Parker ST Series High Flow Unvalved Hydraulic Quick Couplings Installation Guide

Port End Assembly Guide
Assembly/Installation

Port End Assembly

The three common types of port ends used in the United States with tube fittings, pipe fittings and hose fittings are:

1. Parallel thread
2. Tapered Thread
3. Flanges

Parallel Thread Ports

Unlike tapered threads, parallel thread ports do not require sealing by the threads. The seal is obtained by other means, typically an elastomeric seal. When assembled properly, parallel thread ports provide the best leak-free port connection available.
Parker tube fittings are available with several types of parallel thread port studs (ends):

• SAE straight threads (SAE J1926 / ISO 11926)
• ISO (ISO 6149)
• JIS (JIS B2351)
• BSPP flat face (ISO 1179)
• DIN Metric flat face (ISO 9974).

The SAE straight thread, ISO 6149 and JIS B2351 ports are all of similar design. The male end is fitted with an O-ring. On assembly, the O-ring is firmly sandwiched between the angular sealing surface of the female port, the male end undercut, and the shoulder or back-up washer of the male end. Sealing is thus made possible and maintained by the O-ring compression, as shown in Fig. R1. The straight threads do not offer sealing action; they provide the resistance (holding power) for service pressure. Port dimensions for SAE and ISO 6149 ports are given on pages S31 and S32 respectively. For JIS B2351 dimensions, please contact the Tube Fittings Division.

With the BSPP and metric flat face port ends, the sealing actually takes place on the top surface (spot face) of the port. Port dimensions can be found on pages S34 and S35 respectively.
There are several sealing methods available for these ports. Port studs with type “E” sealing utilize Parker’s EOlastic seal (ED) (see Fig. R2) and are recommended for higher pressures than the other types. Types “G” and “H” use an O-ring that is supported on the outside by a removable retaining ring (see Fig. R3). Type B (cutting face) is designed with a relatively sharp ridge of material that seals by coining the flat face of the female port (see Fig. R4). A fourth sealing method uses a bonded seal which consists of a metal ring with an elastomer bonded to the inside surface (often referred to as Dowty ® seal) (see Fig. R5).

For assembly purposes, there are two main categories of parallel port ends: adjustable and non-adjustable. Adjustable port ends are commonly found on shaped fittings to allow for proper orientation of the fitting. Besides the elastomeric seal, adjustable port ends are assembled with a locknut and a backup washer as shown in Fig. R6. Non-adjustable port ends are found on straight fittings.

The general assembly procedure for all adjustable parallel threadport ends is the same. Likewise, the assembly procedure is the same for all non-adjustable parallel thread port ends.

Adjustable Port End Assembly

1. Inspect components to ensure that male and female port threads and sealing surfaces are free of burrs, nicks and scratches, or any foreign material.
2. If O-ring or seal is not pre-installed to fitting male port end, install proper size O-ring or seal, taking care not to damage it.
3. Lubricate O-ring with light coat of system fluid or a compatible lubricant to help the O-ring slide smoothly into the port and avoid damage.
4. Back off lock nut as far as possible. Make sure backup washer is not loose Parker Robust Port Stud and is pushed up as far as possible.
5. Screw fitting into port until the back-up washer or the retaining ring contacts face of the port. Light wrenching may be necessary. Over tightening may damage washer. This potential damage is eliminated with Parker’s Robust Port Stud.
6. To align the tube end of the fitting to accept incoming tube or hose assembly, unscrew the fitting by the required amount, but not more than one full turn.
7. Using two wrenches, hold fitting in desired position and tighten locknut to the proper torque value from the appropriate table located on pages R5 – R6.
8. Inspect to ensure that O-ring is not pinched and that washer is seated flat on face of port.

Non-adjustable Port End Assembly

1. Inspect components to ensure that male and female port threads and sealing surfaces are free of burrs, nicks, and scratches, or any foreign material.
2. If O-ring or seal is not pre-installed to fitting male port end, install proper size O-ring or seal, taking care not to damage it.
3. Lubricate O-ring with light coating of system fluid or a compatible lubricant to help the O-ring slide past the port entrance corner and avoid damaging it.
4. Screw fitting into port and tighten to proper torque from the appropriate table located on pages R5 – R6.

