JLG 1230ES Service Manual - Manual (Page 113)

SECTION 6 - MAST COMPONENTS
3121222 – JLG Lift – 6-13
6.8 MULTI-STAGE HYDRAULIC CYLINDER - SERVICING
Refer to Section 3.6, PUMP/LIFT/MAST - Theory of Operation for more detailed information on Hydraulic System.
Overview
The hydraulic cylinder for this machine is a multi-stage - three cylinder design.
Figure 6-15. 1230ES Lift Cylinder Internal Components - Top End
1. Cyl. #3 - Gland
2. Cyl. #3 - Wiper Seal
3. Cyl. #3 - Main Seal
4. Cyl. #3 - Gland Wire Retaining Ring
5. Cyl. #3 - Gland O-Ring Seal
6. Cyl. #1 - End Cap (a) 7. Cyl. #1 - Piston Retaining Ring
8. Cyl. #1 - Piston
9. Cyl. #1 - Piston Guide Ring
10. Cyl. #1 - Piston Damping Spring
11. Cyl. #1 - Rod Guide/Spacer