JLG M450 ANSI Service Manual - Manual (Page 61)

SECTION 3 - CHASSIS & TURNTABLE
3121127 – JLG Lift – 3-21
3.7 SWING MOTOR - S/N 0300135649 TO
PRESENT
IF THE HYDRAULIC SYSTEM FLUID BECOMES OVERHEATED [IN
EXCESS OF 200°F (93.3°C)], SEALS IN THE SYSTEM CAN
SHRINK, HARDEN OR CRACK, THUS LOSING THEIR SEALING
ABILITY.
Figure 3-10. Swing Motor - Cutaway