SAE Straight Thread Port Assembly (SAE J1926)

SAE Dash Size| Thread Size UN/UNF|

Assembly Torque (+10% -0)

---|---|---
Non-Adjustables| Adjustables| Plugs
Seal-Lok (Heavy Duty SAE J1926-2)| Triple-Lok Ferulok Adapters (Light Duty SAE J1926-3)| Seal-Lok (Heavy Duty SAE J1926-2)| Triple-Lok Ferulok Adapters (Light Duty SAE J1926-3)| Hollow Hex| Hex Head
HP5ON-S (Light Duty SAE J1926-3)| P5ON-S (Light Duty SAE J1926-3)
ft.lbs. (in. lbs)| N-m| ft.lbs. (in.lbs)| N-m| ft.lbs. (in. lbs)| N-m| ft.lbs. (in. lbs)| N-m| ft.lbs. (in. lbs)| N-m| ft.lbs. (in. lbs)| N-m
2| 5/16-24| —| —| (85)| 10| —| —| (60)| 7| (60)| 7| (85)| 10
3| 3/8-24| —| —| (155)| 18| —| —| (100)| 11| (100)| 11| (155)| 18
4| 7/16-20| (310)| 35| (260)| 29| (180)| 20| (180)| 20| (180)| 20| (260)| 29
5| 1/2-20| (360)| 41| (280)| 32| (360)| 41| (250)| 28| (250)| 28| (280)| 32
6| 9/16-18| (420)| 47| (350)| 40| (420)| 47| (350)| 40| (350)| 40| (350)| 40
8| 3/4-16| (720)| 81| (620)| 70| (720)| 81| (620)| 70| (620)| 70| (620)| 70
10| 7/8-14| 100| 136| 85| 115| 100| 136| 85| 115| 85| 115| 85| 115
12| 1 1/16-12| 135| 183| 135| 183| 135| 183| 135| 183| 135| 183| 135| 183
14| 1 3/16-12| 175| 237| 175| 237| 175| 237| 175| 237| 175| 237| 175| 237
16| 1 5/16-12| 200| 271| 200| 271| 200| 271| 200| 271| 200| 271| 200| 271
20| 1 5/8-12| 250| 339| 250| 339| 250| 339| 250| 339| 250| 339| 250| 339
24| 1 7/8-12| 305| 414| 305| 414| 305| 414| 305| 414| 305| 414| 305| 414
32| 2 1/2-12| 375| 508| 375| 508| 375| 508| 375| 508| 375| 508| 375| 508

Table R1 – SAE J1926 Straight Thread Port Assembly Torques
Notes: Lubricate threads before assembly. Values in chart are for plated steel fittings in steel ports. For stainless steel fittings, use the upper limit of torque range. For brass and aluminum decrease torque value by 35%.
BSPP (Thread G) Port Assembly (ISO 1179 / DIN 3852-2)

