Strong GR4 Procedures Manual page 17

reel drive. The other circuit powers the material pump (on hydrostatic units). The flow of oil is
controlled by a series of hydraulic valves.
When trouble in the hydraulic system exists, it is usually accompanied by excessive heat. The major
sources of trouble are worn parts in the pump and/or motor causing excessive slippage and heat, oil too
thin and breaking down causing excessive slippage, and worn valves parts or broken "O" Rings causing a
by-pass. To find where trouble exists in a system, see the Trouble Shooting section that follows.
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