MAINTENANCE CD15 OPERATOR MANUAL
6-28 Published 3-30-2018, CTRL 636-05
5. Place a suitable container under the hydraulic tank drain
plug (Figure 6-37).
6. Remove the drain plug and drain the hydraulic tank.
7. Install the drain plug.
If the oil/tank is extremely dirty, the tank can be flushed
and cleaned by removing the cleanout cover from the
top of the tank. It will be necessary to remove the deck
plate to perform this step.
8. Replace the hydraulic oil filter.
9. Remove the breather and fill the hydraulic tank with the
proper type and amount of oil (specified in Section 8 of
this manual) to 3 mm (0.125 in) from the top of the sight
gauge.
10. Discard the breather and install a new one.
11. After the tank is filled, start the engine and operate each
function until all of the cylinders and lines are filled.
12. Fully retract and lower the boom and retract the
outriggers. Check the hydraulic oil level. The oil must be
3 mm (0.125 in) from the top of the sight gauge. Add
hydraulic oil if necessary.
13. Visually check for leaks.
Replace the Hydraulic Oil Filter
1. Replace the hydraulic filter element (Figure 6-38) when
the service indicator is in the red area.
2. Engage the parking brake and stop the engine.
NOTE: It is necessary to climb under the crane to replace
the hydraulic oil filter. Be sure engine is off, the
ignition key is removed, and chock blocks are in
place before climbing under the crane.
3. Locate the hydraulic oil filter under the crane.
4. Place a suitable container under the filter to catch oil.
5. Replace the filter element:
a. Using a wrench, turn the filter bowl off the head.
8957-1
Hydraulic Tank Drain Plug
FIGURE 6-37
Fuel Tank Drain Plug
Hydraulic Tank
Sight Gauge
Hydraulic Tank
Breather/Fill Cap with
Mesh Strainer
Hydraulic Tank Cleanout
Cover (under deck plate)
8957-2
8958
Hydraulic Filter
FIGURE 6-38
Filter Bowl
Filter
Head
Service
Indicator
Filter Bowl
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