Series| Tube O.D.| BSPP Thread G Size|

Assembly Torque Nm +10% -0

---|---|---|---
Straight Male Stud Fittings| Non-Return
Valves RHV / RHZ| Banjo Fittings| Plugs VSTI-ED| Straight and Adjustable Fittings
Form A for Sealing Washer| Form B with Cutting Face| Form E with ED- Sealing| Form E with ED- Sealing| WH / TH| SWVE| Form E with ED- Sealing| O-Ring with Retaining Ring and Bonded Washer
 | 6| 1/8 – 28| 9| 18| 18| 18| 18| 18| 13| 18
8| 1/4 – 19| 35| 35| 35| 35| 45| 40| 30| 35
10| 1/4 – 19| 35| 35| 35| 35| 45| 40| 30| 35
L| 12| 3/8 – 19| 45| 70| 70| 50| 70| 65| 60| 70
15| 1/2 – 14| 65| 140| 90| 85| 120| 90| 80| 90
18| 1/2 – 14| 65| 100| 90| 85| 120| 90| 80| 90
 | 22| 3/4 – 14| 90| 180| 180| 140| 230| 125| 140| 180
28| 1 – 11| 150| 330| 310| 190| 320| —| 200| 310
35| 1 1/4 – 11| 240| 540| 450| 360| 540| —| 400| 450
 | 42| 1 1/2 – 11| 290| 630| 540| 540| 700| —| 450| 540
 | 6| 1/4 – 19| 35| 55| 40| 45| 45| 40| —| 40
8| 1/4 – 19| 35| 55| 40| 45| 45| 40| —| 40
S| 10| 3/8 – 19| 45| 90| 80| 60| 70| 65| —| 60
12| 3/8 – 19| 45| 90| 80| 60| 70| 65| —| 60
14| 1/2 – 14| 65| 150| 115| 145| 120| 90| —| 90
 | 16| 1/2 – 14| 65| 130| 115| 100| 120| 90| —| 90
20| 3/4 – 14| 90| 270| 180| 145| 230| 125| —| 180
25| 1 – 11| 150| 340| 310| 260| 320| —| —| 310
 | 30| 1 1/4 – 11| 240| 540| 450| 360| 540| —| —| 450
38| 1 1/2 – 11| 290| 700| 540| 540| 700| —| —| 540

Table R2 – Assembly Torques for ISO 1179-1 / DIN 3852-2 Port
Note: Lubricate threads before assembly! Tightening torques are for steel fittings assembled in steel components. Values in chart are for steel fittings in steel ports. For stainless steel fittings, use the upper limit of torque range. For brass and aluminum decrease torque value by 35%.

Metric (ISO Thread M) Port Assembly (ISO 9974-1 / DIN 3852-1)

Series| Tube O.D.| Metric Thread M Size|

Assembly Torque Nm +10% -0

---|---|---|---
Straight Male Stud Fittings| Non-Return Valves RHV / RHZ| Banjo Fittings| Plugs VSTI-ED| Straight and Adjustable Fittings
Form A for Sealing Washer| Form B with Cutting Face| Form E with ED- Sealing| Form E with ED- Sealing| WH / TH| SWVE| Form E with ED- Sealing| O-Ring with Retaining Ring
 | 6| M 10 x 1| 9| 18| 18| 18| 18| 18| 12| 18
8| M 12 x 1.5| 20| 30| 25| 25| 45| 35| 25| 25
10| M 14 x 1.5| 35| 45| 45| 35| 55| 50| 35| 40
L| 12| M 16 x 1.5| 45| 65| 55| 50| 80| 60| 50| 55
15| M 18 x 1.5| 55| 80| 70| 70| 100| 80| 65| 70
18| M 22 x 1.5| 65| 140| 125| 125| 140| 120| 90| 90
 | 22| M 27 x 2| 90| 190| 180| 145| 320| 130| 135| 180
28| M 33 x 2| 150| 340| 310| 210| 360| —| 225| 310
35| M 42 x 2| 240| 500| 450| 360| 540| —| 360| 450
 | 42| M 48 x 2| 290| 630| 540| 540| 700| —| 360| 540
 | 6| M 12 x 1.5| 20| 35| 35| 35| 45| 35| —| 35
8| M 14 x 1.5| 35| 55| 45| 45| 55| 50| —| 55
S| 10| M 16 x 1.5| 45| 70| 70| 55| 80| 60| —| 70
12| M 18 x 1.5| 55| 110| 90| 70| 100| 80| —| 90
14| M 20 x 1.5| 55| 150| 125| 100| 125| 110| 80| 125
 | 16| M 22 x 1.5| 65| 170| 135| 125| 135| 120| —| 135
20| M 27 x 2| 90| 270| 180| 135| 320| 135| —| 190
25| M 33 x 2| 150| 410| 310| 210| 360| —| —| 310
 | 30| M 42 x 2| 240| 540| 450| 360| 540| —| —| 450
38| M 48 x 2| 290| 700| 540| 540| 700| —| —| 540

