Group 34, Uprights
34-5-6 • Cylinder Removal, Shimming, Overhaul, and Replacement SM 765, Nov ’06
5. Insert the piston and rod into the cylinder. Be careful
not to scratch or damage the cylinder gland nut
threads.
6. For primary cylinders, add 3.4 oz (100 ml) of hydrau-
lic oil into the cylinder on the rod side of the piston.
7. Install the lock ring onto the gland. Lubricate cylin-
der threads and screw gland onto cylinder. Be careful
not to damage gland seal. Make sure the gland is
fully seated on the cylinder barrel. Deform the lock
ring into slots in the tube and the gland.
8. Check the assembly by making sure the piston slides
freely in and out of the cylinder.
9. Tighten the gland nut:
• On primary cylinders, tighten the gland nut to 135
N⋅m (100 ft-lb).
• On lift and secondary cylinders, tighten the gland
nut to 100 N⋅m (75 ft-lb).
This competes the cylinder repair procedure. Replace the
cylinders as described in “Cylinder Removal and Replace-
ment.” Complete the chain length adjustment in Section 3
for correct carriage and rail position. When all adjust-
ments are completed, return the truck to service.
Hi-lo Upright Lift and TSU
Secondary Cylinder
Hi-lo and Triple-Stage Upright
Typical Piston-Type Standard
Secondary Cylinder
Primary Cylinder
Upright Lift and TSU
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