4
Check surface of plunger (36) for damage.
A worn plunger (36) must be removed (27 mm
wrench) and replaced. Due to reasons of precision,
the ceramic plunger alone cannot be exchanged.
Coat the threads of the plunger lightly with an
appropriate bonding agent and tighten plunger to the
required torque.
Check the leakage bores ø4mm of the seal
sleeves (39/39A) and seal cases (38) for dirt
and clean if necessary.
The elbow screw-in joints (70/71) and elbow pipes
(72) must also be checked for dirt and cleaned if
necessary.
For the right sealing sleeve, the leakage hole
ø4 mm must be closed by a nozzle (39B) to
improve water circulation from sealing sleeve
1 to sealing sleeve 3.
Fit the drip-return unit (46/47/48), the high-pressure
seal unit (41/42/43/44) and tension spring (40) into
the seal sleeve.
Then push the assembled seal sleeves (39/39A)
carefully on to the plungers and into the drive;
thereafter, mount elbow pipes (72) as per the
exploded view and tighten the screw-in joints
(70/71) carefully.
Push the valve casing (54) with the seal sleeves
(38) onto the sealing sleeves (39/39A).
Tighten the screws (58) for fastening the valve
housing evenly to the specified torque.
If required, supplementary assembly
instructions can be requested from the
manufacturer Giant.
8. Materials Used
Valve Casing: AISI CA-6-NM
Plunger:
AISI 329 hard metal coated
Valves:
Duplex-Steel / 1.4460 / 1.4462
Seals:
Aramid Packing with Teflon
O-Rings: Nitrile
9. Paint
The pump drive is painted in RAL 3001 as
standard.
GP7622 TORQUE SPECIFICATIONS
Position
Item #
Thread
Description
Lubrication Info
Torque Amount
1
05769
Crankcase
Molycote Cu-Paste
5
05798
Seal for Crankcase Cover
Loctite 5910
10
22706
M10
Hexagon Screw
33 ft.-lbs. (45 Nm)
12
07109
1/2” BSP
Drain Plug
30 ft.-lbs. (40 Nm)
15
05771
Radial Shaft Seal
Loctite 403
17
05642
M12
Hexagon Socket Screw
33 ft.-lbs. (45 Nm)
24
05770
M10
Connecting Rod Assembly
22 ft.-lbs. (30 Nm)
32
07624
Radial Shaft Seal
Loctite 403
36
06748
27mm
Plunger
33 ft.-lbs. (45 Nm)
38
03452
Seal Sleeve
Copper Paste/
Crankcase outside
58
03464
M16
Hexagon Socket Screw
173 ft.-lbs. (235 Nm)
60
04061
Plug, 1/2” BSP
Anti Seize 350
63
05373
Plug, 1/2” BSP
Anti Seize 350
64
12249
Plug, 1” BSP
Anti Seize 350
69
03141
Connection Nipple
Anti Seize 350
