OM4016 08/07 Maintenance - Section 4 Lubrication and Service Page 4-17 HIGH PRESSURE HYDRAULIC FILTERS Filter Assembly Removal 1. Lower the dump body and shut down the engine. Clean dirt accumulation from the high pressure hydraulic filters and tube connections in front of the hydraulic tank. Release hydraulic tank filler cap slowly to remove any internal pressure. Hydraulic fluid escaping under pressure can have sufficient force to enter a person's body by penetrating the skin and cause serious injury and possibly death if proper medical treatment by a physician familiar with this injury is not received immediately. 2.
Turn the oil filler caps (3 & 8, Figure 4-3) slowly counterclockwise to release internal tank pres- sure. 3. Place a receptacle under the filters to receive hydraulic oil which will drain from filters when disconnected. FIGURE 4-6. HIGH PRESSURE FILTERS & PIPING 4. Remove capscrews (1, 4, & 8, Figure 4-6), washers (2, 5, & 9), and split flanges (10) secur- ing filters (7). 1. Capscrew 2. Washer 3. O-Ring 4. Capscrew 5. Washer 6. U-Bolt 7. Filter Assembly 8. Capscrew 9. Washer 10. Split Flange 11. Bracket (on Hydraulic Tank) 12. Washer 13. Nut Move hydraulic tubes away from filter housings. 5. Remove nuts (13) and washers (12) holding U- bolts (6) to bracket (11).
Remove filter assem- blies (7). Discard O-rings (3). Plug or cover all open hydraulic connections to prevent entry of contaminants and move filter assemblies to a clean service area. 4. Carefully align all components and connections to prevent any binding or kinking and then begin tightening all capscrews and nuts sequentially to final standard torque. Filter Assembly Installation 1. Remove plugs and/or covers from connections. Install new O-rings (3, Figure 4-6) in all loca- tions. Install filter assemblies (7) to outlets and install capscrews (1 & 4), washers (2 & 5). Do not tighten capscrews to final torque at this time.
Tighten all connections before starting engine and applying hydraulic pressure. 2. Move hydraulic tubes to filter housings inlets and reconnect with capscrews (8), washers (9), and split flanges (10). Do not tighten capscrews to final torque at this time. 5. Start engine and check for leaks before releas- ing truck for service. Check hydraulic tank oil level; oil must be visible in sight glass (4, Figure 4-3). 3. Install U-bolts (6) holding filter assemblies (7) to bracket (11). Install washers (12) and nuts (13). Do not tighten nuts to final torque at this time.