Table R3 – Assembly Torques for ISO 9974-1 / DIN 3852-1 Port
Note: Lubricate threads before assembly. Values in chart are for steel fittings in steel ports. For stainless steel fittings, use the upper limit of torque range. For brass and aluminum decrease torque value by 35%.
Metric ISO Port Assembly (ISO 6149/DIN 3852-3)

Metric Thread M Size|

Assembly Torque (+10% -0) 2)

---|---
ISO 6149-2 Stud Ends (S-Series) (Seal-Lok, EO &  VSTI-OR Plugs)| ISO 6149-3 Stud Ends (L-Series) (Triple-Lok, EO, Ferulok & Pipe Adapters)
N.m.| ft. lbs.| N.m.| ft. lbs.
M8x1| 10| 7.5| 8| 6
M10x1| 20| 15| 15| 11
M12x1.5| 35| 26| 25| 18
M14x1.5| 45| 33| 35| 26
M16x1.5| 55| 41| 40| 30
M18x1.5| 70| 52| 45| 33
M20x1.53)| 80| 59| —| —
M22x1.5| 100| 74| 60| 44
M27x2| 170| 125| 100| 74
M30x2| 235| 175| 130| 95
M33x2| 310| 230| 160| 120
M38x21)| 320| 235| 185| 135
M42x2| 330| 245| 210| 155
M48x2| 420| 310| 260| 190
M60x2| 500| 370| 315| 230

Table R4 – ISO 6149 / DIN 3852-3 Port Assembly Torques

1. M38X2 is not covered in ISO 6149 standards.
2. These torques are for steel fittings, assembled lubricated, for brass and aluminum decrease torque value by 35%.
3. For cartridge valves only.

Tapered Thread Ports

Tapered thread ports include NPT/NPTF, BSPT and metric taper. The tapered threads in these ports serve two functions: 1) to hold the fitting in place while under pressure, and 2) to serve as the primary seal. The seal for NPTF threads is created by the metal-to-metal contact between the mating roots and crests of the male and female threads. With tapered threads, there is not always contact at the roots and crests. There can be a spiralgap which is small enough for a sealant to fill and provide an effective seal.

The variety of thread forms available under taper threads include:
NPT – American Standard Taper Pipe Thread (ANSI B1.20.1).
NPTF – Dryseal American Standard Taper Pipe Thread (SAE J476, ANSI B1.20.3).
BSPT or JIS “PT” – British Standard Pipe, Tapered (BS21, JIS B 0203, ISO 7), also known as “R” for male and “Rc” for female.
M-Keg – Metric taper threads (DIN 158).
The vast majority of Parker Tube Fittings Division’s standard pipe thread fittings are machined with the NPTF thread form. NPTF thread is also referred to as Dryseal Pipe Thread.
The full thread profile contact of NPTF threads is designed to give the tapered threads self-sealing ability without thread sealant. However, variations in condition of mating threads, fitting and port materials, assembly procedures and operating conditions make self-sealing highly improbable. Therefore, some type of thread sealant is required to achieve proper seal and, in some cases, additional lubricity to prevent galling.
Types of Sealant/Lubricant
Sealant/Lubricants assist in sealing and provide lubrication during assembly, reducing the potential for galling. Pipe thread sealants are available in various forms such as dry pre-applied, tape, paste and anaerobic liquid. Pre- applied sealants, such as Vibraseal and powdered PTFE are usually applied to connectors by the manufacturer. Connectors with some of these sealants may be remade a few times without needing additional sealant. Vibraseal may also help reduce loosening due to vibration. ® PTFE tape, if not applied properly, can contribute to system contamination during assembly and installation. In addition, because of PTFE’s high lubricity, fittings can be more easily over tightened; and it does not offer much resistance to loosening due to vibration.
Paste sealants, if not applied properly, can also contribute to system contamination. Generally they can be messy to work with and some types require a cure period after component installation prior to system start up. Anaerobic liquids are available from several manufacturers and perform sealing as well as thread locking functions. They are applied to the connectors by the user and require a cure period prior to system start up. Some are soluble in common hydraulic fluids and will not contaminate the system. For proper performance they need to be applied to clean and dry components, carefully following the manufacturer’s directions.
Tapered Thread Port Assembly
The proper method of assembling tapered threaded connectors is to assemble them finger tight and then wrench tighten further to the specified number of turns from finger tight (T.F.F.T.) given in Table R5. The following assembly procedure is recommended to minimize the risk of leakage and/or damage to components.

