Pump Component LOCA- Tions Models 72620

Service and Maintenance

5.10HYDRAULIC FLUID (MODELS 72620 & 74824)

Handle pressurized hydraulic fluid carefully. Escaping pressurized hydraulic fluid can have sufficient force to penetrate your skin causing serious injury. This fluid may also be hot enough to burn. Serious infection or reactions can develop if proper medical treatment is not administered immediately.

Premium hydraulic fluids containing high quality rust, oxidation, and foam inhibitors are required. These include premium turbine oils, API CD engine oils per SAE J183, M2C33F or G automatic transmission fluids meeting Allison C-3 or Caterpillar TO-2, and certain specialty agricultural tractor fluids.

5.12HYDROSTATIC PUMP START UP PROCEDURE (MODELS 72620 & 74824)

Follow this start-up procedure when starting a new installation or when restarting an installation in which the hydrostatic pump has been removed from the system.

1.Before starting the hydrostatic pump, make sure all system components (reservoir, fittings, etc.) are clean.

2.Fill the reservoir with recommended hydraulic fluid, which should be filtered before entering the reservoir.

3.The inlet line leading from the reservoir to the charge pump must be filled before start-up. Loosen the fitting on this inlet line until oil bleeds out.

5.11PUMP COMPONENT LOCA- TIONS (MODELS 72620 & 74824)

Fig. #9

WARNING

Do not start engine unless pump is in neutral position on the cable.

4.Start the engine and run at the lowest possible RPM.

5.As air is purged from the unit, the oil level in the reser- voir will drop and bubbles may appear in the fluid. Refill the reservoir as necessary.

6.Run the unit and move the control arm in both direc- tions for several minutes until any remaining air is purged from the unit. Refill the reservoir as necessary.

7.Check to ensure feed roller stops when control arm is in the neutral position. Adjust the cable clevis or anchor if the feed roller doesn't stop.

NOTE

A motor fitting may have to be loosened and oil bled to remove air from the system (use same procedures as steps 3-5).

8.Shut down the engine, check for and correct any fluid leaks, and check the reservoir level. Add fluid if neces- sary. The hydrostatic pump is now ready for operation.

NOTE

Hydrostatic pressure controlled by the crossover relief valve is factory set at 1750 PSI.

Page 14

6" & 8" Bear Cat Chipper Operator’s Manual

72620, 71620, 74824 specifications

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