HARBEN 903-1315, Operation & Maintenance Manual

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10.6. To Dismantle
1. Unscrew the four M8 bolts (4) and remove cylinder (3) (DRG 026-111).
2. Unscrew the three M8 cap head screws (17) (DRG 035-255) and remove the adaptor
(2) (DRG 026-111) from the water valve body (18) (DRG 035-255)
3. Remove the spring cap (8) from water valve body (18) (DRG 035-255)
4. TO DISMANTLE THE SPRING PACK: Using a vice fitted with soft jaws and small dia
bar, approx. 5mm, compress the spring mount (6) and disc springs (1) into the cap (8)
and remove circlip (2) (DRG 035-255)
5. Place drift 033275 over spindle (12), tap end of drift gently and remove internal water
valve parts. Keeping all parts in order, separate out the spindle stack and remove seals
(4), (3) & (15) and scraper (7) (DRG 035-255).
10.7. To Assemble
1. Check all parts for burrs, swarf, and damage, then clean thoroughly and lay
components out on a clean area.
2. Gently ease both step seals (4) into glands (11) making sure step of inner seal faces
pressure (DRG 035-255)
3. Gently ease both Glyd rings (3) into end collars (10) making sure stepped side of inner
seal is visible when fitted (DRG 035-255)
4. Fit center collar (9) between the two end collars (10). This may be a slide, or a light
press fit into the collars (DRG 035-255)
5. Holding glands (11) against end collars (10) with step seals facing end collar, gently
push lightly oil spindle (12) right the way through internal bore of stack until spindle
(12) stops up against face of gland (11) (DRG 035-255)
6. Fit four O-rings (15) to items (10) and (11) (DRG 035-255)
7. Slide scraper (7) over end of spindle (12) (DRG 035-255)
8. Lightly grease O-rings (15), and gently push the complete spindle stack into the water
valve body (18). It may be necessary using a Delrin rod to gently tap, evenly and
squarely, the spindle stack into the body (18) (DRG 035-255)
9. Stack disc springs (1) onto the spring mount (6) as shown on the (DRG 035-255) and
grease the complete stack.
10. Fit the greased spring stack into cap (8) and using a vice fitted with soft jaws and a
small diameter bar, approx. 5mm, compress the spring mount (6) and disc springs (1)
into the cap (8) bore enough to enable the circlip (2) to be fitted in groove on the wall
of cap (8). Then pressure can be gently released and spring mount (6) will stop against
circlip (2) (DRG 035-255)