1. Inspect components to ensure that male and female port threads and sealing surfaces are free of burrs, nicks, scratches, or any foreign material.
2. Apply sealant/lubricant to male pipe threads if not pre-applied. For stainless steel fittings, the use of Parker Threadmate sealant/lubricant is strongly recommended. (Preapplied dry sealants are preferred over other sealants). With any sealant, the first one to two threads should be left uncovered to avoid system contamination. If PTFE tape is used it should be wrapped 1-1/2 to 2 turns in clockwise direction when viewed from the pipe thread end.  Caution: More than two turns of tape may cause distortion or cracking of the port.
3. Screw the connector into the port to the finger tight position.
4. Wrench tighten the connector to the appropriate T.F.F.T. values shown in Table R5, making sure that the tube end of a shaped connector is aligned to receive the incoming tube or hose assembly. Never back off (loosen) pipe threaded connectors to achieve alignment.
5. If leakage persists after following the above steps, check for damaged threads and total number of threads engaged.

If threads on the fitting are badly nicked or galled, replace the fitting. If port threads are damaged, re-tap, if possible, or replace the component. If the port is cracked, replace the component. Normally, the total number of tapered threads engaged should be between 3-1/2 and 6. Any number outside of this range may indicate either under or over tightening of the joint or out of tolerance threads. If the joint is under tightened, tighten it further but no more than one full turn. If it is over tightened, check both threads, and replace the part which has out-of-tolerance threads.
As a general rule, pipe fittings with tapered threads should not be assembled to a specific torque because the torque required for a reliable joint varies with thread quality, port and fitting materials, sealant used, and other factors. Where many of these factors are well-controlled, such as particular jobs on an assembly floor, a torque range that produces the desired results may be determined by test and used in lieu of turns count for proper joint assembly.

Tapered Pipe Thread Size

|

T.F.F.T.

---|---

BSPT

|

NPTF

1/8-28| 1/8-27| 2 – 3
1/4-19| 1/4-18| 2 – 3
3/8-19| 3/8-18| 2 – 3
1/2-14| 1/2-14| 2 – 3
3/4-14| 3/4-14| 2 – 3
1-11| 1-11 1/2| 1.5 – 2.5
1 1/4-11| 1 1/4-11 1/2| 1.5 – 2.5
1 1/2-11| 1 1/2-11 1/2| 1.5 – 2.5
2-11| 2-11 1/2| 1.5 – 2.5

Table R5 – Assembly Turns From Finger Tight (T.F.F.T) Values For Steel, Stainless Steel and Brass Pipe Fittings

Flange Ports

Large threaded port connections, such as SAE straight thread, require very high torque to assemble. This makes assembly very difficult, especially where wrench clearance is limited. Split flange connections solve this problem by dividing the hydraulic load among four bolts each requiring much less torque, smaller wrenches and smaller wrench clearance.

There are two types of flange port connections:

1. ISO 6162
   • SAE Code 61 4-bolt split flange
   • SAE Code 62 4-bolt split flange

2. ISO 6164

The 4-Bolt Split Flange consists of four main components:

1. A body (flange head)
2. An O-ring
3.  One captive or two split flange clamps
4. Four bolts and washer

The four-bolt port is simply a circular opening (flow passage) surrounded by four tapped holes in a certain pattern for acceptance of the flange clamping bolts. The flatsurface of the port compresses the O-ring contained in the groove in the flange head when the clamp bolts are torqued. In some instances, the groove is in the port and not in the flange head. The bolts clamp down the flange head onto the flat surface of the port compressing and trapping the O-ring in the groove and leaving no  gap for it to extrude under pressure. The hydraulic pressure is thus sealed by the compressed O-ring as long as the bolts are tightened enough to maintain solid metal to metal contact between the flange head at the outside diameter of the O-ring and the top of the port.

