GILLIG LOW FLOOR, Service Manual

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Hydraulic System
38
HyDRAULIC SySTEM RESERVOIR
The reservoir contains a filter and screen to keep foreign matter and dirt from entering either the pump,
the fan motor, or the steering gear.
The hydraulic fluid must be checked daily for proper level and
cleanliness, just as are the engine and transmission lubricating and
cooling fluids. DO NOT use motor oil of any specification in the
hydraulic system.
The reservoir is mounted in the right rear corner of the coach, in the engine compartment.
Hydraulic Fluid Replacement
Hydraulic fluid should be replaced according to the intervals given in the Preventive Maintenance chap -
ter of this manual. Follow the recommendations of the “Fluid Specifications” section of this manual’s
Specifications chapter.
To drain the hydraulic fluid, disconnect the suction hose (the largest hose, size #20 or #24), and drain
from the bottom of the reservoir. Removing other hoses throughout the hydraulic system in order to
drain all of the hydraulic fluid in the system is not necessary, and it can cause air go get into the steering
gear.
When adding fluid to the reservoir, secure a 200 mesh wire screen inside a funnel and pour the fluid into
the reservoir through the dipstick/filler cap opening.
Check the fluid level by removing the dipstick attached to the filler cap. Wipe the dipstick and reinsert it
into the reservoir. Remove the dipstick a second time and observe the level indicated. If the level ob-
served is between the “FULL” and “ADD” marks, there is adequate and sufficient fluid in the system. If
the fluid level gets below the “ADD” mark (for over 5 seconds), the low-fluid sensor in the reservoir will
cause the “LOW FLUID (TRANS)” indicator lamp on the indicator lamp strip above the dash to light.
Filter Element Replacement
The filter inside the hydraulic system reservoir should be replaced according to the intervals given in the
Preventive Maintenance chapter of this manual. To change the filter element, do the following:
1. Wipe the reservoir cover exterior surface clean of dirt or other foreign matter.
2. Remove the two bolts and the clamp band which secures the reservoir cover to the body (Figure
8-6).
3. Lift the top of the reservoir off. Remove the retainer, spring, and wing nut securing the old filter
element. Wipe the interior of the reservoir cover clean with a lint free cloth.
4. Install a new element, then install the retainer, spring, and wing nut to secure the element.
5. Reinstall the cover, clamp band, and bolts, washers, and nuts. Tighten the nuts to 12–18 ft-lb
(16–24 N-m) torque.
6. Fill and bleed the hydraulic system as described in “Bleeding the Hydraulic System” later in this
chapter.