
See FIG. 3, page 14.
1. Be sure the pump air regulator (BE) is closed. Set
the ram air regulator (BB) to about 50 psi (0.35
MPa, 3.5 bar). Set the director valve (BC) to DOWN.
2. Start the pump as explained in the separate pump
instruction manual.
3. Keep the director valve (BC) set to DOWN while the
pump is operating.
Adjusting the Pressure
Different combinations of seal and ram pressure may be
necessary for proper seal and pump operation.
• If the pump does not prime properly with heavier
fluids, increase air pressure to the ram.
• If fluid is forced out around the inflatable seal,
decrease pressure to the ram.
• For diaphragm pump models, adjust DOWN
pressure to the minimum level, to ensure that the
pump inlet balls seat properly.
If seal pressure builds when the seal enters a tapered
portion of the drum, the relieve valve will activate. Turn
the seal bleed-off valve (BL) counterclockwise to open
it.
FIG. 3. Air Control Module
BL TI15715a
BC
BB
BE

Operation
3A0591ZAG 15
Changing Drums
1. Stop the pump. Close the air motor valve (BF).
2. Set the inflatable seal valve (BJ) to deflate.
3. Set the director valve (BC) to UP to raise the ram
plate.
4. Raise the ram plate until it is completely out of drum.
5. If needed, use air assist (BG) to help lift the ram
plate.
6. Remove the empty drum.
7. Inspect the ram plate and, if necessary, remove any
remaining material or buildup.
8. Place a full drum on ram base.
9. Lower the ram, and adjust the position of the drum
relative to the ram plate, as explained under Setting
Inflatable Seal Pressure on page 12.
Shutdown
1. Set the director valve (BC) to neutral.
2. Follow Pressure Relief Procedure, page 12.
3. Follow the pump shutdown instructions in your
separate pump manual.
Moving parts can pinch, cut, or amputate fingers and
other body parts. Keep your hands and fingers away
from the priming piston, ram plate, and lip of drum
during operation and whenever the pump or ram is
charged with air.
Excessive air pressure in the material drum could
cause the drum to rupture, causing serious injury
and equipment damage. The platen must be free to
move out of the drum.
• Never use drum blowoff air assist with a
damaged drum.
• Always deflate the seal prior to lifting ram plate or
engaging air assist.

Operation
16 3A0591ZAG
Cleaning Procedure
NOTE: The following instructions are a basic procedure
for cleaning a sanitary ram.
•Be sure to follow your national and state sanitary
standard codes and local regulations.
• Use appropriate cleaning and disinfecting agents, at
intervals appropriate for product processed.
• Follow cleaning product manufacturer’s instructions.
1. Remove the pump from the fluid container. Operate
it to pump out as much fluid as possible.
2. Flush the system thoroughly with an appropriate
cleaning solution.
3. Set the inflatable seal valve (BJ) to deflate.
4. Set the director valve (BC) to UP to raise the ram
plate.
5. If needed, use air assist (BG) to help lift the ram
plate.
6. Raise the ram plate until it is completely out of the
drum. Remove the empty drum.
7. Disconnect inflatable seal supply air.
8. Pull the inflatable seal down to remove. Clean and
sanitize the seal.
NOTE: Discoloration of the inflatable seal is normal.
Replace the inflatable seal if the surface is
compromised due to excessive wear, tears, cuts, or
gouges.
9. Set the director valve to DOWN. Lower the ram
plate.
10. Follow the Pressure Relief Procedure, page 12.
11. Disconnect all remaining air and fluid hoses, and
remove air inlet and exhaust fittings.
12. Remove and clean the pump.
NOTE: The pump must be disassembled to thoroughly
clean it. See your separate pump manual for complete
flushing and cleaning procedures for a sanitary pump.
Any damaged rubber parts must be replaced as they
could harbor microorganisms that can contaminate the
fluid.
13. Remove, clean, and sanitize the clamps (12, 13),
ram plate (5) and seal (8).
14. Remove the air motor cover. Open the control box
door. Wipe out any residual cleaning fluid or
moisture.
15. Clean external surfaces of all parts before
reassembly.

