Peninsular Cylinder MH Series Setup guide

27650 Groesbeck Highway * Roseville, Michigan 48066-2759
[phone] * [phone] * Fax: [phone]
www.Peninsularcylinders.com Email: [e-mail]
PENINSULAR
CYLINDERCO.
®
REL 4/20/04 REV 8/01/07
ISO
9001:2000
Registered
Cylinder Maintenance & Repair Instructions
Model MH & Model LM Pneumatic Cylinders
Proximity Switch & Non –Proximity Switch Designs
Model MH Air Cylinder - NFPA, Heavy-Duty Steel, Prelubricated for Life
Model LM Air Cylinder - NFPA, Medium-Duty Aluminum, Prelubricated for Life

Cylinder Maintenance and Repair Instructions
Model MH & Model LM Pneumatic Cylinders
Please refer to the Cylinder Parts List drawing and related charts when performing
maintenance on a cylinder.
ROD CARTRIDGE SEALS
To replace the Rod Cartridge Seals:
1. Remove the Rod Cartridge Retainer Screws (items 12). Normally, the Tie Rod Nuts(items 21)
DO NOT have to be loosened to replace the Rod Seal (item 3) and the Rod Wiper Seal (item 2)
unless the cylinder is supplied with a "Tie Rod Retained Cartridge".
2. Remove the Rod Cartridge Retainer (item 13).
3. Remove the Rod Bearing Cartridge (item 1) from the Front End Cap (item 14) by pulling straight
out while twisting slightly.
4. Remove the Rod Wiper Seal (item 2), the Rod Seal (item 3) and the Rod Cartridge O-Ring Seal
(item 4). It is very important to note the orientation of the Rod Wiper Seal (item 2) and the Rod
Seal (item 3) in the seal grooves. The new seals must be oriented the exact same way during
replacement.
5. Clean the Rod Bearing Cartridge (item 1) and inspect for it for excessive wear or scoring.
Replace the Rod Bearing Cartridge if necessary.
6. Install a new Rod Wiper Seal (item 2), Rod Seal (item 3), and Rod Cartridge O-Ring Seal (item
4) into the Rod Bearing Cartridge (item 1). Coat the I.D. of the Rod Bearing Cartridge (item 1)
with Acrolube grease.
7. Check the Piston Rod end (item 11) for burrs in the thread areas and wrench flats. Remove and
polish sharp edges as required.
8. Install the reassembled Rod Cartridge Assembly over the Piston Rod end (item 11) with a slight
twisting motion. Push the Rod Cartridge Assembly into the bored cavity in the Front End Cap
(item 14).
9. Install the Rod Cartridge Retainer (item 13) and torque the Rod Cartridge Retainer Screws (items
12) to the values in our torque table.
TUBE END SEALS
To replace the Tube End O-Ring Seals:
1. Remove the Tie Rod Nuts (items 21). It may be helpful to grip the Tie Rods (items 18) with Vise
Grip Pliers to prevent the Tie Rods from twisting.
2. Remove the Front End Cap (item 14) and the Rear End Cap (item 20) from the cylinder.
3. Remove the old Tube O-Ring Seals (items 7) and clean the Front and Rear End Cap seal
grooves thoroughly.
4. Install new Tube O-Ring Seals (items 7) into the Front and Rear End Caps (items 14 & 20). A
small amount of grease on the O-Ring may be helpful to hold it in place during assembly. It is
very important that the O-Ring is fully seated in the seal groove.
5. Re-assemble the Front and Rear End Caps (items 14 & 20) to the Cylinder Tube (item 15) being
careful not to pinch the O-Rings.
6. Hand tighten the Tie Rod Nuts (items 21) while making sure the Front and Rear End Caps (items
14 & 20) are square to the Cylinder Tube (item 15). Assembling the cylinder on a flat surface is
helpful to assure proper alignment of the Front and Rear End Caps.
7. Torque the Tie Rod Nuts (items 21) in the order and values shown in the torque chart. Gripping
the Tie Rods (items 18) with Vise Grip Pliers may be helpful to avoid twisting the Tie Rods during
tightening.