Flange Port Assembly
The steps to properly assemble the flange port clamping bolts are:

1. Inspect components to ensure that male and female port threads and sealing surfaces are free of burrs, nicks and scratches, or any foreign material.
2. Lubricate the O-ring.
3. Position flange and clamp halves.
4. Place lock washers on bolts and insert through clamp halves.
5. Hand tighten bolts.
6. Torque bolts in diagonal sequence (see Fig. R10) in small increments to the appropriate torque level listed in Table R6 or R7 below.

Dash Size| Flange Size| Inch Bolt (J518)| +10% -0 Torque ft. lbs.| Metric Bolt (ISO 6162)|

+10% -0 Torque N-m

---|---|---|---|---|---
8| 1/2| 5/16-18| 17| M8| 24
12| 3/4| 3/8-16| 31| M10| 50
16| 1| 3/8-16| 31| M10| 50
20| 1-1/4| 7/16-14| 52| M10| 50
24| 1-1/2| 1/2-13| 77| M12| 92
32| 2| 1/2-13| 77| M12*| 92
40| 2-1/2| 1/2-13| 77| M12| 92
48| 3| 5/8-11| 155| M16| 210
56| 3-1/2| 5/8-11| 155| M16| 210
64| 4| 5/8-11| 155| M16| 210
80| 5| 5/8-11| 155| M16| 210

• Does not meet ISO 6162 specification.
  Table R6 – Code 61 Flange Recommended Bolt Torque

Dash Size| Flange Size| Inch Bolt (J518)| +10% -0 Torque ft. lbs.| Metric Bolt (ISO 6162)|

+10% -0 Torque N-m

---|---|---|---|---|---
8| 1/2| 5/16-18| 17| M8| 24
12| 3/4| 3/8-16| 31| M10| 50
16| 1| 7/16-14| 52| M12| 92
20| 1-1/4| 1/2-13| 77| M14*| 130
24| 1-1/2| 5/8-11| 155| M16| 210
32| 2| 3/4-10| 265| M20| 400

Table R7 – Code 62 Flange Recommended Bolt Torque

Socket Screw Bolt Circle (LK)| Socket Head Cap Screws|

Tightening Torques N-m

---|---|---
LK35| M6| 10
LK40| M6| 10
LK55| M8| 25

Table R8 – Hydraulic Flange Recommended Bolt Torque

• In general, variances of torque for soft metal ports/manifolds (ie: aluminum block – 66% of specified torque)

Troubleshooting Port End Connections

60° Cone (Metric, BSPP and NPSM)

CONDITION| PROBABLE CAUSE(S)|

RECOMMENDATION

---|---|---
End of swivel nut contacts hex shoulder of adapter before cone and ball nose tightens| • Wrong combination of swivel nut and adapter| •Ensure that components are to the same specification (even with the same type, there are different designs for 60° cone fittings)
Thread engagement seems adequate and swivel nut is tight but leakage still occurs| • Scratches or nicks on sealing surface

• Chatter marks on sealing surface

| • Replace components. These fittings depend on metal-to-metal seal and require smooth mating surfaces to seal
There is leakage from the joint and the swivel nut is loose| • Inadequate make-up torque| • Use proper torque to create a seal as well as prevent vibration loosening
Swivel nut tightens, cone is tight but connection still leaks| • Inadequate or no chamfer in adapter| • Use components with proper chamfer (very common occurrence with NPTF/ NPSM 60° cone fittings). Male pipe end must have chamfer for proper sealing. Not all male pipe ends have chamfer as standard

Tapered Thread (including BSPT, NPT and metric taper)

