Stanley Black & Decker DH9000 User Manual

DH USER MANUAL   13  

Check the chain adjustment bolts and secure the nuts if 

required. 

Check the Housing Cover plate bolts and tighten if needed. 

Check the hydraulic hoses, fittings and valves for any leaks 

and repair as required. 

With the machine turned off, oil the chain over the top sprocket 

with a heavy duty gear oil such as Mobil Gear 600 Series. 

Refer to the table below for recommended chain oil.

Ambient Temperature

Lubricant Rating (SAE)

Viscosity Grade 

(Hydraulic Fluid)

23° - 41°F / -5° - +5°C

20

46 - 68

41° - 104°F / 5° - 40°C

30

100

104° - 122°F / 40° - 50°C

40

150 - 220 

122° - 140°F / 50° - 60°C

50

320

With the drop hammer in a vertical position and the carrier 

turned off remove the Housing Cover plate. Check the chain 

tension. The chain should move about 1/2 inch/10-15 mm at 

its center point. To adjust the chain, loosen the Tensioning 

Bolt lock nuts (Item 32 DH1500 or Item 30 DH3500) and the 

Clamp Nut (Items 41-42 DH1500 or Items 34-35 DH3500). 

Adjust  the Tension  Bolts  evenly  (so  that  the  lower  shaft/

sprocket are kept parallel).  See Figure 4 below.

Figure 4. Lower Sprocket Assembly

Remove the rubber inspection cover at the top of the drop 

hammer and check that the motor nut is tight. Replace the 

inspection cover. 

Lower 

Sprocket

Shaft

Bearing

Nut

Washer

Hex Head Setscrew

(Long)

Hex Head Setscrew

(Short)

Washer

Nut

Bearing

Washer

Half Nut

Nut

Adjuster 

Bracket

Sprocket

Spacer

Standing clear of the machine, start the drop hammer and 

SLOWLY rotate the chain until the chain Connecting Plate 

Assembly is accessible. Turn the carrier off and disconnect 

hydraulic hoses.

Check this assembly for signs of excessive wear, and replace 

as required. 

Lubricate this assembly and the chain. Refer to the table on 

the previous page.

Replace the Housing Cover.

 

Tip the drop hammer forward and slide the weight out as 

described Adjusting Impact section of this manual.

Inspect the Hammer Connecting Pin and replace if excessively 

worn. 

Liberally grease the Hammer Connecting Pin USE A LITHIUM 

BASED GREASE WITH NGLI 1 or 2 RATING (Mobilgrease 

HP or Shell Alvania EP) and replace the hammer as described 

in Adjusting Impact section of this manual. 

It is worthwhile at this stage to dress the hammer tip and 

remove any excessive burring. 

1. Ensure the travel lock is installed before transporting the 

drop hammer.