-15-
142646 - Strawmaster PRO (21-June-2018)
PREPARATION
When cylinder repair is required, clean off unit,
disconnect hoses and plug ports before removing
cylinder.
When removed, open the cylinder ports and drain the
cylinder's hydraulic fl uid.
Examine the type of
cylinder. Make sure
you have the correct
tools for the job.
You may require the
following tools:
•
Proper
Seal Kit
•
Allen Key Set
•
Emery cloth
•
Torque Wrench
Set Screw
Threaded
Head
Threaded Head Cylinder
(Monarch)
REPAIRING A THREADED HEAD CYLINDER
Barrel
Rod
Assembly
Lock
Nut
Gland
End
Cap
Set Screw
Piston
Seal
Dual Seal
Wiper
Seal
U-Cup
Seal
Wear
Ring
Wear Ring
Piston
DISASSEMBLY
1. Loosen Set Screw and turn off end cap.
2. Carefully remove piston/rod/gland assemblies.
3. Disassemble the piston from the rod assembly
by removing lock nut.
NOTE
:
DO NOT
clamp rod by chrome surface.
4. Slide off gland assembly & end cap.
5. Remove seals and inspect all parts for damage.
6. Install new seals and replace damaged parts with
new components.
7. Inspect the inside of the cylinder barrel, piston, rod
and other polished parts for burrs and scratches.
Smooth areas as needed with an emery cloth.
REASSEMBLY
1. Reinstall rod through end cap & gland assembly.
2. Secure piston to rod with lock nut. Torque lock nut
to proper value (refer to chart for proper torque
value).
3. Lube inside of barrel, piston seals, and gland seals
with hydraulic oil.
4. With cylinder body held gently in a vise, insert
piston, gland, end cap and rod combination using
a slight rocking motion.
5. Apply Loctite anti-seize before installing cylinder
end cap.
6. Torque cylinder end cap to 440 lb.ft (600 N.m).
7. Tighten Set Screw on end cap to 6 lb.ft (8 N.m).
Set Screw Style
HYDRAULIC CYLINDER REPAIR
LOCKNUT SIZE
(PISTON)
TORQUE VALUE
3/8 - 24 UNF
25-30 lb.ft (35-42
N.m
)
1/2 - 20 UNF
40-60 lb.ft
(55-80 N.m)
5/8 - 18 UNF
95-105 lb.ft (130-140
N.m
)
3/4 - 16 UNF
175-225 lb.ft
(240-305 N.m)
7/8 - 14 UNF
200-275 lb.ft (270-370
N.m
)
1 - 14 UNF
300-380 lb.ft
(405-515 N.m)
1 1/8 - 12 UNF
400-500 lb.ft (540-675
N.m
)
1 1/4 - 12 UNF 500-600 lb.ft
(675-810 N.m)
1 1/2 - 12 UNF
700-800 lb.ft (950-1085
N.m
)
1 3/4 - 12 UNF 800-900 lb.ft
(1085-1220 N.m)
O.D. Threads =
Locknut Size
CYLINDER ROD LOCKNUT TORQUE VALUES
Service & Maintenance