BobCat E35 – CYLINDER (BOOM) (S/N A93K13095 & BELOW, AC2P13031 & BELOW) – Assembly

Clean all parts in solvent and dry with compressed air.

Inspect the cylinder parts for wear or damage. Replace any worn or damaged parts.

Always install new O-rings and seals.

Lubricate all O-rings and seals with hydraulic oil during installation.

Use the following tools to assemble the cylinder:

MEL1396 – Universal Seal Expander
MEL1033 – Rod Seal Installation Tool
MEL1396-2 – Piston Ring Compressor
MEL1075 – Adjustable Gland Nut Wrench
MEL1075-1 – Standard Pins

Install the new seal on the tool and slowly stretch it until it fits the piston [Figure 20-21-24].

Allow the seal to stretch for 30 seconds before installing it on the piston.

Install the seal (Item 1) [Figure 20-21-25] on the piston.

Use a ring compressor to compress the seal to the correct size. Leave the piston in the compressor for approximately three minutes [Figure 20-21-26].

Install the rod seal on the rod seal tool [Figure 20-21-27].

NOTE: During installation the spring side of the seal must be toward the inside of the cylinder.

Rotate the handles to collapse the rod seal [Figure 20-21-27].

Install the rod seal in the head [Figure 20-21-28].

Install the wiper seal with the wiper (Item 1) [Figure 20-21-29] toward the outside of the head.

Install the wear ring (Item 1) [Figure 20-21-30].

Install the O-ring (Item 1) [Figure 20-21-31].

Install the seal (Item 2) [Figure 20-21-31].

Install the head onto the rod.

Install the piston (Item 1) and nut (Item 2) [Figure 20-21-32].

Grease the piston where the nut contacts the piston. Do not get grease on the threads.

Provide an adequate support for the cylinder before tightening.

NOTE: Clean and dry the rod threads. Install a NEW NUT with pre-applied Loctite®.

Tighten the nut to 1491 N•m (1100 ft-lb) torque.

Install O-ring (Item 1) and plug (Item 2) [Figure 20-21-33].Tighten the plug to 50 N•m (37 ft-lb) torque.

Put the base end of the cylinder in a vise.

Insert the adjustable gland nut wrench into the holes (Item 1) [Figure 20-21-34] to tighten the head. Tighten the head to 367 N•m (250 ft-lb) torque.

Install the bushing and seal (Item 1) [Figure 20-21-35] on both sides of the cylinder base end.

Install the bushing and seal (Item 1) [Figure 20-21-36] on both sides of the cylinder rod end.


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