CONDITION| PROBABLE CAUSE(S)|

RECOMMENDATION

---|---|---
Thread galling| •  Most common in stainless steel, caused by friction and lack of lubricant| •  Replace fitting and apply proper thread sealant/lubricant to replacement fitting and tighten to appropriate TFFT
Fitting leaks, even after proper tightening| •  Sealant omitted or inadequately applied
•  Damaged or cracked threads
•  Cracked port
•  Thread mixing of BSPT and NPT threads| •  Re-apply sealant to appropriate TFFT and re-tighten
•  Replace fitting
•  Replace component
•  Determine port thread type and replace fitting with matching thread type
Insufficient thread engagement (3 to 6 threads of engagement required)| • Quality problem with port or adapter
•  Too much thread sealant (tape)| •  Have port and adapter thread inspected; replace faulty parts

•  Remove all thread sealant and re-apply 1 to 2 layers of tape

Too much thread engagement (more than recommended 3 to 6 threads)| • Typically port or adapter machining or wear problem, or port could be cracked due to excessive torque| •  Inspect port and adapter for proper tolerance or wear, replace faulty parts, retighten to appropriate TFFT
Poor-quality threads or damaged/nicked threads| •  Larger sizes are more prone to having nicked threads due to handling damage| •  Replace fitting with threads that are free of scratches and nicks

Parallel (SAE, BSPP and metric)

CONDITION| PROBABLE CAUSE(S)|

RECOMMENDATION

---|---|---
Washer is too loose (moves by its own weight or rocks too much on the undercut)| •  Washer damaged| •  Replace fitting
Fitting threads are distorted| •  Over-torqued
•  Mixed threads| •  Replace fitting and tighten to proper torque
•  Determine correct thread type
Several scratches or nicks on the port face| •  Port face contaminated (dirty)| •  Reface the port
Spot face of port is smaller than washer diameter| •  Improper port tool was used
•  Wrong fitting selected for port| •  Reface the port
•  Select a proper fitting
Port threads are distorted (yielded)| •  Fitting over-torqued| •  Replace component
Leakage persists after locknut has been torqued| •  Damaged O-ring
•  Damaged washer
•  Improper assembly| •  Replace O-ring with new quality O-ring (90 durometer) and reconnect fitting to proper torque
•  Replace fitting
•  Follow proper assembly procedure
Washer distorted, allowing opportunity for O-ring to extrude| •  Exposed upper thread forced washer into port during assembly (over-torquing makes this more prevalent)| •  Replace fitting, using proper installation techniques for adjustable port ends

Flange (i.e., ISO 6162 4-Bolt)

CONDITION| PROBABLE CAUSE(S)|

RECOMMENDATION

---|---|---
Missing or improper O-ring| •  Assembly/re-assembly oversight| •  Replace with proper O-ring and re-tighten connection using incremental alternating tightening procedure
O-ring pinched or extruded| •  Improper tightening procedure| •  Replace O-ring and re-tighten connection using incremental alternating tightening procedure
Evidence of yielded or cracked flange head, tube or hose end| •  Misaligned tube or hose connection| •  Re-bend or re-route hose/tube lines to eliminate misalignment
Components do not mate or gap is too large| •  Proprietary flange or pressure series matching problem| •  Properly identify all components—most proprietary flanges use standard Code 61/62 bolt patterns and threads but are not usually interchangeable
Port has severe scratches or nicks in seal area| •  Mishandling or abuse| • Resurface the port to remove scratches and nicks
Clamp halves are bent| •  Over-pressurization or over- torque| •  Replace clamp halves and tighten to proper torque
Bolts are bent| •  Bolts are too weak or over- torqued| •  Replace bolts with grade 8 or better; retighten to proper torque

Dimensions and pressures for reference only, subject to change.
Parker Hannifin Corporation
Quick Coupling Division
Minneapolis, MN
www.parker.com/quickcouplings

Documents / Resources

| Parker ST Series High Flow Unvalved Hydraulic Quick Couplings [pdf] Installation Guide
ST Series High Flow Unvalved Hydraulic Quick Couplings, ST Series, High Flow Unvalved Hydraulic Quick Couplings, Hydraulic Quick Couplings, Quick Couplings
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