Troubleshooting
3A0591ZAG 17
Troubleshooting
1. Follow Pressure Relief Procedure, page 12. 2. Check all possible remedies in the Troubleshooting
Chart before disassembling the pump.
Problem Cause Solution
Ram will not raise or lower. Closed air valve or clogged air line. Open, clear.
Not enough ram air pressure. Increase.
Worn or damaged piston. Replace.
Hand valve closed or clogged. Open, clear.
Ram raises and lowers too fast. Air pressure is too high. Decrease.
Travel rate is not properly adjusted. Exposed Air Controls - open the
director valve less for slower travel,
more for faster travel.
Air leaks around cylinder rod. Worn rod seal. Replace.
Fluid squeezes past ram plate
wipers.
Ram air pressure too high. Decrease ram pressure.
Worn or damaged wipers. Replace.
Inflatable seal pressure too low. Increase seal pressure
Pump will not prime properly or
pumps air.
Closed air valve or clogged air line. Open, clear.
Not enough air pressure. Increase.
Worn or damaged piston. Replace. See pump manual.
Hand valve closed or clogged. Open, clear.
Hand valve is dirty, worn, or
damaged.
Clean, service.
Air assist valve will not hold drum
down or push plate up.
Closed air valve or clogged air line. Open, clear.
Not enough air pressure. Increase.
Valve passage clogged. Clean.
Seal pressure builds when drum
tapers, activating the automatic
pressure relief.
Seal bleed-off valve (BL) is closed Open. See Integrated Air Controls,
page 11.

Repair
18 3A0591ZAG
Repair
Disconnect Piston Pump
1. Follow Pressure Relief Procedure, page 12.
2. Disconnect inflatable seal supply air and air assist
supply air.
3. Remove two clamps (12) holding the tie rods (2) to
the ram plate. Remove gaskets (7).
4. Remove nut (4) and washer (3) holding the air
motor connecting rod (10) to the tie beam (114).
5. Open main air valve (BA). Set the director valve
(BC) to UP to raise the ram. Set the director valve to
neutral. Close main air valve (BA).
6. To remove the pump from the ram plate, remove
clamp (13) and gasket (8). Carefully lift the pump up
and away from the plate, using two people if
needed.
NOTE: See your piston pump manual and air motor manual
for cleaning, repair, and parts information.
FIG. 4. Remove piston pump
12
7
2
13
8
ti16470a

Repair
3A0591ZAG 19
Service Ram Pistons
Always service both cylinders at the same time. When
you service the piston rod always install new o-rings in
the piston rod seal and ram piston.
• Order Piston Repair Kit 24G853 for a stainless steel
ram. Parts are marked with a † in the illustrations
and parts list.
• Order Piston Repair Kit 24G854 for a carbon steel
ram. Parts are marked with an * in the illustrations
and parts list.
Disassemble Piston and Seal
124
123
120
121†
113
106*†
103
111*†
112*†
104*†
122†
115*†
105*†
TI16472a
102
1. Follow Pressure Relief Procedure, page 12.
2. Follow Disconnect Piston Pump, page 18.
3. Remove nuts (117) and lock washers (116) holding
the tie bar (114) to the piston rods (102). Also
remove nuts (4) and washers (3) holding the tie bar
to the tie rods (2).
4. Stainless Steel Rams: Remove four screws (124)
and washers (123), then remove the piston cap
(120). Remove outer o-ring (121) and inner o-ring
(122) from piston cap.
5. Remove retaining ring (115).
6. Carefully pull the piston rod out of the top of the
cylinder.
7. Slide the piston seal housing (103) and spring (104)
up off of the piston rod (102). Remove outer o-ring
(105) and inner o-ring (106) from the piston seal
housing (103).
8. Remove retaining ring (112) and bearing (111) from
the piston seal housing (103).
NOTICE
Do not tilt the piston rod when removing it from the
base or when installing it. Such movement can
damage the piston or the inside surface of the base
cylinder.
FIG. 5. Piston Rod Seal

107
108*†
109*†
110*†
105*†
TI10521a
102
Repair
20 3A0591ZAG
9. Carefully lay piston (107) and rod (102) down so rod
will not be bent. Remove nut (108), washer (109),
and piston (107). Remove outer o-ring (105) and
inner o-ring (110).
10. Inspect parts for wear or damage. Replace as
necessary.
Reassemble Piston and Seal
1. Install new o-rings (105 and 110) and lubricate
piston (107) and o-rings.
2. Apply medium strength thread sealant. Install piston
(107), washer (109), and nut (108) on piston rod
(102).
3. Carefully insert piston into cylinder and push piston
rod straight down into cylinder.
4. Lubricate o-ring (106) and bearing (111). Install
o-ring (106), bearing (111), and retaining ring (112)
into piston seal housing (103).
5. Install new o-ring (105) on piston seal housing
(103).
6. Carbon Steel Rams: Install new pin (113) if
necessary, or be sure it is in place.
7. Lubricate o-ring (105) and piston seal housing
(103).
8. Slide spring (104) and piston seal housing (103) on
the rod (102). Carbon Steel Rams: orient the pin to
the slot in the cylinder. Stainless Steel Rams: be
careful not to push the piston seal housing down
into cylinder.
9. Install retaining ring (115).
10. Stainless Steel Rams: Lubricate and install inner
o-ring (122) into piston cap (120). Install outer o-ring
(121) onto piston cap. Then install piston cap (120)
onto the cylinder with screws (124) and washers
(123).
11. Reattach the tie bar (114), washers (116, 3), and
nuts (117, 4).
FIG. 6. Ram Piston.