JLG 740AJ, Service And Maintenance Manual

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SECTION 5 - BASIC HYDRAULIC INFOR M ATION AND SCHE M ATICS
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SECTION 5. BASIC HYDRAULIC INFORMATION AND SCHEMATICS
5.1 LUBRICATING O-RINGS IN THE HYDRAULIC
SYSTEM
When assembling connectors in the hydraulic that use o-ring
fittings, it is necessary to lubricate all fittings with hydraulic oil
prior to assembly. To lubricate the fittings, use one of the fol-
lowing procedures.
NOTE: All o-ring fittings must be pre-lubricated with hydraulic oil
prior to assembly.
Cup and Brush
The following is needed to correctly oil the o-ring in this man-
ner:
• A small container for hydraulic oil
• Small paint brush
1. Hold the fitting in one hand while using the brush with
the other hand to dip into the container. Remove excess
hydraulic oil from the brush so an even film of oil is
applied on the o-ring.
2. Holding the fitting over the hydraulic oil container,
brush an even film of oil around the entire o-ring in the
fitting, making sure the entire o-ring is completely satu-
rated.
3. Turn the o-ring on the other side of the fitting and
repeat the previous step, ensuring the entire o-ring is
coated with hydraulic oil.