PISTON SEALS
To replace the Piston Seals:
1. Remove the Tie Rod Nuts (items 21), the Tie Rods(items 18) and the Front and Rear End Caps
(items 14 & 20). See instructions 1 & 2 under "Tube End Seals".
2. Pull the Piston and Rod Assembly from the Cylinder Tube (item 15).
3. Remove the Piston U-cup Seals (items 10) from their grooves in the Piston (item 17) with a brass
or plastic tool (avoid any tools which might damage the seal groove surfaces).
4. Remove the Wearband (item 9) and inspect it for wear and replace if necessary. The Wearband
(item 9) is split and snaps into the middle groove on the Piston (item 17).
5. Clean the Piston (item 17) and Cylinder Tube (item 15) with suitable solvent. Blow dry with
compressed air. Inspect parts for wear or scoring and replace if necessary.
6. Fill the Piston’s Lubrication Cavity below the Wearband (item 9) with Acrolube grease.
7. Install two new Piston U-cup Seals (items 10) on to the Piston (item 17). IMPORTANT:the Lips
on the seals must face the direction of the air pressure within the cylinder (See the illustration for
proper seal orientation). Lightly coat the seals and tube I.D. with Acrolube grease.
8. Install the Piston Assembly into the Cylinder Tube (item 15) being careful to avoid damage to the
Piston U-cup Seals (items 10).
9. Re-install the Front and Rear End Caps (items 14 & 20) and the Tie Rods (items 18). Tighten the
Tie Rod Nuts (items 21) following instructions 6 & 7 under "Tube End Seals".
CUSHION SEALS & CUSHION ADJUSTING SCREW
To replace Cushion Seal Inserts or Cushion Adjusting Screw O-ring:
1. The Cushion Adjusting Screw (item 6) or its sealing O-Ring (item 5) may be replaced without
dismantling the cylinder.
2. Unscrew the Cushion Adjusting Screw (item 6) by it turning counter clockwise.
3. Inspect the Cushion Adjusting Screw tip and O-Ring seal. Replace if parts are damaged.
4. Install new O-Ring (item 5) on to the Cushion Adjusting Screw (item 6). Lubricate the O-Ring with
grease and reinstall the Cushion Adjusting Screw into the Front and /or Rear End Caps (items 14
& 20). To replace the Cushion Seal Inserts(items 8), the Front and /or Rear End Caps (items 14
& 20) must be removed. Follow the instructions under "Tube End Seals" 1 & 2. Once the Front
and /or Rear End Caps are removed the Cushion Inserts (items 8) may be replaced by pulling
them out of the Cushion Insert bores. Clean out the Cushion Insert bores and install new
Cushion Inserts by simply pushing them into the bore.
PISTON
To remove Piston from Piston Rod:
1. The Piston Rod (item 11) and Piston (item 117) are assembled at the factory with a high strength
locking sealant.
2. Remove the Piston Rod Assembly from the cylinder (see instructions 1 through 3 under "Piston
Seals"). Remove the Piston U-cup Seals (items 10) and the Wearband (item 9) from the piston.
3. Heat the Piston and Rod Assembly to 400 degrees -450 degrees Fahrenheit.
4. Disassemble the Piston from the Rod while hot. Use a spanner wrench to remove the Piston
from the Piston Rod.
5. Clean threads with solvent and bristle brush. Blow dry with compressed air.
6. Apply "Loctite" sealant #277 or equivalent to threads of the Piston Rod. Assemble and torque to
specifications (see torque chart). Allow the sealant to cure for 30 minutes before operating the
cylinder.

5
2
107 7
1. (1) Rod Bearing Cartridge 12. (4) Rod Cartridge Retainer Screws
2. (1) Rod Wiper Seal 13. (1) Rod Cartridge Retainer
3. (1) Rod Seal 14. (1) Front End Cap
4. (1) Rod Cartridge O-Ring Seal 15. (1) Cylinder Tube
5. (2) Cushion Screw O-Ring Seals 16. (1) Cushion Hub -Front End Cap
6. (2) Cushion Adjustment Screws 17. (1) Piston
7. (2) End Cap to Tube O-Ring Seals 18. (4) Tie Rods
8. (2) Cushion Seal Inserts 19. (1) Cushion Hub -Rear End Cap
9. (1) Piston Wear Band 20. (1) Rear End Cap
10. (2) Piston U-Cup Seals 21. (4) Tie Rod Nuts
11. (1) Piston Rod
3
4
5
1
Model MH Cylinder shown:
8 89
11
12
14 13
20
21
15
17
19
16
18
6 6
Model MH & Model LM Pneumatic Cylinder Parts List

27650 GROESBECK HWY.ROSEVILLE, MI. 48066–2759
PH 586.775.7211 FAX [phone]
http://www.peninsularcylinders.com
01-21-03
TIE ROD & SOCKET HEAD CAP SCREW TORQUE VALUES
THREAD SIZE TORQUE (FT. LBS.)
10-32 2.5
1/4-28 6.5
5/16-24 12
3/8-24 22
7/16-20 35
1/2-20 55
5/8-18 110
3/4-16 185
7/8-14 300
1
1
2
4
32
TIE ROD TORQUE PATTERN
FASTENER TORQUE INSTRUCTIONS:
Tighten tie rod nuts & retainer nuts
in pattern shown at the right and to
torque values in Table 1.
Use MoS2 grease or equivalent on
both the threads and bearingsurface.
Should lubricant not be available,
torque values should be increased by 50%.
TABLE 1
FIGURE 1