Caterpillar — Installation of two-piece seal into slack adjuster piston (209-6381 Seal Installer Group)
Maintenance · Slack adjuster piston assembly (205-0561/205-0567)
From a Caterpillar manual covering: 3304, 561C, 623E, 623H, 725, 735, 740, 740B Ejector, 773, 793, 977H, CX31…. Check it applies to your exact model before use.
Applies to: Caterpillar 3304, Caterpillar 725, Caterpillar 735, Caterpillar 740, Caterpillar 773, Caterpillar 793
Procedure
- Place 207-3440 Loading Mandrel over small piston.
- Place inner portion of two-piece seal onto mandrel and push onto piston using 207-3442 Ring Pusher. Repeat for outer portion of seal.
- With both sets of seals installed, push piston assembly into 207-3444 Seal Sizer.
- Allow seals to compress for one minute and then install small piston into large piston.
Tools required
- 207-3440 Loading Mandrel Amazon
- 207-3442 Ring Pusher Amazon
- 207-3444 Seal Sizer Amazon
- 8F-8178 Bolt Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Full service-parts list: Caterpillar 3304 →, Caterpillar 725 →, Caterpillar 740 →
Source: Caterpillar manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.